PAK KASHMIR - ISP

How To watch youtube Video without proxy on playit.pk

noreply@blogger.com (Anonymous) — Sat, 01 Feb 2014 20:51:00 +0000

Search your desired video on google.com
and follow the instruction image below

Then open playit.pk website and follow the instruction below

And know you can watch your desired youtube.com video here on playit.pk
you can also download the video at many quality to do this follow the instruction bellow

This is the final step wait for 5sec and the download button appears click on it to download as shown bellow

Please Comment if you like this tutorial we need your feedback..

Mikrotik Initial Configuration

noreply@blogger.com (Anonymous) — Thu, 30 Jan 2014 15:29:00 +0000

Summary

Congratulations, you have got hold of MikroTik router for your home network. This guide will help you to do initial configuration of the router to make your home network a safe place to be.

The guide is mostly intended in case if default configuration did not get you to the internet right away, however some parts of the guide is still useful.

Connecting wires

Router's initial configuration should be suitable for most of the cases. Description of the configuration is on the back of the box and also described in the online manual.

The best way to connect wires as described on the box:

Connect ethernet wire from your internet service provider (ISP) to port ether1, rest of the ports on the router are for local area network (LAN). At this moment, your router is protected by default firewall configuration so you should not worry about that;
Connect LAN wires to the rest of the ports.

Configuring router

Initial configuration has DHCP client on WAN interface (ether1), rest of the ports are considered your local network with DHCP server configured for automatic address configuration on client devices. To connect to the router you have to set your computer to accept DHCP settings and plug in the ethernet cable in one of the LAN ports (please check routerboard.com for port numbering of the product you own, or check front panel of the router).

Logging into the router

To access the router enter address 192.168.88.1 in your browser. Main RouterOS page will be shown as in the screen shot below. Click on WebFig from the list.

You will be prompted for login and password to access configuration interface. Default login name is admin and blank password (leave empty field as it is already).

Router user accounts

It is good idea to start with password setup or add new user so that router is not accessible by anyone on your network. User configuration is done form System -> Users menu.

To access this menu, click on System on the left panel and from the dropdown menu chooseUsers (as shown in screenshot on the left)

You will see this screen, where you can manage users of the router. In this screen you can edit or add new users:

When you click on account name (in this case admin), edit screen for the user will be displayed.
If you click on Add new button, new user creation screen will be displayed.

Both screens are similar as illustrated in screenshot below. After editing user's data click OK (to accept changes) orCancel. It will bring you back to initial screen of user management.

In user edit/Add new screen you can alter existing user or create new. Field marked with 2. is the user name, field 1.will open password screen, where old password for the user can be changed or added new one (see screenshot below).

Configure access to internet

If initial configuration did not work (your ISP is not providing DHCP server for automatic configuration) then you will have to have details from your ISP for static configuration of the router. These settings should include

IP address you can use
Network mask for the IP address
Default gateway address

Less important settings regarding router configuration:

DNS address for name resolution
NTP server address for time automatic configuration
Your previous MAC address of the interface facing ISP

DHCP Client

Default configuration is set up using DHCP-Client on interface facing your ISP or wide area network (WAN). It has to be disabled if your ISP is not providing this service in the network. Open 'IP -> DHCP Client' and inspect field 1. to see status of DHCP Client, if it is in state as displayed in screenshot, means your ISP is not providing you with automatic configuration and you can use button in selection 2. to remove DHCP-Client configured on the interface.

Static IP Address

To manage IP addresses of the router open 'IP -> Address'

You will have one address here - address of your local area network (LAN) 192.168.88.1 one you are connected to router. Select Add new to add new static IP address to your router's configuration.

You have to fill only fields that are marked. Field 1. should contain IP address provided by your ISP and network mask'. Examples:

172.16.88.67/24

both of these notations mean the same, if your ISP gave you address in one notation, or in the other, use one provided and router will do the rest of calculation.

Other field of interest is interface this address is going to be assigned. This should be interface your ISP is connected to, if you followed this guide - interface contains name - ether1

Note: While you type in the address, webfig will calculate if address you have typed is acceptable, if it is not label of the field will turn red, otherwise it will be blue

Note: It is good practice to add comments on the items to give some additional information for the future, but that is not required

Configuring network address translation (NAT)

Since you are using local and global networks, you have to set up network masquerade, so that your LAN is hidden behind IP address provided by your ISP. That should be so, since your ISP does not know what LAN addresses you are going to use and your LAN will not be routed from global network.

To check if you have the source NAT open 'IP -> Firewall -> tab NAT' and check if item highlighted (or similar) is in your configuration.

Essential fields for masquerade to work:

enabled is checked;
chain - should be srcnat;
out-interface is set to interface connected to your ISP network, Following this guide ether1;
action should be set to masquerade.

In screenshot correct rule is visible, note that irrelevant fields that should not have any value set here are hidden (and can be ignored)

Default gateway

under 'IP -> Routes' menu you have to add routing rule called default route. And select Add new to add new route.

In screen presented you will see the following screen:

here you will have to press button with + near red Gateway label and enter in the field default gateway, or simply gateway given by your ISP.

This should look like this, when you have pressed the + button and enter gateway into the field displayed.

After this, you can press OK button to finish creation of the default route.

At this moment, you should be able to reach any globally available host on the Internet using IP address.

To check weather addition of default gateway was successful use Tools -> Ping

Domain name resolution

To be able to open web pages or access Internet hosts by domain name DNS should be configured, either on your router or your computer. In scope of this guide, i will present only option of router configuration, so that DNS addresses are given out by DHCP-Server that you are already using.

This can be done in 'IP -> DNS ->Settings', first Open 'IP ->DNS':

Then select Settings to set up DNS cacher on the router. You have to add field to enter DNS IP address, section 1. in image below. and check Allow Remote Requests marked with 2.

The result of pressing + twice will result in 2 fields for DNS IP addresses:

Note: Filling acceptable value in the field will turn field label blue, other way it will be marked red.

SNTP Client

RouterBOARD routers do not keep time between restarts or power failuers. To have correct time on the router set up SNTP client if you require that.

To do that, go to 'System -> SNTP' where you have to enable it, first mark, change mode from broadcast to unicast, so you can use global or ISP provided NTP servers, that will allow to enter NTP server IP addresses in third area.

Setting up Wireless

For ease of use bridged wireless setup will be used, so that your wired hosts will be in same ethernet broadcast domain as wireless clients.

To make this happen several things has to be checked:

Ethernet interfaces designated for LAN are swtiched or bridged, or they are separate ports;
If bridge interface exists;
Wireless interface mode is set to ap-bridge (in case, router you have has level 4 or higher license level), if not, then mode has to be set to bridge and only one client (station) will be able to connect to the router using wireless network;
There is appropriate security profile created and selected in interface settings.

Check Ethernet interface state

Warning: Changing settings may affect connectivity to your router and you can be disconnected from the router. Use Safe Mode so in case of disconnection made changes are reverted back to what they where before you entered safe mode

To check if ethernet port is switched, in other words, if ethernet port is set as slave to another port go to 'Interface' menu and open Ethernet interface details. They can be distinguished by Type column displaying Ethernet.

When interface details are opened, look up Master Port setting.

Available settings for the attribute are none, or one of Ethernet interface names. If name is set, that mean, that interface is set as slave port. Usually RouterBOARD routers will come with ether1 as intended WAN port and rest of ports will be set as slave ports of ether2 for LAN use.

Check if all intended LAN Ethernet ports are set as slave ports of the rest of one of the LAN ports. For example, ifether2. ether3, ether4 and ether5 are intended as LAN ports, set on ether3 to ether5 attribute Master Port to ether2.

In case this operation fails - means that Ethernet interface is used as port in bridge, you have to remove them from bridge to enable hardware packet switching between Ethernet ports. To do this, go to Bridge -> Ports and remove slave ports (in example, ether3 to ether5) from the tab.

Note: If master port is present as bridge port, that is fine, intended configuration requires it there, same applies to wireless interface (wlan)

Security profile

It is important to protect your wireless network, so no malicious acts can be performed by 3rd parties using your wireless access-point.

To edit or create new security profile head to 'Wireless -> tab 'Security Prodiles' and choose one of two options:

Using Add new create new profile;
Using highlighted path in screenshot edit default profile that is already assigned to wireless interface.

In This example i will create new security profile, editing it is quite similar. Options that has to be set are highlighted with read and recommended options are outlined by red boxes and pre-set to recommended values. WPA and WPA2 is used since there are still legacy equipment around (Laptops with Windows XP, that do not support WPA2 etc.)

WPA Pre- shared key and WPA2 Pre- shared key should be entered with sufficient length. If key length is too short field label will indicate that by turning red, when sufficient length is reached it will turn blue.

Note: WPA and WPA2 pre-shared keys should be different

Note: When configuring this, you can deselect Hide passwords in page header to see the actual values of the fields, so they can be successfully entered into device configuration that are going to connect to wireless access-point

Wireless settings

Adjusting wireless settings. That can be done here:

In General section adjust settings to settings as shown in screenshot. Consider these safe, however it is possible, that these has to be adjusted slightly.

Interface mode has to be set to ap-bridge, if that is not possible (license resctrictions) set to bridge, so one client will be able to connect to device.

WiFI devices usually are designed with 2.4GHz modes in mind, setting band to 2GHz-b/g/n will enable clients with 802.11b, 802.11g and 802.11n to connect to the access point

Adjust channel width to enable faster data rates for 802.11n clients. In example channel 6 is used, as result,20/40MHz HT Above or 20/40 MHz HT Below can be used. Choose either of them.

Set SSID - the name of the access point. It will be visible when you scan for networks using your WiFi equipment.

In section HT set change HT transmit and receive chains. It is good practice to enable all chains that are available

When settings are set accordingly it is time to enable our protected wireless access-point

Bridge LAN with Wireless

Open Bridge menu and check if there are any bridge interface available first mark. If there is not, select Add Newmarked with second mark and in the screen that opens just accept the default settings and create interface. When bridge interface is availbe continue to Ports tab where master LAN interface and WiFI interface have to be added.

First marked area is where interfaces that are added as ports to bridge interface are visible. If there are no ports added, choose Add New to add new ports to created bridge interfaces.

When new bridge port is added, select that it is enabled (part of active configuration), select correct bridge interface, following this guide - there should be only 1 interface. And select correct port - LAN interface master port and WiFi port

Finished look of bridge configured with all ports required

Troubleshooting & Advanced configuration

This section is here to make some deviations from configuration described in the guide itself. It can require more understanding of networking, wireless networks in general.

General

Check IP address

Adding IP address with wrong network mask will result in wrong network setting. To correct that problem it is required to change address field, first section, with correct address and network mask and network field with correct network, or unset it, so it is going to be recalculated again

Change password for current user

To change password of the current user, safe place to go isSystem -> Password

Where all the fields has to be filled. There is other place where this can be done in case you have full privileges on the router.

Change password for existing user

If you have full privileges on the router, it is possible to change password for any user without knowledge of current one. That can be done under System -> Users menu.

Steps are:

Select user;
type in password and re-type it to know it is one you intend to set

No access to the Internet or ISP network

If you have followed this guide to the letter but even then you can only communicate with your local hosts only and every attempt to connect to Internet fails, there are certain things to check:

If masquerade is configured properly;
If setting MAC address of previous device on WAN interface changes anything
ISP has some captive portal in place.

Respectively, there are several ways how to solve the issue, one - check configuration if you are not missing any part of configuration, second - set MAC address. Change of mac address is available only from CLI - New Terminal from the left side menu. If new window is not opening check your browser if it is allowing to open popup windows for this place. There you will have to write following command by replacing MAC address to correct one:

 /interface ethernet set ether1 mac-address=XX:XX:XX:XX:XX:XX

Or contact your ISP for details and inform that you have changed device.

Checking link

There are certain things that are required for Ethernet link to work:

Link activity lights are on when Ethernet wire is plugged into the port
Correct IP address is set on the interface
Correct route is set on the router

What to look for using ping tool:

If all packets are replied;
If all packets have approximately same round trip time (RTT) on non-congested Ethernet link

It is located here: Tool -> Ping menu. Fill in Ping To field and press start to initiate sending of ICMP packets.

Wireless

Wireless unnamed features in the guide that are good to know about. Configuration adjustments.

Channel frequencies and width

It is possible to choose different frequency, here are frequencies that can be used and channel width settings to use 40MHz HT channel (for 802.11n). For example, using channel 1 or 2412MHz frequency setting 20/40MHz HT below will not yield any results, since there are no 20MHz channels available below set frequency.

Channel #	Frequency	Below	Above
1	2412 MHz	no	yes
2	2417 MHz	no	yes
3	2422 MHz	no	yes
4	2427 MHz	no	yes
5	2432 MHz	yes	yes
6	2437 MHz	yes	yes
7	2442 MHz	yes	yes
8	2447 MHz	yes	yes
9	2452 MHz	yes	yes
10	2457 MHz	yes	yes
11	2462 MHz	yes	no
12	2467 MHz	yes	no
13	2472 MHz	yes	no

Warning: You should check how many and what frequencies you have in your regulatory domain before. If there are 10 or 11 channels adjust settings accordingly. With only 10 channels, channel #10 will have no sense of setting20/40MHz HT above since no full 20MHz channel is available

Wireless frequency usage

If wireless is not performing very well even when data rates are reported as being good, there might be that your neighbours are using same wireless channel as you are. To make sure follow these steps:

Open frequency usage monitoring tool Freq. Usage... that is located in wireless interface details;

Wait for some time as scan results are displayed. Do that for minute or two. Smaller numbers in Usage column means that channel is less crowded.

Note: Monitoring is performed on default channels for Country selected in configuration. For example, if selected country would be Latvia, there would have been 13 frequencies listed as at that country have 13 channels allowed.

Change Country settings

By default country attribute in wireless settings is set to no_country_set. It is good practice to change this (if available) to change country you are in. To do that do the following:

Go to wireless menu and select Advanced mode;

Look up Country attribute and from drop-down menu select country

Note: Advanced mode is toggle button that changes from Simple to Advanced mode and back.

Port forwarding

To make services on local servers/hosts available to general public it is possible to forward ports from outside to inside your NATed network, that is done from /ip firewall nat menu. For example, to make possible for remote helpdesk to connect to your desktop and guide you, make your local file cache available for you when not at location etc.

Static configuration

A lot of users prefer to configure these rules statically, to have more control over what service is reachable from outside and what is not. This also has to be used when service you are using does not support dynamic configuration.

Following rule will forward all connections to port 22 on the router external ip address to port 86 on your local host with set IP address:

if you require other services to be accessible you can change protocol as required, but usually services are running TCP and dst-port. If change of port is not required, eg. remote service is 22 and local is also 22, then to-ports can be left unset.

Comparable command line command:

 /ip firewall nat add chain=dstnat dst-address=172.16.88.67 protocol=tcp dst-port=22 \
 action=dst-nat to-address=192.168.88.22 to-ports=86

Note: Screenshot contain only minimal set of settings are left visible

Dynamic configuration

uPnP is used to enable dynamic port forwarding configuration where service you are running can request router using uPnP to forward some ports for it.

Warning: Services you are not aware of can request port forwarding. That can compromise security of your local network, your host running the service and your data

Configuring uPnP service on the router:

Set up what interfaces should be considered external and what internal;

 /ip upnp interface add interface=ether1 type=external
 /ip upnp interface add interface=ether2 type=internal

Enable service itself

 /ip upnp set allow-disable-external-interface=no show-dummy-rule=no enabled=yes

Limiting access to web pages

Using IP -> Web Proxy it is possible to limit access to unwanted web pages. This requires some understanding of use of WebFig interface.

Set up Web Proxy for page filtering

From IP -> Web Proxy menu Access tab open Web Proxy Settings and make sure that these attributes are set follows:

 Enabled -> checked
 Port -> 8080
 Max. Cache Size -> none
 Cache on disk -> unchecked
 Parent proxy -> unset

When required alterations are done applysettings to return to Access tab.

Set up Access rules

This list will contain all the rules that are required to limit access to sites on the Internet.

To add sample rule to deny access to any host that contain example.com do the following when adding new entry:

 Dst. Host -> .*example\.com.*
 Action -> Deny

With this rule any host that has example.com will be unaccessible.

Limitation strategies

There are two main approaches to this problem

deny only pages you know you want to deny (A)
allow only certain pages and deny everything else (B)

For approach A each site that has to be denied is added with Action set to Deny

For approach B each site that has to be allowed should be added with Action set to Allow and in the end is rule, that matches everything with Action set to Deny.

Almost 150 FREE Microsoft eBooks, covering Windows 7, Windows 8, Office 2010, Office 2013, Office 365, Office Web Apps, Windows Server 2012, Windows Phone 7, Windows Phone 8, SQL Server 2008, SQL Server 2012, SharePoint Server 2010, SharePoint Server 2013

noreply@blogger.com (Anonymous) — Mon, 20 Jan 2014 15:27:00 +0000

FREE! Now there’s a word that everyone can get excited about, right? Well, after looking at the results of the three “Free Microsoft eBooks” posts I have shared here this fiscal year (Microsoft’s fiscal year is July 1 – June 30), it is amazing to see the excitement that has come about from them and the incredible amount of downloads that have taken place to date! Just last week, I put up thethird post in the series of Free Microsoft eBooks giveaways this fiscal year and said that I wanted to give away 1,000,000 FREE downloads of the Microsoft eBooks. I’ll admit, some people thought I was crazy to put up a target as large as 1,000,000, but I had faith in my blog readers and social media followers to help spread the word and share the excitement about the offer.

Today, I am happy to share some fantastic news and some information I have been asked for that you said would be helpful for you:

1) I am happy to announce that we have reached the 1,000,000 FREE download mark for the Microsoft eBooks since my post went live last week! Thank you to all of you for helping spread the word and let others know about this offer.

2) I went back and looked at how we’re doing on the downloads of all of the eBooks from my three FREE Microsoft eBooks posts this fiscal year, and I am happy to share that we have now exceeded the 3,500,000 FREE downloads mark for the almost 150 Microsoft eBooks included in my posts since they went live! It only seemed fitting that we hit the 1,000,000 mark for last week’s post in the same 24 hour period that we exceeded the 3,500,000 mark all up for the giveaways. Again, thank you to all of you for sharing these offers this year!

3) I have been asked if once we hit the 1,000,000 FREE download mark if the offer to download the books would expire. The answer is, “No, please keep downloading the books and sharing these links with your peers, counterparts, and anyone else you think could benefit from them!”

4) Several people have asked me, “Do you have a list of the most popular eBooks being downloaded out of the ones you’ve shared?” Well, I hadn’t tallied up the list and shared anything prior to today; however, since I’ve received the ask enough times and was looking at the numbers last night, I thought I would share with you the top 50 FREE Microsoft eBooks in order, in terms of number of downloads to date since I posted about them, so you can see what they are (and make sure you have them if you don’t already). Now, something to keep in mind as you look at this list of the top 50 below, remember that two of my posts went live last July and the third one just went up last week. I call this out because the ones that have been posted since last July have obviously had more time to be downloaded, so the numbers will be skewed a little just based on that. An interesting thing I found while compiling this list of the top 50 though was, there are actually four of them that are from my post last week! That’s VERY impressive to see the download numbers grow that fast for these items in just over week to overcome 11 months worth of download time for the others. The four from last week that are flying up the charts are:

Microsoft Office 365 for professionals and small businesses: Help and How To

Deployment guide for Office 2013

Programming Windows 8 Apps with HTML, CSS, and JavaScript

Explore SharePoint 2013

So if you want to glean some insights into what’s hot right now and on top of people’s minds, it’s Office 365, Office 2013, Windows 8 (and app development for it), and SharePoint 2013. When you compare that list to the rest in the top 50, you see lots of interest in these topics, plus Windows Server, SQL Server, Microsoft Virtualization and Windows Phone, just to name a few. So, are you up to speed on these hot topics? If not, why not grab some FREE eBooks and get going?

Here’s the list of the Top 50 FREE Microsoft eBooks downloaded so far:

Windows 7 Power Users Guide PDF	Introducing Windows Server 2012 – RTM Edition! PDF EPUB MOBI	Introducing Microsoft SQL Server 2012 PDF EPUB MOBI	Programming Windows Phone 7 PDF EPUB MOBI
Introducing Microsoft SQL Server 2008 R2PDF XPS	Get started with SharePoint Server 2010 PDF EPUB MOBI	Office 365 – Connect and Collaborate virtually anywhere, anytime PDF EPUB MOBI	Understanding Microsoft Virtualization R2 Solutions PDF XPS
Microsoft Office 2010 First Look PDF XPS	Moving to Microsoft Visual Studio 2010 VS2005 PDF VS2005 XPS VS2008 PDF VS2008 XPS	Getting started with Microsoft Office 2010 – For IT Professionals PDF MOBI DOC XPS	Intro to ASP.NET MVC 4 with Visual Studio (Beta) PDF EPUB
Programming Windows Phone 7 (Special Excerpt 2) PDF	Transact-SQL Data Manipulation Language (DML) Reference PDF EPUB MOBI	SQL Server 2012 Tutorials: Analysis Services - Tabular Modeling PDF EPUB MOBI	Backup and Restore of SQL Server Databases PDF EPUB MOBI
SQL Server 2012 Tutorials: Analysis Services - Data Mining PDF EPUB MOBI	Technical reference for Microsoft SharePoint Server 2010 PDF EPUB MOBI	Security and Privacy for Microsoft Office 2010 Users PDF EPUB MOBI	Deploying Windows 7 Essential Guidance PDF
Microsoft SQL Server AlwaysOn Solutions Guide for High Availability and Disaster Recovery PDF EPUB MOBI	Own Your Future PDF XPS	Moving Applications to the Cloud, 2nd Edition PDF EPUB MOBI	SQL Server 2012 Tutorials: Analysis Services - Multidimensional Modeling PDF EPUB MOBI
Microsoft SQL Server Analysis Services Multidimensional Performance and Operations Guide PDF EPUB MOBI	Deployment guide for SharePoint Server 2010 PDF EPUB MOBI	Technical reference for Microsoft SharePoint Server 2010 PDF EPUB MOBI	QuickStart: Learn DAX Basics in 30 Minutes PDF EPUB MOBI
Getting Started with ASP.NET 4.5 Web Forms (Beta) PDF EPUB MOBI	Introducing ASP.NET Web Pages 2 PDF EPUB MOBI	Microsoft Office 365 for professionals and small businesses: Help and How To EPUB MOBI PDF	Data Analysis Expressions (DAX) Reference PDF EPUB MOBI
Deploying an ASP.NET Web Application to a Hosting Provider using Visual Studio PDF EPUB MOBI	SQL Server 2012 Upgrade Technical Guide PDF EPUB MOBI	Business continuity management for SharePoint Server 2010 PDF EPUB MOBI	Master Data Services Capacity Guidelines PDF EPUB MOBI
Configure Kerberos Authentication for SharePoint 2010 Products DOCX PDF EPUB MOBI	Deployment guide for Office 2013 EPUB MOBI PDF	SQL Server 2012 Developer Training Kit PDF	Technical reference for Microsoft Office 2010 - For IT professionals DOC PDF XPS
Programming Windows 8 Apps with HTML, CSS, and JavaScript EPUB MOBI PDF	Developing Applications for the Cloud, 2nd Edition PDF	Governance guide for Microsoft SharePoint Server 2010 PDF EPUB MOBI	What You Can Do Before You Call Tech Support (Windows 7)PDF XPS
Programming Windows 8 Apps 2nd Preview PDF	Planning guide for sites and solutions for Microsoft SharePoint Server 2010, Part 1 PDF DOC XPS	Welcome to Windows 7 PDF	Explore SharePoint 2013 EPUB MOBI PDF
Profile synchronization guide for SharePoint Server 2010 PDF EPUB MOBI	Operations guide for Microsoft Office 2010 - For IT professionals DOC PDF XPS

5) The other thing I have been asked many times is, “Do you have one single post with all of the eBooks listed so we can go through them instead of bouncing between the three different posts?” The answer to that has been No to date; however, I figured that since I was pulling together all of the stats last night, I could pull together the books into a single list as well. As such, here they are, almost 150 completely FREE Microsoft eBooks for you to download and use: (NOTE: If you don’t see a list of links below the book image, it is because it is only available in one format. Just click on the image and your download will begin)

Programming Windows 8 Apps with HTML, CSS, and JavaScript EPUB MOBI PDF	Programming Windows Phone 7 PDF EPUB MOBI	Programming Windows Phone 7 (Special Excerpt 2) PDF	Moving to Microsoft Visual Studio 2010 VS2005 PDF VS2005 XPS VS2008 PDF VS2008 XPS
Windows 7 Power Users Guide	Deploying Windows 7 Essential Guidance PDF	Welcome to Windows 7	What You Can Do Before You Call Tech Support (Windows 7) PDF XPS
Administrator's Guide for Microsoft Application Virtualization (App-V) 5.0 EPUB MOBI PDF	Administrator’s Guide for Microsoft BitLocker Administration and Monitoring 1.0 EPUB MOBI PDF	Administrator’s Guide for Microsoft Diagnostics and Recovery Toolset (DaRT) 7 EPUB MOBI PDF	Administrator’s Guide for Microsoft Diagnostics and Recovery Toolset (DaRT) 8.0 EPUB MOBI PDF
Administrator’s Guide for Microsoft User Experience Virtualization (UE-V) 1.0 EPUB MOBI PDF	Developing an end-to-end Windows Store app using C++ and XAML: Hilo PDF	Developing an end-to-end Windows Store app using JavaScript: Hilo PDF	Prism for the Windows Runtime: Developing a Windows Store business app using C#, XAML, and PrismPDF
Office 365 – Connect and Collaborate virtually anywhere, anytime PDF EPUB MOBI	Microsoft Office 2010 First Look PDF XPS	Deployment guide for Office 2013 EPUB MOBI PDF	Microsoft Office 365 for professionals and small businesses: Help and How To EPUB MOBI PDF
Getting started with Microsoft Office 2010 – For IT Professionals PDF MOBI DOC XPS	Security and Privacy for Microsoft Office 2010 Users PDF EPUB MOBI	Planning guide for Microsoft Office 2010 - For IT professionals DOC PDF XPS	Deployment guide for Microsoft Office 2010 - For IT professionals DOC PDF XPS
Deployment guide for Office 2013 Preview	Office 2010 Developer Training Kit	Office 365 Developer Training Kit	Office 365 Guides for professionals and small businesses
Technical reference for Microsoft Office 2010 - For IT professionals DOC PDF XPS	Business continuity management for SharePoint Server 2010 PDF EPUB MOBI	Deployment guide for SharePoint Server 2010 PDF EPUB MOBI	Get started with SharePoint Server 2010 PDF EPUB MOBI
Explore SharePoint 2013 EPUB MOBI PDF	Deployment guide for SharePoint 2013 EPUB MOBI PDF	Test Lab Guide: eBook for SharePoint Server 2013 Intranet and Team Sites EPUB MOBI PDF DOC	Create a Balanced Scorecard (SharePoint Server 2010) EPUB MOBI PDF
SharePoint Server for Business IntelligenceEPUB MOBI PDF	Deployment guide for SharePoint 2013 Preview	Getting started with Microsoft SharePoint Foundation 2010	Technical reference for Microsoft SharePoint Server 2010
Governance guide for Microsoft SharePoint Server 2010 PDF EPUB MOBI	Profile synchronization guide for SharePoint Server 2010 PDF EPUB MOBI	Remote BLOB storage for Microsoft SharePoint Server 2010 PDF EPUB MOBI	Technical reference for Microsoft SharePoint Server 2010 PDF EPUB MOBI
Upgrading to SharePoint Server 2010 PDF EPUB MOBI	Getting Started with SharePoint Server 2010 PDF DOC XPS EPUB MOBI	Planning guide for sites and solutions for Microsoft SharePoint Server 2010, Part 1 PDF DOC XPS	Planning guide for sites and solutions for Microsoft SharePoint Server 2010, Part 2 PDF DOC XPS
Planning guide for server farms and environments for Microsoft SharePoint Server 2010 PDF XPS DOC	Capacity planning for Microsoft SharePoint Server 2010 PDF XPS DOC	5 Tips for a Smooth SSIS Upgrade to SQL Server 2012 EPUB MOBI PDF	A Hitchiker's Guide to Microsoft StreamInsight Queries EPUB MOBI PDF
Data Mining Extensions (DMX) Reference EPUB MOBI PDF	Data Quality Services EPUB MOBI PDF	High Availability Solutions EPUB MOBI PDF	Master Data Services EPUB MOBI PDF
Monitor and Tune for Performance EPUB MOBI PDF	Multidimensional Expressions (MDX) Reference EPUB MOBI PDF	SQL Server Distributed Replay EPUB MOBI PDF	Transact-SQL Data Definition Language (DDL) Reference EPUB MOBI PDF
XQuery Language Reference EPUB MOBI PDF	Extracting and Loading SharePoint Data in SQL Server Integration Services EPUB MOBI PDF	Integration Services: Extending Packages with Scripting EPUB MOBI PDF	Multidimensional Model Programming EPUB MOBI PDF
Optimized Bulk Loading of Data into Oracle EPUB MOBI PDF	Planning Disaster Recovery for Microsoft SQL Server Reporting Services in SharePoint Integrated Mode EPUB MOBI PDF	SQL Server 2012 Tutorials: Reporting Services EPUB MOBI PDF	SQL Server 2012 Tutorials: Writing Transact-SQL Statements EPUB MOBI PDF
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Almost 150 FREE Microsoft eBooks, covering Windows 7, Windows 8, Office 2010, Office 2013, Office 365, Office Web Apps, Windows Server 2012, Windows Phone 7, Windows Phone 8, SQL Server 2008, SQL Server 2012, SharePoint Server 2010, SharePoint Server 2013

noreply@blogger.com (Anonymous) — Mon, 20 Jan 2014 15:25:00 +0000

Today, I am happy to share some fantastic news and some information I have been asked for that you said would be helpful for you:

Microsoft Office 365 for professionals and small businesses: Help and How To

Deployment guide for Office 2013

Programming Windows 8 Apps with HTML, CSS, and JavaScript

Explore SharePoint 2013

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Networking Tutorials

noreply@blogger.com (Anonymous) — Tue, 14 Jan 2014 18:45:00 +0000

In today’s Internet age, the corporate network is truly the lifeblood of business. As the success of any organization becomes increasingly intertwined and dependent on its network it is crucial to understand the latest in networking technology. And as device networking increases the number of things connected to networks and the Internet, rapidly making M2M (machine to machine) a reality, speed, remote management, wireless networking, reliability and the security of networked devices are all concerns that must be addressed.
We have put together the following tutorials to help provide you with a solid foundation and understanding of basic networking protocols and techniques as well as serial to Ethernet/802.11 device server technology.

Ethernet Tutorial - Part I: Networking Basics

Computer networking has become an integral part of business today. Individuals, professionals and academics have also learned to rely on computer networks for capabilities such as electronic mail and access to remote databases for research and communication purposes. Networking has thus become an increasingly pervasive, worldwide reality because it is fast, efficient, reliable and effective. Just how all this information is transmitted, stored, categorized and accessed remains a mystery to the average computer user.
This tutorial will explain the basics of some of the most popular technologies used in networking, and will include the following:

Types of Networks - including LANs, WANs and WLANs
The Internet and Beyond - The Internet and its contributions to intranets and extranets
Types of LAN Technology - including Ethernet, Fast Ethernet, Gigabit Ethernet, 10 Gigabit Ethernet,
ATM, PoE and Token Ring
Networking and Ethernet Basics - including standard code, media, topographies, collisions and CSMA/CD
Ethernet Products - including transceivers, network interface cards, hubs and repeaters

Types of Networks

In describing the basics of networking technology, it will be helpful to explain the different types of networks in use.

Local Area Networks (LANs)

A network is any collection of independent computers that exchange information with each other over a shared communication medium. Local Area Networks or LANs are usually confined to a limited geographic area, such as a single building or a college campus. LANs can be small, linking as few as three computers, but can often link hundreds of computers used by thousands of people. The development of standard networking protocols and media has resulted in worldwide proliferation of LANs throughout business and educational organizations.

Wide Area Networks (WANs)

Often elements of a network are widely separated physically. Wide area networking combines multiple LANs that are geographically separate. This is accomplished by connecting the several LANs with dedicated leased lines such as a T1 or a T3, by dial-up phone lines (both synchronous and asynchronous), by satellite links and by data packet carrier services. WANs can be as simple as a modem and a remote access server for employees to dial into, or it can be as complex as hundreds of branch offices globally linked. Special routing protocols and filters minimize the expense of sending data over vast distances.

Wireless Local Area Networks (WLANs)

Wireless LANs, or WLANs, use radio frequency (RF) technology to transmit and receive data over the air. This minimizes the need for wired connections. WLANs give users mobility as they allow connection to a local area network without having to be physically connected by a cable. This freedom means users can access shared resources without looking for a place to plug in cables, provided that their terminals are mobile and within the designated network coverage area. With mobility, WLANs give flexibility and increased productivity, appealing to both entrepreneurs and to home users. WLANs may also enable network administrators to connect devices that may be physically difficult to reach with a cable.
The Institute for Electrical and Electronic Engineers (IEEE) developed the 802.11 specification for wireless LAN technology. 802.11 specifies over-the-air interface between a wireless client and a base station, or between two wireless clients. WLAN 802.11 standards also have security protocols that were developed to provide the same level of security as that of a wired LAN.
The first of these protocols is Wired Equivalent Privacy (WEP). WEP provides security by encrypting data sent over radio waves from end point to end point.
The second WLAN security protocol is Wi-Fi Protected Access (WPA). WPA was developed as an upgrade to the security features of WEP. It works with existing products that are WEP-enabled but provides two key improvements: improved data encryption through the temporal key integrity protocol (TKIP) which scrambles the keys using a hashing algorithm. It has means for integrity-checking to ensure that keys have not been tampered with. WPA also provides user authentication with the extensible authentication protocol (EAP).

Wireless Protocols

Specification	Data Rate	Modulation Scheme	Security
802.11	1 or 2 Mbps in the 2.4 GHz band	FHSS, DSSS	WEP and WPA
802.11a	54 Mbps in the 5 GHz band	OFDM	WEP and WPA
802.11b/High Rate/Wi-Fi	11 Mbps (with a fallback to 5.5, 2, and 1 Mbps) in the 2.4 GHz band	DSSS with CCK	WEP and WPA
802.11g/Wi-Fi	54 Mbps in the 2.4 GHz band	OFDM when above 20Mbps, DSSS with CCK when below 20Mbps	WEP and WPA

The Internet and Beyond

More than just a technology, the Internet has become a way of life for many people, and it has spurred a revolution of sorts for both public and private sharing of information. The most popular source of information about almost anything, the Internet is used daily by technical and non-technical users alike.

The Internet: The Largest Network of All

With the meteoric rise in demand for connectivity, the Internet has become a major communications highway for millions of users. It is a decentralized system of linked networks that are worldwide in scope. It facilitates data communication services such as remote log-in, file transfer, electronic mail, the World Wide Web and newsgroups. It consists of independent hosts of computers that can designate which Internet services to use and which of their local services to make available to the global community.
Initially restricted to military and academic institutions, the Internet now operates on a three-level hierarchy composed of backbone networks, mid-level networks and stub networks. It is a full-fledged conduit for any and all forms of information and commerce. Internet websites now provide personal, educational, political and economic resources to virtually any point on the planet.

Intranet: A Secure Internet-like Network for Organizations

With advancements in browser-based software for the Internet, many private organizations have implemented intranets. An intranet is a private network utilizing Internet-type tools, but available only within that organization. For large organizations, an intranet provides easy access to corporate information for designated employees.

Extranet: A Secure Means for Sharing Information with Partners

While an intranet is used to disseminate confidential information within a corporation, an extranet is commonly used by companies to share data in a secure fashion with their business partners. Internet-type tools are used by content providers to update the extranet. Encryption and user authentication means are provided to protect the information, and to ensure that designated people with the proper access privileges are allowed to view it.

Types of LAN Technology

Ethernet

Ethernet is the most popular physical layer LAN technology in use today. It defines the number of conductors that are required for a connection, the performance thresholds that can be expected, and provides the framework for data transmission. A standard Ethernet network can transmit data at a rate up to 10 Megabits per second (10 Mbps). Other LAN types include Token Ring, Fast Ethernet, Gigabit Ethernet, 10 Gigabit Ethernet, Fiber Distributed Data Interface (FDDI), Asynchronous Transfer Mode (ATM) and LocalTalk.
Ethernet is popular because it strikes a good balance between speed, cost and ease of installation. These benefits, combined with wide acceptance in the computer marketplace and the ability to support virtually all popular network protocols, make Ethernet an ideal networking technology for most computer users today.
The Institute for Electrical and Electronic Engineers developed an Ethernet standard known as IEEE Standard 802.3. This standard defines rules for configuring an Ethernet network and also specifies how the elements in an Ethernet network interact with one another. By adhering to the IEEE standard, network equipment and network protocols can communicate efficiently.

Fast Ethernet

The Fast Ethernet standard (IEEE 802.3u) has been established for Ethernet networks that need higher transmission speeds. This standard raises the Ethernet speed limit from 10 Mbps to 100 Mbps with only minimal changes to the existing cable structure. Fast Ethernet provides faster throughput for video, multimedia, graphics, Internet surfing and stronger error detection and correction.
There are three types of Fast Ethernet: 100BASE-TX for use with level 5 UTP cable; 100BASE-FX for use with fiber-optic cable; and 100BASE-T4 which utilizes an extra two wires for use with level 3 UTP cable. The 100BASE-TX standard has become the most popular due to its close compatibility with the 10BASE-T Ethernet standard.
Network managers who want to incorporate Fast Ethernet into an existing configuration are required to make many decisions. The number of users in each site on the network that need the higher throughput must be determined; which segments of the backbone need to be reconfigured specifically for 100BASE-T; plus what hardware is necessary in order to connect the 100BASE-T segments with existing 10BASE-T segments. Gigabit Ethernet is a future technology that promises a migration path beyond Fast Ethernet so the next generation of networks will support even higher data transfer speeds.

Gigabit Ethernet

Gigabit Ethernet was developed to meet the need for faster communication networks with applications such as multimedia and Voice over IP (VoIP). Also known as "gigabit-Ethernet-over-copper" or 1000Base-T, GigE is a version of Ethernet that runs at speeds 10 times faster than 100Base-T. It is defined in the IEEE 802.3 standard and is currently used as an enterprise backbone. Existing Ethernet LANs with 10 and 100 Mbps cards can feed into a Gigabit Ethernet backbone to interconnect high performance switches, routers and servers.
From the data link layer of the OSI model upward, the look and implementation of Gigabit Ethernet is identical to that of Ethernet. The most important differences between Gigabit Ethernet and Fast Ethernet include the additional support of full duplex operation in the MAC layer and the data rates.

10 Gigabit Ethernet

10 Gigabit Ethernet is the fastest and most recent of the Ethernet standards. IEEE 802.3ae defines a version of Ethernet with a nominal rate of 10Gbits/s that makes it 10 times faster than Gigabit Ethernet.
Unlike other Ethernet systems, 10 Gigabit Ethernet is based entirely on the use of optical fiber connections. This developing standard is moving away from a LAN design that broadcasts to all nodes, toward a system which includes some elements of wide area routing. As it is still very new, which of the standards will gain commercial acceptance has yet to be determined.

Asynchronous Transfer Mode (ATM)

ATM is a cell-based fast-packet communication technique that can support data-transfer rates from sub-T1 speeds to 10 Gbps. ATM achieves its high speeds in part by transmitting data in fixed-size cells and dispensing with error-correction protocols. It relies on the inherent integrity of digital lines to ensure data integrity.
ATM can be integrated into an existing network as needed without having to update the entire network. Its fixed-length cell-relay operation is the signaling technology of the future and offers more predictable performance than variable length frames. Networks are extremely versatile and an ATM network can connect points in a building, or across the country, and still be treated as a single network.

Power over Ethernet (PoE)

PoE is a solution in which an electrical current is run to networking hardware over the Ethernet Category 5 cable or higher. This solution does not require an extra AC power cord at the product location. This minimizes the amount of cable needed as well as eliminates the difficulties and cost of installing extra outlets.

LAN Technology Specifications

Name	IEEE Standard	Data Rate	Media Type	Maximum Distance
Ethernet	802.3	10 Mbps	10Base-T	100 meters
Fast Ethernet/ 100Base-T	802.3u	100 Mbps	100Base-TX 100Base-FX	100 meters 2000 meters
Gigabit Ethernet/ GigE	802.3z	1000 Mbps	1000Base-T 1000Base-SX 1000Base-LX	100 meters 275/550 meters 550/5000 meters
10 Gigabit Ethernet	IEEE 802.3ae	10 Gbps	10GBase-SR 10GBase-LX4 10GBase-LR/ER 10GBase-SW/LW/EW	300 meters 300m MMF/ 10km SMF 10km/40km 300m/10km/40km

Token Ring

Token Ring is another form of network configuration. It differs from Ethernet in that all messages are transferred in one direction along the ring at all times. Token Ring networks sequentially pass a “token” to each connected device. When the token arrives at a particular computer (or device), the recipient is allowed to transmit data onto the network. Since only one device may be transmitting at any given time, no data collisions occur. Access to the network is guaranteed, and time-sensitive applications can be supported. However, these benefits come at a price. Component costs are usually higher, and the networks themselves are considered to be more complex and difficult to implement. Various PC vendors have been proponents of Token Ring networks.

Networking and Ethernet Basics

Protocols

After a physical connection has been established, network protocols define the standards that allow computers to communicate. A protocol establishes the rules and encoding specifications for sending data. This defines how computers identify one another on a network, the form that the data should take in transit, and how this information is processed once it reaches its final destination. Protocols also define procedures for determining the type of error checking that will be used, the data compression method, if one is needed, how the sending device will indicate that it has finished sending a message, how the receiving device will indicate that it has received a message, and the handling of lost or damaged transmissions or "packets".
The main types of network protocols in use today are: TCP/IP (for UNIX, Windows NT, Windows 95 and other platforms); IPX (for Novell NetWare); DECnet (for networking Digital Equipment Corp. computers); AppleTalk (for Macintosh computers), and NetBIOS/NetBEUI (for LAN Manager and Windows NT networks).
Although each network protocol is different, they all share the same physical cabling. This common method of accessing the physical network allows multiple protocols to peacefully coexist over the network media, and allows the builder of a network to use common hardware for a variety of protocols. This concept is known as "protocol independence," which means that devices which are compatible at the physical and data link layers allow the user to run many different protocols over the same medium.

The Open System Interconnection Model

The Open System Interconnection (OSI) model specifies how dissimilar computing devices such as Network Interface Cards (NICs), bridges and routers exchange data over a network by offering a networking framework for implementing protocols in seven layers. Beginning at the application layer, control is passed from one layer to the next. The following describes the seven layers as defined by the OSI model, shown in the order they occur whenever a user transmits information.

Layer 7: Application: This layer supports the application and end-user processes. Within this layer, user privacy is considered and communication partners, service and constraints are all identified. File transfers, email, Telnet and FTP applications are all provided within this layer.
Layer 6: Presentation (Syntax): Within this layer, information is translated back and forth between application and network formats. This translation transforms the information into data the application layer and network recognize regardless of encryption and formatting.
Layer 5: Session: Within this layer, connections between applications are made, managed and terminated as needed to allow for data exchanges between applications at each end of a dialogue.
Layer 4: Transport: Complete data transfer is ensured as information is transferred transparently between systems in this layer. The transport layer also assures appropriate flow control and end-to-end error recovery.
Layer 3: Network: Using switching and routing technologies, this layer is responsible for creating virtual circuits to transmit information from node to node. Other functions include routing, forwarding, addressing, internetworking, error and congestion control, and packet sequencing.
Layer 2: Data Link: Information in data packets are encoded and decoded into bits within this layer. Errors from the physical layer flow control and frame synchronization are corrected here utilizing transmission protocol knowledge and management. This layer consists of two sub layers: the Media Access Control (MAC) layer, which controls the way networked computers gain access to data and transmit it, and the Logical Link Control (LLC) layer, which controls frame synchronization, flow control and error checking.
Layer 1: Physical: This layer enables hardware to send and receive data over a carrier such as cabling, a card or other physical means. It conveys the bitstream through the network at the electrical and mechanical level. Fast Ethernet, RS232, and ATM are all protocols with physical layer components.

This order is then reversed as information is received, so that the physical layer is the first and application layer is the final layer that information passes through.

Standard Ethernet Code

In order to understand standard Ethernet code, one must understand what each digit means. Following is a guide:

Guide to Ethernet Coding

10	at the beginning means the network operates at 10Mbps.
BASE	means the type of signaling used is baseband.
2 or 5	at the end indicates the maximum cable length in meters.
T	the end stands for twisted-pair cable.
X	at the end stands for full duplex-capable cable.
FL	at the end stands for fiber optic cable.

For example: 100BASE-TX indicates a Fast Ethernet connection (100 Mbps) that uses a
twisted pair cable capable of full-duplex transmissions.

Media

An important part of designing and installing an Ethernet is selecting the appropriate Ethernet medium. There are four major types of media in use today: Thickwire for 10BASE5 networks; thin coax for 10BASE2 networks; unshielded twisted pair (UTP) for 10BASE-T networks; and fiber optic for 10BASE-FL or Fiber-Optic Inter-Repeater Link (FOIRL) networks. This wide variety of media reflects the evolution of Ethernet and also points to the technology's flexibility. Thickwire was one of the first cabling systems used in Ethernet, but it was expensive and difficult to use. This evolved to thin coax, which is easier to work with and less expensive. It is important to note that each type of Ethernet, Fast Ethernet, Gigabit Ethernet, 10 Gigabit Ethernet, has its own preferred media types.
The most popular wiring schemes are 10BASE-T and 100BASE-TX, which use unshielded twisted pair (UTP) cable. This is similar to telephone cable and comes in a variety of grades, with each higher grade offering better performance. Level 5 cable is the highest, most expensive grade, offering support for transmission rates of up to 100 Mbps. Level 4 and level 3 cable are less expensive, but cannot support the same data throughput speeds; level 4 cable can support speeds of up to 20 Mbps; level 3 up to 16 Mbps. The 100BASE-T4 standard allows for support of 100 Mbps Ethernet over level 3 cables, but at the expense of adding another pair of wires (4 pair instead of the 2 pair used for 10BASE-T). For most users, this is an awkward scheme and therefore 100BASE-T4 has seen little popularity. Level 2 and level 1 cables are not used in the design of 10BASE-T networks.
For specialized applications, fiber-optic, or 10BASE-FL, Ethernet segments are popular. Fiber-optic cable is more expensive, but it is invaluable in situations where electronic emissions and environmental hazards are a concern. Fiber-optic cable is often used in inter-building applications to insulate networking equipment from electrical damage caused by lightning. Because it does not conduct electricity, fiber-optic cable can also be useful in areas where heavy electromagnetic interference is present, such as on a factory floor. The Ethernet standard allows for fiber-optic cable segments up to two kilometers long, making fiber-optic Ethernet perfect for connecting nodes and buildings that are otherwise not reachable with copper media.

Cable Grade Capabilities

Cable Name	Makeup	Frequency Support	Data Rate	Network Compatibility
Cat-5	4 twisted pairs of copper wire -- terminated by RJ45 connectors	100 MHz	Up to 1000Mbps	ATM, Token Ring,1000Base-T, 100Base-TX, 10Base-T
Cat-5e	4 twisted pairs of copper wire -- terminated by RJ45 connectors	100 MHz	Up to 1000Mbps	10Base-T, 100Base-TX, 1000Base-T
Cat-6	4 twisted pairs of copper wire -- terminated by RJ45 connectors	250 MHz	1000Mbps	10Base-T, 100Base-TX, 1000Base-T

Topologies

Network topology is the geometric arrangement of nodes and cable links in a LAN. Two general configurations are used, bus and star. These two topologies define how nodes are connected to one another in a communication network. A node is an active device connected to the network, such as a computer or a printer. A node can also be a piece of networking equipment such as a hub, switch or a router.
A bus topology consists of nodes linked together in a series with each node connected to a long cable or bus. Many nodes can tap into the bus and begin communication with all other nodes on that cable segment. A break anywhere in the cable will usually cause the entire segment to be inoperable until the break is repaired. Examples of bus topology include 10BASE2 and 10BASE5.

General Topology Configurations

10BASE-T Ethernet and Fast Ethernet use a star topology where access is controlled by a central computer. Generally a computer is located at one end of the segment, and the other end is terminated in central location with a hub or a switch. Because UTP is often run in conjunction with telephone cabling, this central location can be a telephone closet or other area where it is convenient to connect the UTP segment to a backbone. The primary advantage of this type of network is reliability, for if one of these 'point-to-point' segments has a break; it will only affect the two nodes on that link. Other computer users on the network continue to operate as if that segment were non-existent.

Collisions

Ethernet is a shared medium, so there are rules for sending packets of data to avoid conflicts and to protect data integrity. Nodes determine when the network is available for sending packets. It is possible that two or more nodes at different locations will attempt to send data at the same time. When this happens, a packet collision occurs.
Minimizing collisions is a crucial element in the design and operation of networks. Increased collisions are often the result of too many users on the network. This leads to competition for network bandwidth and can slow the performance of the network from the user's point of view. Segmenting the network is one way of reducing an overcrowded network, i.e., by dividing it into different pieces logically joined together with a bridge or switch.

CSMA/CD

In order to manage collisions Ethernet uses a protocol called Carrier Sense Multiple Access/Collision Detection (CSMA/CD). CSMA/CD is a type of contention protocol that defines how to respond when a collision is detected, or when two devices attempt to transmit packages simultaneously. Ethernet allows each device to send messages at any time without having to wait for network permission; thus, there is a high possibility that devices may try to send messages at the same time.
After detecting a collision, each device that was transmitting a packet delays a random amount of time before re-transmitting the packet. If another collision occurs, the device waits twice as long before trying to re-transmit.

Ethernet Products

The standards and technology just discussed will help define the specific products that network managers use to build Ethernet networks. The following presents the key products needed to build an Ethernet LAN.

Transceivers

Transceivers are also referred to as Medium Access Units (MAUs). They are used to connect nodes to the various Ethernet media. Most computers and network interface cards contain a built-in 10BASE-T or 10BASE2 transceiver which allows them to be connected directly to Ethernet without the need for an external transceiver.
Many Ethernet devices provide an attachment unit interface (AUI) connector to allow the user to connect to any type of medium via an external transceiver. The AUI connector consists of a 15-pin D-shell type connector, female on the computer side, male on the transceiver side.
For Fast Ethernet networks, a new interface called the MII (Media Independent Interface) was developed to offer a flexible way to support 100 Mbps connections. The MII is a popular way to connect 100BASE-FX links to copper-based Fast Ethernet devices.

Network Interface Cards

Network Interface Cards, commonly referred to as NICs, are used to connect a PC to a network. The NIC provides a physical connection between the networking cable and the computer's internal bus. Different computers have different bus architectures. PCI bus slots are most commonly found on 486/Pentium PCs and ISA expansion slots are commonly found on 386 and older PCs. NICs come in three basic varieties: 8-bit, 16-bit, and 32-bit. The larger the number of bits that can be transferred to the NIC, the faster the NIC can transfer data to the network cable. Most NICs are designed for a particular type of network, protocol, and medium, though some can serve multiple networks.
Many NIC adapters comply with plug-and-play specifications. On these systems, NICs are automatically configured without user intervention, while on non-plug-and-play systems, configuration is done manually through a set-up program and/or DIP switches.
Cards are available to support almost all networking standards. Fast Ethernet NICs are often 10/100 capable, and will automatically set to the appropriate speed. Gigabit Ethernet NICs are 10/100/1000 capable with auto negotiation depending on the user’s Ethernet speed. Full duplex networking is another option where a dedicated connection to a switch allows a NIC to operate at twice the speed.

Hubs/Repeaters

Hubs/repeaters are used to connect together two or more Ethernet segments of any type of medium. In larger designs, signal quality begins to deteriorate as segments exceed their maximum length. Hubs provide the signal amplification required to allow a segment to be extended a greater distance. A hub repeats any incoming signal to all ports.
Ethernet hubs are necessary in star topologies such as 10BASE-T. A multi-port twisted pair hub allows several point-to-point segments to be joined into one network. One end of the point-to-point link is attached to the hub and the other is attached to the computer. If the hub is attached to a backbone, then all computers at the end of the twisted pair segments can communicate with all the hosts on the backbone. The number and type of hubs in any one-collision domain is limited by the Ethernet rules. These repeater rules are discussed in more detail later.
A very important fact to note about hubs is that they only allow users to share Ethernet. A network of hubs/repeaters is termed a "shared Ethernet," meaning that all members of the network are contending for transmission of data onto a single network (collision domain). A hub/repeater propagates all electrical signals including the invalid ones. Therefore, if a collision or electrical interference occurs on one segment, repeaters make it appear on all others as well. This means that individual members of a shared network will only get a percentage of the available network bandwidth.
Basically, the number and type of hubs in any one collision domain for 10Mbps Ethernet is limited by the following rules:

Network Type	Max Nodes Per Segment	Max Distance Per Segment
10BASE-T	2	100m
10BASE-FL	2	2000m

Ethernet Tutorial - Part II: Adding Speed

The phrase “you can never get too much of a good thing” can certainly be applied to networking. Once the benefits of networking are demonstrated, there is a thirst for even faster, more reliable connections to support a growing number of users and highly-complex applications.
How to obtain that added bandwidth can be an issue. While repeaters allow LANs to extend beyond normal distance limitations, they still limit the number of nodes that can be supported.
Bridges and switches on the other hand allow LANs to grow significantly larger by virtue of their ability to support full Ethernet segments on each port. Additionally, bridges and switches selectively filter network traffic to only those packets needed on each segment, significantly increasing throughput on each segment and on the overall network.
Network managers continue to look for better performance and more flexibility for network topologies, bridges and switches. To provide a better understanding of these and related technologies, this tutorial will cover:

Bridges
Ethernet Switches
Routers
Network Design Criteria
When and Why Ethernets Become Too Slow
Increasing Performance with Fast and Gigabit Ethernet

Bridges

Bridges connect two LAN segments of similar or dissimilar types, such as Ethernet and Token Ring. This allows two Ethernet segments to behave like a single Ethernet allowing any pair of computers on the extended Ethernet to communicate. Bridges are transparent therefore computers don’t know whether a bridge separates them.
Bridges map the Ethernet addresses of the nodes residing on each network segment and allow only necessary traffic to pass through the bridge. When a packet is received by the bridge, the bridge determines the destination and source segments. If the segments are the same, the packet is dropped or also referred to as “filtered"; if the segments are different, then the packet is "forwarded" to the correct segment. Additionally, bridges do not forward bad or misaligned packets.
Bridges are also called "store-and-forward" devices because they look at the whole Ethernet packet before making filtering or forwarding decisions. Filtering packets and regenerating forwarded packets enables bridging technology to split a network into separate collision domains. Bridges are able to isolate network problems; if interference occurs on one of two segments, the bridge will receive and discard an invalid frame keeping the problem from affecting the other segment. This allows for greater distances and more repeaters to be used in the total network design.

Dealing with Loops

Most bridges are self-learning task bridges; they determine the user Ethernet addresses on the segment by building a table as packets that are passed through the network. However, this self-learning capability dramatically raises the potential of network loops in networks that have many bridges. A loop presents conflicting information on which segment a specific address is located and forces the device to forward all traffic. The Distributed Spanning Tree (DST) algorithm is a software standard (found in the IEEE 802.1d specification) that describes how switches and bridges can communicate to avoid network loops.

Ethernet Switches

Ethernet switches are an expansion of the Ethernet bridging concept. The advantage of using a switched Ethernet is parallelism. Up to one-half of the computers connected to a switch can send data at the same time.
LAN switches link multiple networks together and have two basic architectures: cut-through and store-and-forward. In the past, cut-through switches were faster because they examined the packet destination address only before forwarding it on to its destination segment. A store-and-forward switch works like a bridge in that it accepts and analyzes the entire packet before forwarding it to its destination.
Historically, store-and-forward took more time to examine the entire packet, although one benefit was that it allowed the switch to catch certain packet errors and keep them from propagating through the network. Today, the speed of store-and-forward switches has caught up with cut-through switches so the difference between the two is minimal. Also, there are a large number of hybrid switches available that mix both cut-through and store-and-forward architectures.
Both cut-through and store-and-forward switches separate a network into collision domains, allowing network design rules to be extended. Each of the segments attached to an Ethernet switch has a full 10 Mbps of bandwidth shared by fewer users, which results in better performance (as opposed to hubs that only allow bandwidth sharing from a single Ethernet). Newer switches today offer high-speed links, either Fast Ethernet, Gigabit Ethernet, 10 Gigabit Ethernet or ATM. These are used to link switches together or give added bandwidth to high-traffic servers. A network composed of a number of switches linked together via uplinks is termed a "collapsed backbone" network.

Routers

A router is a device that forwards data packets along networks, and determines which way to send each data packet based on its current understanding of the state of its connected networks. Routers are typically connected to at least two networks, commonly two LANs or WANs or a LAN and its Internet Service Provider’s (ISPs) network. Routers are located at gateways, the places where two or more networks connect.
Routers filter out network traffic by specific protocol rather than by packet address. Routers also divide networks logically instead of physically. An IP router can divide a network into various subnets so that only traffic destined for particular IP addresses can pass between segments. Network speed often decreases due to this type of intelligent forwarding. Such filtering takes more time than that exercised in a switch or bridge, which only looks at the Ethernet address. However, in more complex networks, overall efficiency is improved by using routers.

Network Design Criteria

Ethernets and Fast Ethernets have design rules that must be followed in order to function correctly. The maximum number of nodes, number of repeaters and maximum segment distances are defined by the electrical and mechanical design properties of each type of Ethernet media.
A network using repeaters, for instance, functions with the timing constraints of Ethernet. Although electrical signals on the Ethernet media travel near the speed of light, it still takes a finite amount of time for the signal to travel from one end of a large Ethernet to another. The Ethernet standard assumes it will take roughly 50 microseconds for a signal to reach its destination.
Ethernet is subject to the "5-4-3" rule of repeater placement: the network can only have five segments connected; it can only use four repeaters; and of the five segments, only three can have users attached to them; the other two must be inter-repeater links.
If the design of the network violates these repeater and placement rules, then timing guidelines will not be met and the sending station will resend that packet. This can lead to lost packets and excessive resent packets, which can slow network performance and create trouble for applications. New Ethernet standards (Fast Ethernet, GigE, and 10 GigE) have modified repeater rules, since the minimum packet size takes less time to transmit than regular Ethernet. The length of the network links allows for a fewer number of repeaters. In Fast Ethernet networks, there are two classes of repeaters. Class I repeaters have a latency of 0.7 microseconds or less and are limited to one repeater per network. Class II repeaters have a latency of 0.46 microseconds or less and are limited to two repeaters per network. The following are the distance (diameter) characteristics for these types of Fast Ethernet repeater combinations:

Fast Ethernet	Copper	Fiber
No Repeaters One Class I Repeater One Class II Repeater Two Class II Repeaters	100m 200m 200m 205m	412m* 272m 272m 228m

* Full Duplex Mode 2 km

When conditions require greater distances or an increase in the number of nodes/repeaters, then a bridge, router or switch can be used to connect multiple networks together. These devices join two or more separate networks, allowing network design criteria to be restored. Switches allow network designers to build large networks that function well. The reduction in costs of bridges and switches reduces the impact of repeater rules on network design.
Each network connected via one of these devices is referred to as a separate collision domain in the overall network.

When and Why Ethernets Become Too Slow

As more users are added to a shared network or as applications requiring more data are added, performance deteriorates. This is because all users on a shared network are competitors for the Ethernet bus. On a moderately loaded 10Mbps Ethernet network that is shared by 30-50 users, that network will only sustain throughput in the neighborhood of 2.5Mbps after accounting for packet overhead, interpacket gaps and collisions.
Increasing the number of users (and therefore packet transmissions) creates a higher collision potential. Collisions occur when two or more nodes attempt to send information at the same time. When they realize that a collision has occurred, each node shuts off for a random time before attempting another transmission. With shared Ethernet, the likelihood of collision increases as more nodes are added to the shared collision domain of the shared Ethernet. One of the steps to alleviate this problem is to segment traffic with a bridge or switch. A switch can replace a hub and improve network performance. For example, an eight-port switch can support eight Ethernets, each running at a full 10 Mbps. Another option is to dedicate one or more of these switched ports to a high traffic device such as a file server.
Greater throughput is required to support multimedia and video applications. When added to the network, Ethernet switches provide a number of enhancements over shared networks that can support these applications. Foremost is the ability to divide networks into smaller and faster segments. Ethernet switches examine each packet, determine where that packet is destined and then forward that packet to only those ports to which the packet needs to go. Modern switches are able to do all these tasks at "wirespeed," that is, without delay.
Aside from deciding when to forward or when to filter the packet, Ethernet switches also completely regenerate the Ethernet packet. This regeneration and re-timing allows each port on a switch to be treated as a complete Ethernet segment, capable of supporting the full length of cable along with all of the repeater restrictions. The standard Ethernet slot time required in CSMA/CD half-duplex modes is not long enough for running over 100m copper, so Carrier Extension is used to guarantee a 512-bit slot time.
Additionally, bad packets are identified by Ethernet switches and immediately dropped from any future transmission. This "cleansing" activity keeps problems isolated to a single segment and keeps them from disrupting other network activity. This aspect of switching is extremely important in a network environment where hardware failures are to be anticipated. Full duplex doubles the bandwidth on a link, and is another method used to increase bandwidth to dedicated workstations or servers. Full duplex modes are available for standard Ethernet, Fast Ethernet, and Gigabit Ethernet. To use full duplex, special network interface cards are installed in the server or workstation, and the switch is programmed to support full duplex operation.

Increasing Performance with Fast and Gigabit Ethernet

Implementing Fast or Gigabit Ethernet to increase performance is the next logical step when Ethernet becomes too slow to meet user needs. Higher traffic devices can be connected to switches or each other via Fast Ethernet or Gigabit Ethernet, providing a great increase in bandwidth. Many switches are designed with this in mind, and have Fast Ethernet uplinks available for connection to a file server or other switches. Eventually, Fast Ethernet can be deployed to user desktops by equipping all computers with Fast Ethernet network interface cards and using Fast Ethernet switches and repeaters.
With an understanding of the underlying technologies and products in use in Ethernet networks, the next tutorial will advance to a discussion of some of the most popular real-world applications.

Ethernet Tutorial - Part III: Sharing Devices

A Look at Device Server Technology

Device networking starts with a device server, which allows almost any device with serial connectivity to connect to Ethernet networks quickly and cost-effectively. These products include all of the elements needed for device networking and because of their scalability; they do not require a server or gateway.
This tutorial provides an introduction to the functionality of a variety of device servers. It will cover print servers, terminal servers and console servers, as well as embedded and external device servers. For each of these categories, there will also be a review of specific Lantronix offerings.

An Introduction to Device Servers

A device server is characterized by a minimal operating architecture that requires no per seat network operating system license, and client access that is independent of any operating system or proprietary protocol. In addition the device server is a "closed box," delivering extreme ease of installation, minimal maintenance, and can be managed by the client remotely via a web browser.
By virtue of its independent operating system, protocol independence, small size and flexibility, device servers are able to meet the demands of virtually any network-enabling application. The demand for device servers is rapidly increasing because organizations need to leverage their networking infrastructure investment across all of their resources. Many currently installed devices lack network ports or require dedicated serial connections for management -- device servers allow those devices to become connected to the network.
Device servers are currently used in a wide variety of environments in which machinery, instruments, sensors and other discrete devices generate data that was previously inaccessible through enterprise networks. They are also used for security systems, point-of-sale applications, network management and many other applications where network access to a device is required.
As device servers become more widely adopted and implemented into specialized applications, we can expect to see variations in size, mounting capabilities and enclosures. Device servers are also available as embedded devices, capable of providing instant networking support for developers of future products where connectivity will be required.
Print servers, terminal servers, remote access servers and network time servers are examples of device servers which are specialized for particular functions. Each of these types of servers has unique configuration attributes in hardware or software that help them to perform best in their particular arena.

External Device Servers

External device servers are stand-alone serial-to-wireless (802.11b) or serial-to-Ethernet device servers that can put just about any device with serial connectivity on the network in a matter of minutes so it can be managed remotely.

External Device Servers from Lantronix

Lantronix external device servers provide the ability to remotely control, monitor, diagnose and troubleshoot equipment over a network or the Internet. By opting for a powerful external device with full network and web capabilities, companies are able to preserve their present equipment investments.
Lantronix offers a full line of external device servers: Ethernet or wireless, advanced encryption for maximum security, and device servers designed for commercial or heavy-duty industrial applications.

Wireless:: Providing a whole new level of flexibility and mobility, these devices allow users to connect devices that are inaccessible via cabling. Users can also add intelligence to their businesses by putting mobile devices, such as medical instruments or warehouse equipment, on networks.
Security:: Ideal for protecting data such as business transactions, customer information, financial records, etc., these devices provide enhanced security for networked devices.
Commercial:: These devices enable users to network-enable their existing equipment (such as POS devices, AV equipment, medical instruments, etc.) simply and cost-effectively, without the need for special software.
Industrial:: For heavy-duty factory applications, Lantronix offers a full complement of industrial-strength external device servers designed for use with manufacturing, assembly and factory automation equipment. All models support Modbus industrial protocols.

Embedded Device Servers

Embedded device servers integrate all the required hardware and software into a single embedded device. They use a device’s serial port to web-enable or network-enable products quickly and easily without the complexities of extensive hardware and software integration. Embedded device servers are typically plug-and-play solutions that operate independently of a PC and usually include a wireless or Ethernet connection, operating system, an embedded web server, a full TCP/IP protocol stack, and some sort of encryption for secure communications.

Embedded Device Servers from Lantronix

Lantronix recognizes that design engineers are looking for a simple, cost-effective and reliable way to seamlessly embed network connectivity into their products. In a fraction of the time it would take to develop a custom solution, Lantronix embedded device servers provide a variety of proven, fully integrated products. OEMs can add full Ethernet and/or wireless connectivity to their products so they can be managed over a network or the Internet.

Module:: These devices allow users tonetwork-enable just about any electronic device with Ethernet and/or wireless connectivity.
Board-Level:: Users can integrate networking capabilities onto the circuit boards of equipment like factory machinery, security systems and medical devices.
Single-Chip Solutions:: These powerful, system-on-chip solutions help users address networking issues early in the design cycle to support the most popular embedded networking technologies.

Terminal Servers

Terminal servers are used to enable terminals to transmit data to and from host computers across LANs, without requiring each terminal to have its own direct connection. And while the terminal server's existence is still justified by convenience and cost considerations, its inherent intelligence provides many more advantages. Among these is enhanced remote monitoring and control. Terminal servers that support protocols like SNMP make networks easier to manage.
Devices that are attached to a network through a server can be shared between terminals and hosts at both the local site and throughout the network. A single terminal may be connected to several hosts at the same time (in multiple concurrent sessions), and can switch between them. Terminal servers are also used to network devices that have only serial outputs. A connection between serial ports on different servers is opened, allowing data to move between the two devices.
Given its natural translation ability, a multi-protocol server can perform conversions between the protocols it knows such as LAT and TCP/IP. While server bandwidth is not adequate for large file transfers, it can easily handle host-to-host inquiry/response applications, electronic mailbox checking, etc. In addition, it is far more economical than the alternatives -- acquiring expensive host software and special-purpose converters. Multiport device and print servers give users greater flexibility in configuring and managing their networks.
Whether it is moving printers and other peripherals from one network to another, expanding the dimensions of interoperability or preparing for growth, terminal servers can fulfill these requirements without major rewiring. Today, terminal servers offer a full range of functionality, ranging from 8 to 32 ports, giving users the power to connect terminals, modems, servers and virtually any serial device for remote access over IP networks.

Print Servers

Print servers enable printers to be shared by other users on the network. Supporting either parallel and/or serial interfaces, a print server accepts print jobs from any person on the network using supported protocols and manages those jobs on each appropriate printer.
The earliest print servers were external devices, which supported printing via parallel or serial ports on the device. Typically, only one or two protocols were supported. The latest generations of print servers support multiple protocols, have multiple parallel and serial connection options and, in some cases, are small enough to fit directly on the parallel port of the printer itself. Some printers have embedded or internal print servers. This design has an integral communication benefit between printer and print server, but lacks flexibility if the printer has physical problems.
Print servers generally do not contain a large amount of memory; printers simply store information in a queue. When the desired printer becomes available, they allow the host to transmit the data to the appropriate printer port on the server. The print server can then simply queue and print each job in the order in which print requests are received, regardless of protocol used or the size of the job.

Device Server Technology in the Data Center

The IT/data center is considered the pulse of any modern business. Remote management enables users to monitor and manage global networks, systems and IT equipment from anywhere and at any time. Device servers play a major role in allowing for the remote capabilities and flexibility required for businesses to maximize personnel resources and technology ROI.

Console Servers

Console servers provide the flexibility of both standard and emergency remote access via attachment to the network or to a modem. Remote console management serves as a valuable tool to help maximize system uptime and system operating costs.
Secure console servers provide familiar tools to leverage the console or emergency management port built into most serial devices, including servers, switches, routers, telecom equipment - anything in a rack - even if the network is down. They also supply complete in-band and out-of-band local and remote management for the data center with tools such as telnet and SSH that help manage the performance and availability of critical business information systems.

Console Management Solutions from Lantronix

Lantronix provides complete in-band and out-of-band local and remote management solutions for the data center. Lantronix secure console management products give IT managers unsurpassed ability to securely and remotely manage serial devices, including servers, switches, routers, telecom equipment - anything in a rack - even if the network is down.

Conclusion

The ability to manage virtually any electronic device over a network or the Internet is changing the way the world works and does business. With the ability to remotely manage, monitor, diagnose and control equipment, a new level of functionality is added to networking — providing business with increased intelligence and efficiency. Lantronix leads the way in developing new network intelligence and has been a tireless pioneer in machine-to-machine (M2M) communication technology.
We hope this introduction to networking has been helpful and informative. This tutorial was meant to be an overview and not a comprehensive guide that explains everything there is to know about planning, installing, administering and troubleshooting a network. There are many Internet websites, books and magazines available that explain all aspects of computer networks, from LANs to WANs, network hardware to running cable. To learn about these subjects in greater detail, check your local bookstore, software retailer or newsstand for more information.

Fast Ethernet Tutorial

A Guide to Using Fast Ethernet and Gigabit Ethernet

Network managers today must contend with the requirements of utilizing faster media, mounting bandwidth and play “traffic cop” to an ever-growing network infrastructure. Now, more than ever, it’s imperative for them to understand the basics of using various Ethernet technologies to manage their networks.
This tutorial will explain the basic principles of Fast Ethernet and Gigabit Ethernet technologies, describing how each improves on basic Ethernet technology. It will offer guidance on how to implement these technologies as well as some “rules of the road” for successful repeater selection and usage.

Introduction to Ethernet, Fast Ethernet and Gigabit Ethernet

It is nearly impossible to discuss networking without the mention of Ethernet, Fast Ethernet and Gigabit Ethernet. But, in order to determine which form is needed for your application, it’s important to first understand what each provides and how they work together.
A good starting point is to explain what Ethernet is. Simply, Ethernet is a very common method of networking computers in a LAN using copper cabling. Capable of providing fast and constant connections, Ethernet can handle about 10,000,000 bits per second and can be used with almost any kind of computer.
While that may sound fast to those less familiar with networking, there is a very strong demand for even higher transmission speeds, which has been realized by the Fast Ethernet and Gigabit Ethernet specifications (IEEE 802.3u and IEEE 802.3z respectively). These LAN (local area network) standards have raised the Ethernet speed limit from 10 megabits per second (Mbps) to 100Mbps for Fast Ethernet and 1000Mbps for Gigabit Ethernet with only minimal changes made to the existing cable structure.
The building blocks of today's networks call out for a mixture of legacy 10BASE-T Ethernet networks and the new protocols. Typically, 10Mbps networks utilize Ethernet switches to improve the overall efficiency of the Ethernet network. Between Ethernet switches, Fast Ethernet repeaters are used to connect a group of switches together at the higher 100 Mbps rate.
However, with an increasing number of users running 100Mbps at the desktop, servers and aggregation points such as switch stacks may require even greater bandwidth. In this case, a Fast Ethernet backbone switch can be upgraded to a Gigabit Ethernet switch which supports multiple 100/1000 Mbps switches. High performance servers can be connected directly to the backbone once it has been upgraded.

Integrating Fast Ethernet and Gigabit Ethernet

Many client/server networks suffer from too many clients trying to access the same server, which creates a bottleneck where the server attaches to the LAN. Fast Ethernet, in combination with switched Ethernet, can create an optimal cost-effective solution for avoiding slow networks since most 10/100Mbps components cost about the same as 10Mbps-only devices.
When integrating 100BASE-T into a 10BASE-T network, the only change required from a wiring standpoint is that the corporate premise distributed wiring system must now include Category 5 (CAT5) rated twisted pair cable in the areas running 100BASE-T. Once rewiring is completed, gigabit speeds can also be deployed even more widely throughout the network using standard CAT5 cabling.
The Fast Ethernet specification calls for two types of transmission schemes over various wire media. The first is 100BASE-TX, which, from a cabling perspective, is very similar to 10BASE-T. It uses CAT5-rated twisted pair copper cable to connect various hubs, switches and end-nodes. It also uses an RJ45 jack just like 10BASE-T and the wiring at the connector is identical. These similarities make 100BASE-TX easier to install and therefore the most popular form of the Fast Ethernet specification.
The second variation is 100Base-FX which is used primarily to connect hubs and switches together either between wiring closets or between buildings. 100BASE-FX uses multimode fiber-optic cable to transport Fast Ethernet traffic.
Gigabit Ethernet specification calls for three types of transmission schemes over various wire media. Gigabit Ethernet was originally designed as a switched technology and used fiber for uplinks and connections between buildings. Because of this, in June 1998 the IEEE approved the Gigabit Ethernet standard over fiber: 1000BASE-LX and 1000BASE-SX.
The next Gigabit Ethernet standardization to come was 1000BASE-T, which is Gigabit Ethernet over copper. This standard allows one gigabit per second (Gbps) speeds to be transmitted over CAT5 cable and has made Gigabit Ethernet migration easier and more cost-effective than ever before.

Rules of the Road

The basic building block for the Fast Ethernet LAN is the Fast Ethernet repeater. The two types of Fast Ethernet repeaters offered on the market today are:
Class I Repeater -- The Class 1 repeater operates by translating line signals on the incoming port to a digital signal. This allows the translation between different types of Fast Ethernet such as 100BASE-TX and 100BASE-FX. A Class I repeater introduces delays when performing this conversion such that only one repeater can be put in a single Fast Ethernet LAN segment.
Class II Repeater -- The Class II repeater immediately repeats the signal on an incoming port to all the ports on the repeater. Very little delay is introduced by this quick movement of data across the repeater; thus two Class II repeaters are allowed per Fast Ethernet segment.
Network managers understand the 100 meter distance limitation of 10BASE-T and 100BASE-T Ethernet and make allowances for working within these limitations. At the higher operating speeds, Fast Ethernet and 1000BASE-T are limited to 100 meters over CAT5-rated cable. The EIA/TIA cabling standard recommends using no more than 90 meters between the equipment in the wiring closet and the wall connector. This allows another 10 meters for patch cables between the wall and the desktop computer.
In contrast, a Fast Ethernet network using the 100BASE-FX standard is designed to allow LAN segments up to 412 meters in length. Even though fiber-optic cable can actually transmit data greater distances (i.e. 2 Kilometers in FDDI), the 412 meter limit for Fast Ethernet was created to allow for the round trip times of packet transmission. Typical 100BASE-FX cable specifications call for multimode fiber-optic cable with a 62.5 micron fiber-optic core and a 125 micron cladding around the outside. This is the most popular fiber optic cable type used by many of the LAN standards today. Connectors for 100BASE-FX Fast Ethernet are typically ST connectors (which look like Ethernet BNC connectors).
Many Fast Ethernet vendors are migrating to the newer SC connectors used for ATM over fiber. A rough implementation guideline to use when determining the maximum distances in a Fast Ethernet network is the equation: 400 - (r x 95) where r is the number of repeaters. Network managers need to take into account the distance between the repeaters and the distance between each node from the repeater. For example, in Figure 1 two repeaters are connected to two Fast Ethernet switches and a few servers.
Figure 1: Fast Ethernet Distance Calculations with Two Repeaters

Maximum Distance Between End nodes:
400-(rx95) where r = 2 (for 2 repeaters)
400-(2x95) = 400-190 = 210 feet, thus
A + B + C = 210 Feet

There is yet another variation of Ethernet called full-duplex Ethernet. Full-duplex Ethernet enables the connection speed to be doubled by simply adding another pair of wires and removing collision detection; the Fast Ethernet standard allowed full-duplex Ethernet. Until then all Ethernet worked in half-duplex mode which meant if there were only two stations on a segment, both could not transmit simultaneously. With full-duplex operation, this was now possible. In the terms of Fast Ethernet, essentially 200Mbps of throughput is the theoretical maximum per full-duplex Fast Ethernet connection. This type of connection is limited to a node-to-node connection and is typically used to link two Ethernet switches together.
A Gigabit Ethernet network using the 1000BASE-LX long wavelength option supports duplex links of up to 550 meters of 62.5 millimeters or 50 millimeters multimode fiber. 1000BASE-LX can also support up to 5 Kilometers of 10 millimeter single-mode fiber. Its wavelengths range from 1270 millimeters to 1355 millimeters. The 1000BASE-SX is a short wavelength option that supports duplex links of up to 275 meters using 62.5 millimeters at multimode or up to 550 meters using 55 millimeters of multimode fiber. Typical wavelengths for this option are in the range of 770 to 860 nanometers.

Maintaining a Quality Network

The CAT5 cable specification is rated up to 100 megahertz (MHz) and meets the requirement for high speed LAN technologies like Fast Ethernet and Gigabit Ethernet. The EIA/TIA (Electronics industry Association/Telecommunications Industry Association) formed this cable standard which describes performance the LAN manager can expect from a strand of twisted pair copper cable. Along with this specification, the committee formed the EIA/TIA-568 standard named the “Commercial Building Telecommunications Cabling Standard” to help network managers install a cabling system that would operate using common LAN types (like Fast Ethernet). The specification defines Near End Crosstalk (NEXT) and attenuation limits between connectors in a wall plate to the equipment in the closet. Cable analyzers can be used to ensure accordance with this specification and thus guarantee a functional Fast Ethernet or Gigabit Ethernet network.
The basic strategy of cabling Fast Ethernet systems is to minimize the re-transmission of packets caused by high bit-error rates. This ratio is calculated using NEXT, ambient noise and attenuation of the cable.

Fast Ethernet Migration

Most network managers have already migrated from 10BASE-T or other Ethernet 10Mbps variations to higher bandwidth networks. Fast Ethernet ports on Ethernet switches are used to provide even greater bandwidth between the workgroups at 100Mbps speeds. New backbone switches have been created to offer support for 1000Mbps Gigabit Ethernet uplinks to handle network traffic. Equipment like Fast Ethernet repeaters will be used in common areas to group Ethernet switches together with server farms into large 100Mbps pipes. This is currently the most cost effective method of growing networks within the average enterprise.

Device Servers Tutorial

Device Server Technology -
Understanding and Imagining its Possibilities

For easy reference, please consult the glossary of terms at the end of this paper.*

The ability to manage virtually any electronic device over a network or the Internet is changing our world. Companies want to remotely manage, monitor, diagnose and control their equipment because doing so adds an unprecedented level of intelligence and efficiency to their businesses.
With this trend, and as we rely on applications like e-mail and database management for core business operations, the need for more fully-integrated devices and systems to monitor and manage the vast amount of data and information becomes increasingly more important. And, in a world where data and information is expected to be instantaneous, the ability to manage, monitor and even repair equipment from a distance is extremely valuable to organizations in every sector.
This need is further emphasized as companies with legacy non-networked equipment struggle to compete with organizations equipped with advanced networking capabilities such as machine-to-machine (M2M) communications. There’s no denying that advanced networking provides an edge to improving overall efficiencies.
This tutorial will provide an overview and give examples of how device servers make it easy to put just about any piece of electronic equipment on an Ethernet network. It will highlight the use of external device servers and their ability to provide serial connectivity for a variety of applications. It will touch on how device networking makes M2M communication possible and wireless technology even more advanced. Finally, as any examination of networking technologies requires consideration of data security, this paper will provide an overview of some the latest encryption technologies available for connecting devices securely to the network.

Moving from Serial to EthernetAn Introduction to Device Server Technology

For some devices, the only access available to a network manager or programmer is via a serial port. The reason for this is partly historical and partly evolutionary. Historically, Ethernet interfacing has usually been a lengthy development process involving multiple vendor protocols (some of which have been proprietary) and the interpretation of many RFCs. Some vendors believed Ethernet was not necessary for their product which was destined for a centralized computer center - others believed that the development time and expense required to have an Ethernet interface on the product was not justified.
From the evolutionary standpoint, the networking infrastructure of many sites has only recently been developed to the point that consistent and perceived stability has been obtained - as users and management have become comfortable with the performance of the network, they now focus on how they can maximize corporate productivity in non-IS capacities.
Device server technology solves this problem by providing an easy and economical way to connect the serial device to the network.
Let's use the Lantronix UDS100 Device Server as an example of how to network a RAID controller serial port. The user simply cables the UDS100 's serial port to the RAID controller's serial port and attaches the UDS100's Ethernet interface to the network. Once it has been configured, the UDS100 makes that serial port a networked port, with its own IP address. The user can now connect to the UDS100 's serial port over a network, from a PC or terminal emulation device and perform the same commands as if he was using a PC directly attached to the RAID controller. Having now become network enabled, the RAID can be managed or controlled from anywhere on the network or via the Internet.
The key to network-enabling serial equipment is in a device server’s ability to handle two separate areas:

the connection between the serial device and the device server
the connection between the device server and the network (including other network devices)

Traditional terminal, print and serial servers were developed specifically for connecting terminals, printers and modems to the network and making those devices available as networked devices. Now, more modern demands require other devices be network-enabled, and therefore device servers have become more adaptable in their handling of attached devices. Additionally, they have become even more powerful and flexible in the manner in which they provide network connectivity.

Device Servers Defined

A device server is “a specialized network-based hardware device designed to perform a single or specialized set of functions with client access independent of any operating system or proprietary protocol.”
Device servers allow independence from proprietary protocols and the ability to meet a number of different functions. The RAID controller application discussed above is just one of many applications where device servers can be used to put any device or "machine" on the network.
PCs have been used to network serial devices with some success. This, however, required the product with the serial port to have software able to run on the PC, and then have that application software allow the PC's networking software to access the application. This task equaled the problems of putting Ethernet on the serial device itself so it wasn’t a satisfactory solution.
To be successful, a device server must provide a simple solution for networking a device and allow access to that device as if it were locally available through its serial port. Additionally, the device server should provide for the multitude of connection possibilities that a device may require on both the serial and network sides of a connection. Should the device be connected all the time to a specific host or PC? Are there multiple hosts or network devices that may want or need to connect to the newly-networked serial device? Are there specific requirements for an application which requires the serial device to reject a connection from the network under certain circumstances? The bottom line is a server must have both the flexibility to service a multitude of application requirements and be able to meet all the demands of those applications.

Capitalizing on Lantronix Device Server Expertise and Proven Solutions

Lantronix is at the forefront of M2M communication technology. The company is highly focused on enabling the networking of devices previously not on the network so they can be accessed and managed remotely.

Lantronix has built on its long history and vast experience as a terminal, print and serial server technology company to develop more functionality in its servers that “cross the boundary” of what many would call traditional terminal or print services. Our technology provides:

The ability to translate between different protocols to allow non-routable protocols to be routed
The ability to allow management connections to single-port servers while they are processing transactions between their serial port and the network
A wide variety of options for both serial and network connections including serial tunneling and automatic host connection make these servers some of the most sophisticated Ethernet-enabling devices available today.

Ease of Use

As an independent device on the network, device servers are surprisingly easy to manage. Lantronix has spent years perfecting Ethernet protocol software and its engineers have provided a wide range of management tools for this device server technology. Serial ports are ideal vehicles for device management purposes - a simple command set allows easy configuration. The same command set that can be exercised on the serial port can be used when connecting via Telnet to a Lantronix device server.
An important feature to remember about the Lantronix Telnet management interface is that it can actually be run as a second connection while data is being transferred through the server - this feature allows the user to actually monitor the data traffic on even a single-port server's serial port connection while active. Lantronix device servers also support SNMP, the recognized standard for IP management that is used by many large network for management purposes.
Finally, Lantronix has its own management software utilities which utilize a graphical user interface providing an easy way to manage Lantronix device servers. In addition, the servers all have Flash ROMs which can be reloaded in the field with the latest firmware.

Device Servers for a Host of Applications

This section will discuss how device servers are used to better facilitate varying applications such as:

Data Acquisition
M2M
Wireless Communication/Networking
Factory/Industrial Automation
Security Systems
Bar Code Readers and Point-of-sale Scanners
Medical Applications

Data Acquisition

Microprocessors have made their way into almost all aspects of human life, from automobiles to hockey pucks. With so much data available, organizations are challenged to effectively and efficiently gather and process the information. There are a wide variety of interfaces to support communication with devices. RS-485 is designed to allow for multiple devices to be linked by a multidrop network of RS-485 serial devices. This standard also had the benefit of greater distance than offered by the RS-232/RS-423 and RS-422 standards.
However, because of the factors previously outlined, these types of devices can further benefit from being put on an Ethernet network. First, Ethernet networks have a greater range than serial technologies. Second, Ethernet protocols actually monitor packet traffic and will indicate when packets are being lost compared to serial technologies which do not guarantee data integrity.
Lantronix full family of device server products provides the comprehensive support required for network enabling different serial interfaces. Lantronix provides many device servers which support RS-485 and allow for easy integration of these types of devices into the network umbrella. For RS-232 or RS-423 serial devices, they can be used to connect equipment to the network over either Ethernet or Fast Ethernet.

An example of device server collaboration at work is Lantronix's partnership with Christie Digital Systems, a leading provider of visual solutions for business, entertainment and industry. Christie integrates Lantronix SecureBox® secure device server with feature-rich firmware designed and programmed by Christie for its CCM products. The resulting product line, called the ChristieNET SecureCCM, provided the encryption security needed for use in the company’s key markets, which include higher education and government. Demonstrating a convergence of AV and IT equipment to solve customer needs, ChristieNET SecureCCM was the first product of its kind to be certified by the National Institute of Standards and Technology (NIST).

M2M and Wireless Communications

Two extremely important and useful technologies for communication that depend heavily on device servers are M2M and wireless networking.
Made possible by device networking technology, M2M enables serial-based devices throughout a facility to communicate with each other and humans over a Local Area Network/Wide Area Network (LAN/WAN) or via the Internet. The prominent advantages to business include:

Maximized efficiency
More streamlined operations
Improved service

Lantronix Device Servers enable M2M communications either between the computer and serial device, or from one serial device to another over the Internet or Ethernet network using “serial tunneling.” Using thisserial to Ethernet method, the “tunnel” can extend across a facility or to other facilities all over the globe.
M2M technology opens a new world of business intelligence and opportunity for organizations in virtually every market sector. Made possible through device servers, M2M offers solutions for equipment manufacturers, for example, who need to control service costs. Network enabled equipment can be monitored at all times for predictive maintenance. Often when something is wrong, a simple setting or switch adjustment is all that is required. When an irregularity is noted, the system can essentially diagnose the problem and send the corrective instructions. This negates a time-consuming and potentially expensive service call for a trivial issue. If servicing is required, the technician leaves knowing exactly what is wrong and with the proper equipment and parts to correct the problem. Profitability is maximized through better operating efficiencies, minimized cost overruns and fewer wasted resources.

M2M technology also greatly benefits any organization that cannot afford downtime, such as energy management facilities where power failures can be catastrophic, or hospitals who can’t afford interruptions with lives at stake. By proactively monitoring networked-enabled equipment to ensure it is functioning properly at all times, business can ensure uptime on critical systems, improve customer service and increase profitability.

Wireless Networking

Wireless networking, allows devices to communicate over the airwaves and without wires by using standard networking protocols. There are currently a variety of competing standards available for achieving the benefits of a wireless network. Here is a brief description of each:

Bluetooth: is a standard that provides short-range wireless connections between computers, Pocket PCs, and other equipment.
ZigBee: is a proprietary set of communication protocols designed to use small, low power digital radios based on the IEEE 802.15.4 standard for wireless personal area networking.
802.11: is an IEEE specification for a wireless LAN airlink.
802.11b (or Wi-Fi): is an industry standard for wireless LANs and supports more users and operates over longer distances than other standards. However, it requires more power and storage. 802.11b offers wireless transmission over short distances at up to 11 megabits per second. When used in handheld devices, 802.11b provides similar networking capabilities to devices enabled with Bluetooth.
802.11g: is the most recently approved standard and offers wireless transmission over short distances at up to 54 megabits per second. Both 802.11b and 802.11g operate in the 2.4 GHz range and are therefore compatible.

For more in-depth information, please consult the Lantronix wireless whitepaper which is available online.
Wireless technology is especially ideal in instances when it would be impractical or cost-prohibitive for cabling; or in instances where a high level of mobility is required.

Wireless device networking has benefits for all types of organizations. For example, in the medical field, where reduced staffing, facility closures and cost containment pressures are just a few of the daily concerns, device networking can assist with process automation and data security. Routine activities such as collection and dissemination of data, remote patient monitoring, asset tracking and reducing service costs can be managed quickly and safely with the use of wireless networked devices. In this environment, Lantronix device servers can network and manage patient monitoring devices, mobile EKG units, glucose analyzers, blood analyzers, infusion pumps, ventilators and virtually any other diagnostic tool with serial capability over the Internet.
Forklift accidents in large warehouses cause millions of dollars in damaged product, health claims, lost work and equipment repairs each year. To minimize the lost revenue and increase their profit margin and administrative overhead, “a company” has utilized wireless networking technology to solve the problem. Using Lantronix serial-to-802.11 wireless device server “the company” wirelessly network-enables a card reader which is tied to the ignition system of all the forklifts in the warehouse. Each warehouse employee has an identification card. The forklift operator swipes his ID card before trying to start the forklift. The information from his card is sent back via wireless network to computer database and it checks to see if he has proper operator’s license, and that the license is current. If so, forklift can start. If not – the starter is disabled.

Factory Floor Automation

For shops that are running automated assembly and manufacturing equipment, time is money. For every minute a machine is idle, productivity drops and the cost of ownership soars. Many automated factory floor machines have dedicated PCs to control them. In some cases, handheld PCs are used to reprogram equipment for different functions such as changing computer numerically controlled (CNC) programs or changing specifications on a bottling or packaging machine to comply with the needs of other products. These previously isolated pieces of industrial equipment could be networked to allow them to be controlled and reprogrammed over the network, saving time and increasing shop efficiency. For example, from a central location (or actually from anywhere in the world for that matter) with network connectivity, the machines can be accessed and monitored over the network. When necessary, new programs can be downloaded to the machine and software/firmware updates can be installed remotely.
One item of interest is how that input programming is formatted. Since many industrial and factory automation devices are legacy or proprietary, any number of different data protocols could be used. Device servers provide the ability to utilize the serial ports on the equipment for virtually any kind of data transaction.
Lantronix device servers support binary character transmissions. In these situations, managing the rate of information transfer is imperative to guard against data overflow. The ability to manage data flow between computers, devices or nodes in a network, so that data can be handled efficiently is referred to as flow control. Without it, the risk of data overflow can result in information being lost or needing to be retransmitted.
Lantronix accounts for this need by supporting RTS/CTS flow control on its DB25 and RJ45 ports. Lantronix device servers handle everything from a simple ASCII command file to a complex binary program that needs to be transmitted to a device.

Security Systems

One area that every organization is concerned about is security. Card readers for access control are commonplace, and these devices are ideally suited to benefit from being connected to the network with device server technology. When networked, the cards can be checked against a centralized database on the system and there are records of all access within the organization. Newer technology includes badges that can be scanned from a distance of up to several feet and biometric scanning devices that can identify an individual by a thumbprint or handprint. Device servers enable these types of devices to be placed throughout an organization's network and allow them to be effectively managed by a minimum staff at a central location. They allow the computer controlling the access control to be located a great distance away from the actual door control mechanism.
An excellent example is how ISONAS Security Systems utilized Lantonix WiPort® embedded device server to produce the World’s first wireless IP door reader for the access control and security industry. With ISONAS reader software, network administrators can directly monitor and control an almost unlimited number of door readers across the enterprise. The new readers, incorporating Lantronix wireless technology, connect directly to an IP network and eliminate the need for traditional security control panels and expensive wiring. The new solutions are easy to install and configure, enabling businesses to more easily adopt access control, time and attendance or emergency response technology. What was traditionally a complicated configuration and installation is now as simple as installing wireless access points on a network.
One more area of security systems that has made great strides is in the area of security cameras. In some cases, local municipalities are now requesting that they get visual proof of a security breach before they will send authorities. Device server technology provides the user with a host of options for how such data can be handled. One option is to have an open data pipe on a security camera - this allows all data to be viewed as it comes across from the camera. The device server can be configured so that immediately upon power-up the serial port attached to the camera will be connected to a dedicated host system.
Another option is to have the camera transmit only when it has data to send. By configuring the device server to automatically connect to a particular site when a character first hits the buffer, data will be transmitted only when it is available.
One last option is available when using the IP protocol - a device server can be configured to transmit data from one serial device to multiple IP addresses for various recording or archival concerns. Lantronix device server technology gives the user many options for tuning the device to meet the specific needs of their application.

Scanning Devices

Device server technology can be effectively applied to scanning devices such as bar code readers or point-of-sale debit card scanners. When a bar code reader is located in a remote corner of the warehouse at a receiving dock, a single-port server can link the reader to the network and provide up-to-the-minute inventory information. A debit card scanner system can be set up at any educational, commercial or industrial site with automatic debiting per employee for activities, meals and purchases. A popular amusement park in the United States utilizes such a system to deter theft or reselling of partially-used admission tickets.

Medical Applications

The medical field is an area where device server technology can provide great flexibility and convenience. Many medical organizations now run comprehensive applications developed specifically for their particular area of expertise. For instance, a group specializing in orthopedics may have x-ray and lab facilities onsite to save time and customer effort in obtaining test results. Connecting all the input terminals, lab devices, x-ray machines and developing equipment together allows for efficient and effective service. Many of these more technical devices previously relied upon serial communication or worse yet, processing being done locally on a PC. Utilizing device server technology they can all be linked together into one seamless application. And an Internet connection enables physicians the added advantage of access to immediate information relevant to patient diagnosis and treatment.
Larger medical labs, where there are hundreds of different devices available for providing test data, can improve efficiency and lower equipment costs by using device server technology to replace dedicated PCs at each device. Device servers only cost a fraction of PCs. And, the cost calculation is not just the hardware alone, but the man-hours required to create software that would allow a PC-serial-port-based applications program to be converted into a program linking that information to the PC's network port. Device server technology resolves this issue by allowing the original applications software to be run on a networked PC and then use port redirector software to connect up to that device via the network. This enables the medical facility to transition from a PC at each device and software development required to network that data, to using only a couple of networked PCs doing the processing for all of the devices.

Additional Network Security

Of course, with the ability to network devices comes the risk of outsiders obtaining access to important and confidential information. Security can be realized through various encryption methods.
There are two main types of encryption: asymmetric encryption (also known as public-key encryption) and symmetric encryption. There are many algorithms for encrypting data based on these types.

AES: AES (Advanced Encryption Standards) is a popular and powerful encryption standard that has not been broken. Select Lantronix device servers feature a NIST-certified implementation of AES as specified by the Federal Information Processing Specification (FIPS-197). This standard specifiesRijndael as a FIPS-approved symmetric encryption algorithm that may be used to protect sensitive information. A common consideration for device networking devices is that they support AES and are validated against the standard to demonstrate that they properly implement the algorithm. It is important that a validation certificate is issued to the product’s vendor which states that the implementation has been tested. Lantronix offers several AES certified devices including the AES Certified SecureBox SDS1100 and the AES Certified SecureBox SDS2100.
Secure Shell Encryption: Secure Shell (SSH) is a program that provides strong authentication and secure communications over unsecured channels. It is used as a replacement for Telnet, rlogin, rsh, and rcp, to log into another computer over a network, to execute commands in a remote machine, and to move files from one machine to another. AES is one of the many encryption algorithms supported by SSH. Once a session key is established SSH uses AES to protect data in transit.
Both SSH and AES are extremely important to overall network security by maintaining strict authentication for protection against intruders as well as symmetric encryption to protect transmission of dangerous packets. AES certification is reliable and can be trusted to handle the highest network security issues.
WEP: Wired Equivalent Privacy (WEP) is a security protocol for wireless local area networks (WLANs) which are defined in the 802.11b standard. WEP is designed to provide the same level of security as that of a wired LAN, however LANs provide more security by their inherent physical structure that can be protected from unauthorized access. WLANs, which are over radio waves, do not have the same physical structure and therefore are more vulnerable to tampering. WEP provides security by encrypting data over radio waves so that it is protected as it is transmitted from one end point to another. However, it has been found that WEP is not as secure as once believed. WEP is used at the data link and physical layers of the OSI model and does not offer end-to-end security.
WPA: Supported by many newer devices, Wi-Fi Protected Access (WPA) is a Wi-Fi standard that was designed to improve upon the security features of WEP. WPA technology works with existing Wi-Fi products that have been enabled with WEP, but WPA includes two improvements over WEP. The first is improved data encryption via the temporal key integrity protocol (TKIP), which scrambles keys using a hashing algorithm and adds an integrity-checking feature to ensure that keys haven’t been tampered with. The second is user authentication through the extensible authentication protocol (EAP). EAP is built on a secure public-key encryption system, ensuring that only authorized network users have access. EAP is generally missing from WEP, which regulates access to a wireless network based on the computer’s hardware-specific MAC Address. Since this information can be easily stolen, there is an inherent security risk in relying on WEP encryption alone.

Incorporating Encryption with Device Servers

In the simplest connection scheme where two device servers are set up as a serial tunnel, no encryption application programming is required since both device servers can perform the encryption automatically. However, in the case where a host-based application is interacting with the serial device through its own network connection, modification of the application is required to support data encryption.

Applications Abound

While this paper provides a quick snapshot of device servers at work in a variety of applications, it should be noted that this is only a sampling of the many markets where these devices could be used. With the ever-increasing requirement to manage, monitor, diagnose and control many and different forms of equipment and as device server technology continues to evolve, the applications are literally only limited by the imagination.

Glossary of terms *

Serial server

traditionally, a unit used for connecting a modem to the network for shared access among users.

Terminal server

traditionally, a unit that connects asynchronous devices such as terminals, printers, hosts, and modems to a LAN or WAN.

Device server

a specialized network-based hardware device designed to perform a single or specialized set of functions with client access independent of any operating system or proprietary protocol.

Print server

a host device that connects and manages shared printers over a network.

Console server

software that allows the user to connect consoles from various equipment into the serial ports of a single device and gain access to these consoles from anywhere on the network.

Console manager

a unit or program that allows the user to remotely manage serial devices, including servers, switches, routers and telecom equipment.

Network Switching Tutorial

Network Switching

Switches can be a valuable asset to networking. Overall, they can increase the capacity and speed of your network. However, switching should not be seen as a cure-all for network issues. Before incorporating network switching, you must first ask yourself two important questions: First, how can you tell if your network will benefit from switching? Second, how do you add switches to your network design to provide the most benefit?
This tutorial is written to answer these questions. Along the way, we'll describe how switches work, and how they can both harm and benefit your networking strategy. We’ll also discuss different network types, so you can profile your network and gauge the potential benefit of network switching for your environment.

What is a Switch?

Switches occupy the same place in the network as hubs. Unlike hubs, switches examine each packet and process it accordingly rather than simply repeating the signal to all ports. Switches map the Ethernet addresses of the nodes residing on each network segment and then allow only the necessary traffic to pass through the switch. When a packet is received by the switch, the switch examines the destination and source hardware addresses and compares them to a table of network segments and addresses. If the segments are the same, the packet is dropped or "filtered"; if the segments are different, then the packet is "forwarded" to the proper segment. Additionally, switches prevent bad or misaligned packets from spreading by not forwarding them.
Filtering packets and regenerating forwarded packets enables switching technology to split a network into separate collision domains. The regeneration of packets allows for greater distances and more nodes to be used in the total network design, and dramatically lowers the overall collision rates. In switched networks, each segment is an independent collision domain. This also allows for parallelism, meaning up to one-half of the computers connected to a switch can send data at the same time. In shared networks all nodes reside in a single shared collision domain.
Easy to install, most switches are self learning. They determine the Ethernet addresses in use on each segment, building a table as packets are passed through the switch. This "plug and play" element makes switches an attractive alternative to hubs.
Switches can connect different network types (such as Ethernet and Fast Ethernet) or networks of the same type. Many switches today offer high-speed links, like Fast Ethernet, which can be used to link the switches together or to give added bandwidth to important servers that get a lot of traffic. A network composed of a number of switches linked together via these fast uplinks is called a "collapsed backbone" network.
Dedicating ports on switches to individual nodes is another way to speed access for critical computers. Servers and power users can take advantage of a full segment for one node, so some networks connect high traffic nodes to a dedicated switch port.
Full duplex is another method to increase bandwidth to dedicated workstations or servers. To use full duplex, both network interface cards used in the server or workstation and the switch must support full duplex operation. Full duplex doubles the potential bandwidth on that link.

Network Congestion

The Factors Affecting Network Efficiency

Amount of traffic
Number of nodes
Size of packets
Network diameter

Measuring Network Efficiency

Average to peak load deviation
Collision Rate
Utilization Rate

Utilization rate is another widely accessible statistic about the health of a network. This statistic is available in Novell's console monitor and WindowsNT performance monitor as well as any optional LAN analysis software. Utilization in an average network above 35 percent indicates potential problems. This 35 percent utilization is near optimum, but some networks experience higher or lower utilization optimums due to factors such as packet size and peak load deviation.
A switch is said to work at "wire speed" if it has enough processing power to handle full Ethernet speed at minimum packet sizes. Most switches on the market are well ahead of network traffic capabilities supporting the full "wire speed" of Ethernet, 14,480 pps (packets per second), and Fast Ethernet, 148,800 pps.

Routers

Routers work in a manner similar to switches and bridges in that they filter out network traffic. Rather than doing so by packet addresses, they filter by specific protocol. Routers were born out of the necessity for dividing networks logically instead of physically. An IP router can divide a network into various subnets so that only traffic destined for particular IP addresses can pass between segments. Routers recalculate the checksum, and rewrite the MAC header of every packet. The price paid for this type of intelligent forwarding and filtering is usually calculated in terms of latency, or the delay that a packet experiences inside the router. Such filtering takes more time than that exercised in a switch or bridge which only looks at the Ethernet address. In more complex networks network efficiency can be improved. An additional benefit of routers is their automatic filtering of broadcasts, but overall they are complicated to setup.

Switch Benefits

Isolates traffic, relieving congestion
Separates collision domains, reducing collisions
Segments, restarting distance and repeater rules

Switch Costs

Price: currently 3 to 5 times the price of a hub
Packet processing time is longer than in a hub
Monitoring the network is more complicated

General Benefits of Network Switching

Switches replace hubs in networking designs, and they are more expensive. So why is the desktop switching market doubling ever year with huge numbers sold? The price of switches is declining precipitously, while hubs are a mature technology with small price declines. This means that there is far less difference between switch costs and hub costs than there used to be, and the gap is narrowing.
Since switches are self learning, they are as easy to install as a hub. Just plug them in and go. And they operate on the same hardware layer as a hub, so there are no protocol issues.
There are two reasons for switches being included in network designs. First, a switch breaks one network into many small networks so the distance and repeater limitations are restarted. Second, this same segmentation isolates traffic and reduces collisions relieving network congestion. It is very easy to identify the need for distance and repeater extension, and to understand this benefit of network switching. But the second benefit, relieving network congestion, is hard to identify and harder to understand the degree by which switches will help performance. Since all switches add small latency delays to packet processing, deploying switches unnecessarily can actually slow down network performance. So the next section pertains to the factors affecting the impact of switching to congested networks.

Network Switching

The benefits of switching vary from network to network. Adding a switch for the first time has different implications than increasing the number of switched ports already installed. Understanding traffic patterns is very important to network switching - the goal being to eliminate (or filter) as much traffic as possible. A switch installed in a location where it forwards almost all the traffic it receives will help much less than one that filters most of the traffic.
Networks that are not congested can actually be negatively impacted by adding switches. Packet processing delays, switch buffer limitations, and the retransmissions that can result sometimes slows performance compared with the hub based alternative. If your network is not congested, don't replace hubs with switches. How can you tell if performance problems are the result of network congestion? Measure utilization factors and collision rates.

Good Candidates for Performance Boosts from Switching

Utilization more than 35%
Collision rates more than 10%

Utilization load is the amount of total traffic as a percent of the theoretical maximum for the network type, 10 Mbps in Ethernet, 100 Mbps in Fast Ethernet. The collision rate is the number of packets with collisions as a percentage of total packages

Network response times (the user-visible part of network performance) suffers as the load on the network increases, and under heavy loads small increases in user traffic often results in significant decreases in performance. This is similar to automobile freeway dynamics, in that increasing loads results in increasing throughput up to a point, then further increases in demand results in rapid deterioration of true throughput. In Ethernet, collisions increase as the network is loaded, and this causes retransmissions and increases in load which cause even more collisions. The resulting network overload slows traffic considerably.
Using network utilities found on most server operating systems network managers can determine utilization and collision rates. Both peak and average statistics should be considered.

Replacing a Central Hub with a Switch

This switching opportunity is typified by a fully shared network, where many users are connected in a cascading hub architecture. The two main impacts of switching will be faster network connection to the server(s) and the isolation of non-relevant traffic from each segment. As the network bottleneck is eliminated performance grows until a new system bottleneck is encountered - such as maximum server performance.

Adding Switches to a Backbone Switched Network

Congestion on a switched network can usually be relieved by adding more switched ports, and increasing the speed of these ports. Segments experiencing congestion are identified by their utilization and collision rates, and the solution is either further segmentation or faster connections. Both Fast Ethernet and Ethernet switch ports are added further down the tree structure of the network to increase performance.

Designing for Maximum Benefit

Changes in network design tend to be evolutionary rather than revolutionary-rarely is a network manager able to design a network completely from scratch. Usually, changes are made slowly with an eye toward preserving as much of the usable capital investment as possible while replacing obsolete or outdated technology with new equipment.
Fast Ethernet is very easy to add to most networks. A switch or bridge allows Fast Ethernet to connect to existing Ethernet infrastructures to bring speed to critical links. The faster technology is used to connect switches to each other, and to switched or shared servers to ensure the avoidance of bottlenecks.
Many client/server networks suffer from too many clients trying to access the same server which creates a bottleneck where the server attaches to the LAN. Fast Ethernet, in combination with switched Ethernet, creates the perfect cost-effective solution for avoiding slow client server networks by allowing the server to be placed on a fast port.
Distributed processing also benefits from Fast Ethernet and switching. Segmentation of the network via switches brings big performance boosts to distributed traffic networks, and the switches are commonly connected via a Fast Ethernet backbone.

Good Candidates for Performance Boosts from Switching

Important to know network demand per node
Try to group users with the nodes they communicate with most often on the same segment
Look for departmental traffic patterns
Avoid switch bottlenecks with fast uplinks
Move users switch between segments in an iterative process until all nodes seeing less than 35% utilization

Client/Server Traffic

Distributed Traffic

Advanced Switching Technology Issues

There are some technology issues with switching that do not affect 95% of all networks. Major switch vendors and the trade publications are promoting new competitive technologies, so some of these concepts are discussed here.

Managed or Unmanaged

Management provides benefits in many networks. Large networks with mission critical applications are managed with many sophisticated tools, using SNMP to monitor the health of devices on the network. Networks using SNMP or RMON (an extension to SNMP that provides much more data while using less network bandwidth to do so) will either manage every device, or just the more critical areas. VLANs are another benefit to management in a switch. A VLAN allows the network to group nodes into logical LANs that behave as one network, regardless of physical connections. The main benefit is managing broadcast and multicast traffic. An unmanaged switch will pass broadcast and multicast packets through to all ports. If the network has logical grouping that are different from physical groupings then a VLAN-based switch may be the best bet for traffic optimization.
Another benefit to management in the switches is Spanning Tree Algorithm. Spanning Tree allows the network manager to design in redundant links, with switches attached in loops. This would defeat the self learning aspect of switches, since traffic from one node would appear to originate on different ports. Spanning Tree is a protocol that allows the switches to coordinate with each other so that traffic is only carried on one of the redundant links (unless there is a failure, then the backup link is automatically activated). Network managers with switches deployed in critical applications may want to have redundant links. In this case management is necessary. But for the rest of the networks an unmanaged switch would do quite well, and is much less expensive.

Store-and-Forward vs. Cut-Through

LAN switches come in two basic architectures, cut-through and store-and-forward. Cut-through switches only examine the destination address before forwarding it on to its destination segment. A store-and-forward switch, on the other hand, accepts and analyzes the entire packet before forwarding it to its destination. It takes more time to examine the entire packet, but it allows the switch to catch certain packet errors and collisions and keep them from propagating bad packets through the network.
Today, the speed of store-and-forward switches has caught up with cut-through switches to the point where the difference between the two is minimal. Also, there are a large number of hybrid switches available that mix both cut-through and store-and-forward architectures.

Blocking vs. Non-Blocking Switches

Take a switch's specifications and add up all the ports at theoretical maximum speed, then you have the theoretical sum total of a switch's throughput. If the switching bus, or switching components cannot handle the theoretical total of all ports the switch is considered a "blocking switch". There is debate whether all switches should be designed non-blocking, but the added costs of doing so are only reasonable on switches designed to work in the largest network backbones. For almost all applications, a blocking switch that has an acceptable and reasonable throughput level will work just fine.
Consider an eight port 10/100 switch. Since each port can theoretically handle 200 Mbps (full duplex) there is a theoretical need for 1600 Mbps, or 1.6 Gbps. But in the real world each port will not exceed 50% utilization, so a 800 Mbps switching bus is adequate. Consideration of total throughput versus total ports demand in the real world loads provides validation that the switch can handle the loads of your network.

Switch Buffer Limitations

As packets are processed in the switch, they are held in buffers. If the destination segment is congested, the switch holds on to the packet as it waits for bandwidth to become available on the crowded segment. Buffers that are full present a problem. So some analysis of the buffer sizes and strategies for handling overflows is of interest for the technically inclined network designer.
In real world networks, crowded segments cause many problems, so their impact on switch consideration is not important for most users, since networks should be designed to eliminate crowded, congested segments. There are two strategies for handling full buffers. One is "backpressure flow control" which sends packets back upstream to the source nodes of packets that find a full buffer. This compares to the strategy of simply dropping the packet, and relying on the integrity features in networks to retransmit automatically. One solution spreads the problem in one segment to other segments, propagating the problem. The other solution causes retransmissions, and that resulting increase in load is not optimal. Neither strategy solves the problem, so switch vendors use large buffers and advise network managers to design switched network topologies to eliminate the source of the problem - congested segments.

Layer 3 Switching

A hybrid device is the latest improvement in internetworking technology. Combining the packet handling of routers and the speed of switching, these multilayer switches operate on both layer 2 and layer 3 of the OSI network model. The performance of this class of switch is aimed at the core of large enterprise networks. Sometimes called routing switches or IP switches, multilayer switches look for common traffic flows, and switch these flows on the hardware layer for speed. For traffic outside the normal flows, the multilayer switch uses routing functions. This keeps the higher overhead routing functions only where it is needed, and strives for the best handling strategy for each network packet.
Many vendors are working on high end multilayer switches, and the technology is definitely a "work in process". As networking technology evolves, multilayer switches are likely to replace routers in most large networks.

Network Switching Tutorial

noreply@blogger.com (Anonymous) — Tue, 14 Jan 2014 18:35:00 +0000

Network Switching

What is a Switch?

Network Congestion

The Factors Affecting Network Efficiency

Amount of traffic
Number of nodes
Size of packets
Network diameter

Measuring Network Efficiency

Average to peak load deviation
Collision Rate
Utilization Rate

Routers

Switch Benefits

Isolates traffic, relieving congestion
Separates collision domains, reducing collisions
Segments, restarting distance and repeater rules

Switch Costs

Price: currently 3 to 5 times the price of a hub
Packet processing time is longer than in a hub
Monitoring the network is more complicated

General Benefits of Network Switching

Network Switching

Good Candidates for Performance Boosts from Switching

Utilization more than 35%
Collision rates more than 10%

Replacing a Central Hub with a Switch

Adding Switches to a Backbone Switched Network

Designing for Maximum Benefit

Good Candidates for Performance Boosts from Switching

Important to know network demand per node
Try to group users with the nodes they communicate with most often on the same segment
Look for departmental traffic patterns
Avoid switch bottlenecks with fast uplinks
Move users switch between segments in an iterative process until all nodes seeing less than 35% utilization

Client/Server Traffic

Distributed Traffic

Advanced Switching Technology Issues

Managed or Unmanaged

Store-and-Forward vs. Cut-Through

Blocking vs. Non-Blocking Switches

Switch Buffer Limitations

Layer 3 Switching

Mikrotik Hotspot Quick Setup Guide + Tips n Tricks for Hotspot

noreply@blogger.com (Anonymous) — Tue, 14 Jan 2014 18:33:00 +0000

A HOTSPOT is way to provide internet access to subscribers by means of an easy to use login interface as it does not require any client software/driver/dialer at user end. To log in, users may use almost any web browser , so they are not required to install additional software.It is also possible to allow users to access some web pages without authentication using Walled Garden feature.
In my personnel opinion, Hotspot is best suited for ad hoc situations, where you cannot control how the client has their machines configured. This is generally useful in Conference Rooms, Hotels, Cafe’s , Restaurants and likewise since people will come and go and you have few permanent users.
One big advantage of using hotspot is that HotSpot does not require any client software/driver/dialer. One disadvantage of using HotSpot is that its usually requires your client to open up his browser to log in before he can use your service . So users wanting to connect to your service using a router or some kind usually have a problem (as routers usually don’t support logging in via HTTP).
Following is a quick setup guide (CLI version) on how-to setup HOTSPOT server in Mikrotik using command interface.
This guide will help you in setting up . . .
# HOTSPOT server,
# It will also configure DHCP to assign users IP Address from 172.16.0.1-172.16.0.255 ip pool .
Change it accordingly.
# I will add two Speed / Rate Limit Profiles, 256k and 512k, it will add a new user ‘zaib‘ password=test with512k profile and user ‘test‘ Password=test with 256k Limit.
# It will Add Default Route to internet which is DSL router ip 192.168.2.2 ,
Change it accordingly.
In this examples, Mikrotik have two interface cards.
Ether1 LAN = 172.16.0.1 / Connected with LAN/Hotspot users
Ether2 WAN = 192.168.2.1 / Connected with DSL router
DSL Router = 192.168.2.2
Script Starts Below.

/ip address

add address=172.16.0.1/24 comment=LAN disabled=no interface=ether1 network=172.16.0.0

add address=192.168.2.1/24 comment=WAN disabled=no interface=ether2 network=192.168.2.0

/ip pool

add name=hs-pool-1 ranges=172.16.0.10-172.16.0.255

/ip dns

set allow-remote-requests=yes cache-max-ttl=1w cache-size=10000KiB max-udp-packet-size=512 servers=192.168.2.2

/ip dhcp-server

add address-pool=hs-pool-1 authoritative=after-2sec-delay bootp-support=static disabled=no interface=ether1 lease-time=1h name=dhcp1

/ip dhcp-server config set store-leases-disk=5m

/ip dhcp-server network add address=172.16.0.0/24 comment="hotspot network" gateway=172.16.0.1

/ip hotspot profile

set default dns-name="" hotspot-address=0.0.0.0 html-directory=hotspot http-cookie-lifetime=3d http-proxy=0.0.0.0:0 login-by=cookie,http-chap name=default rate-limit="" smtp-server=0.0.0.0 split-user-domain=no use-radius=no

add dns-name=login.freepcsupport.net hotspot-address=172.16.0.1 html-directory=hotspot http-cookie-lifetime=1d http-proxy=0.0.0.0:0 login-by=cookie,http-chap name=hsprof1 rate-limit="" smtp-server=0.0.0.0 split-user-domain=no use-radius=no

/ip hotspot

add address-pool=hs-pool-1 addresses-per-mac=2 disabled=no idle-timeout=5m interface=ether1 keepalive-timeout=none name=hotspot1 profile=hsprof1

/ip hotspot user profile

set default idle-timeout=none keepalive-timeout=2m name=default shared-users=1 status-autorefresh=1m transparent-proxy=no

add address-pool=hs-pool-1 advertise=no idle-timeout=none keepalive-timeout=2m name="512k Limit" open-status-page=always rate-limit=512k/512k shared-users=1 status-autorefresh=1m transparent-proxy=yes

add address-pool=hs-pool-1 advertise=no idle-timeout=none keepalive-timeout=2m name="256k Limit" open-status-page=always rate-limit=256k/256k shared-users=1 status-autorefresh=1m transparent-proxy=yes

/ip hotspot service-port set ftp disabled=yes ports=21

/ip hotspot walled-garden ip add action=accept disabled=no dst-address=172.16.0.1

/ip hotspot set numbers=hotspot1 address-pool=none

/ip firewall nat add action=masquerade chain=srcnat disabled=no

/ip hotspot user

add disabled=no name=admin password=123 profile=default

add disabled=no name=zaib password=test profile="512k Limit" server=hotspot1

add disabled=no name=test-256k password=test profile="256k Limit" server=hotspot1

/ip route

add disabled=no distance=1 dst-address=0.0.0.0/0 gateway=192.168.2.2 scope=30 target-scope=10

Basic HOSTPOT is now configured. Now goto client pc, Upon booting, it will automatically receive ip from hotspot dhcp server, Open your browser and try to open any web site, You will see Hotspot Login page asking for credentials.

OR you can customize the hotspot login page to show your logo look like something

You can also make configuration changes via GUI.
Please read the following guide for easy n step by step guide on HOTSPOT setup.
http://wiki.mikrotik.com/wiki/Hotspot_server_setup

HOWTO CUSTOMIZE HOTSPOT LOGIN PAGE

You can use some fancy good looking login page. To customize the login page, Open Winbox , Goto Files , here you will see various files, look at hotspot/login.html , Drag n Drop this file to Desktop. See the attached picture.

Now open it using any html editor, I always prefer FRONTPAGE for editing HTML pages due to its easy interface. Customize it according to your need, You must have some prior knowledge of some website / html editing. You can insert your logo , advertisement and lot more in this page. After you are done, simply Upload the file back from where you downloaded it. use drag n drop feature. For beginners, I recommend you not to change any default variable, just ad your logo n text , After you are familiarized with the structure, you can build your own fully customized login page.
Good examples of hotspot login page can be found at following link.

http://forum.mikrotik.com/viewtopic.php?t=26609

Howto Redirect User to your selected site after succesful Login

If you want that after successful login to hotspot , user must be redirected to your advertisement web site / any other web, then You will need to replace a variable on the hotspot/login.html document on the mikrotik router.
You must replace $(link-orig) with the url of the website you want them to get after login.
There are two links that you have to replace, and both look like this:

1	`<input type="hidden" name="dst" value="$(link-orig)">`

Change them to

1	`<input type="hidden" name="dst" value="http://pcsupport2013.wordpress.com">`

Now after successful login, user will automatically redirected to yoursite.com, you can also create your customized page showing users details using the variables available.

Howto Allow URL for some destinations for non authenticated Users

Sometimes it is required to allow access to some destinations / URLs for non authenticated users, for example if you have a web / radius server and you want that user can access it without login to hotspot, then you can add its ip address in walled garden.

/ip hotspot walled-garden add dst-host=www.website.com

/ip hotspot walled-garden ip add dst-address=192.168.2.2 action=accept

OR

/ip firewall nat add chain=pre-hotspot dst-address=192.168.2.2 action=accept

HOTSPOT users can’t communicate with each other on LAN or PROXY-ARP issue

If you face hotspot broadcast issue / arp-poisoning , problem, Remove the

address pool from the Hotspot to turn off Universal NAT,

/ip hotspot set <number> address-pool=none

OR

/ip hotspot set numbers=hotspot1 address-pool=none

OR

/ip firewall nat add chain=pre-hotspot dst-address-type=!local hotspot=auth action=accept

Howto Bypass authentication for Few Clients

This bypasses the hotspot by mac address.

1	`/ip hotspot ip-binding add mac-address=xx:xx:xx:xx:xx:xx type=bypassed`

(change xx:xx:xx:xx:xx:xx with your user’s mac address. You can also use the ip address to bypass.

Download Top 5 Wireless HotSpot Software for Windows

noreply@blogger.com (Anonymous) — Tue, 14 Jan 2014 18:26:00 +0000

These days, everyone having two or more internet-connected devices (e.g.,PC, laptop and your phone), but it is not possible to take as much as Connections for all devices. Luckily, you can rectify this injustice by using your laptop as WI-FI hotspot.
By using readily available technology anybody can create a Hotspot and offer access to all wireless enable devices, customers and neighbors within range of their wireless network.
Here we have some popular methods which make your laptop as WI-FI hotspot.

1.Connectify

Connectify hotspot is an easy to use software router for Windows computers that utilizes your PC’s built in Wi-Fi card to wirelessly share any available Internet connection including Local Area Connection or 3G/4G Data cards with friends, co-workers, and mobile devices. You can down load this fromhttp://www.connectify.me/and install in your PC fallow the below mentioned easy steps to make your laptop as WI-FI hotspot.
Set your desired Hotspot name and password; Select which Internet connection you’d like to share.Click Start Hotspot, thats it!

Connectify is one of the easiest methods to use your laptop as a Wi-Fi hotspot. However, since it is not working on some of system, we recommend that you try Virtual Router (http://virtualrouter.codeplex.com).

Download Connectify

2.Virtual Router

Virtual Router unlike Connectify, this one is completly free but only works with Windows 7 or Windows Server 2008 R2 at the moment (Connectify Pro works with Windows XP and Vista too). Using Virtual Router, users can wirelessly share any internet connection (Wifi, LAN, Cable Modem, Dial-up, Cellular, etc.) with any Wireless device. You can give your wireless network a name of choice and are required to set a securitypassword with a minimum of 8 characters for the network. Please note that Virtual Router is currently in beta and it is mandatory to set a password for the connection.

Download Virtual Router

3. mHotspot

Turn your windows laptop into wifi hotspot mHotspot is a completely free software which converts your windows 7 laptop into a virtual wifi router and creates a secure wifi hotspot.(no installation required)You can share single internet connection(LAN, Ethernet, Data-Card, 3G/4G, Wif) for multiple devices like laptops, smartphones, android phones, PDAs, Ipads etc.
Play Multiplayer gaming using mHotspot
No router or external hardware is required apart from your existing one.

Customize with themes

Features :

No Installation required
Application size is 400KB only
Fully customizable Hotspot Name
Share any type of Internet Connection(LAN, Ethernet,3G/4G,Wifi etc)
Android phones, ipads, PDAs, tablet-pcs and other devices can access
See the details of the connected device(Name, Ip Address, Mac Address)
See the network usage(Upload and Download Speed, Transfer Rates)
Secures your wireless hotspot with WPA2 PSK password security
Set max. number of devices that can be connected
Extends your Wifi range(Acts as a repeater)
In-app internet selection
Works with Windows 7(Testing in 8)

Download mHotspot Software

4. Bzeek

Bzeek is a free to use desktop client for Windows XP, Vista, and 7 users. The app utilizes your Internet connection in such a way that it transforms your laptop into a Wi-Fi hotspot. You can do this on your desktop computer too, provided you have a supported Wi-Fi card installed. The Wi-Fi hotspot is free to use and it uses your unused bandwidth.
This hotspot is available to all smart-device owners nearby who can connect to the Internet using your unused bandwidth. You can get paid for the bandwidth of yours that is used through the application and to stop the sharing you can exit the app anytime.

Features

A user-friendly desktop app.
Compatible with Windows computers.
Makes your laptop into a Wi-Fi hotspot.
Enables connection sharing and spreads free Internet.

Check out Bzeek @ http://www.bzeek.com/static/index.html

Download Bzeek Hotspot Software

5. Zonerider
Zonerider creates the hotspot and it will give the options to user access either free or purchase options.
Once you have setup your Zonerider Hotspot. You can also offer free access to devices belonging to Staff, Friends, Family of non-screen based devices. like servers, printers, cameras and so on. Simply hi-light the user session in the software and click “Add local Free Access) that device will never see the login page as if there is no Hotspot running.
Zonerider Hotspot is ideal for community broadband, hotels, conference & exhibition centres, hostels, serviced apartments, health clubs, B& B’s, campsites, cafes or in fact any hospitality or public venue.

Features:

New Windows Software Instantly Turns your Wireless network into a Hotspot
High revenue share – no monthly charges
Allow free no-hotspot access to family friends or staff
Absolute security – Zero technical knowledge required
Full billing and payment management
Customise your Hotspot login page
Set your own price and currency
Comprehensive back up support

Download Zonerider

How to use UBNT airlink? Calculate P2P wireless distance easily

noreply@blogger.com (Anonymous) — Tue, 26 Nov 2013 18:40:00 +0000

Today I am going to show you a better way to calculate the distance using ubiquiti airlink online support. This tool is special for those guys who are using ubnt devices for their ptp and ptmp links. Follow the steps below and you will get atleat 90% positive calculations.

1. First open this website http://www.ubnt.com/airlink. If it prompts to install the google pluggin then install it. For reference check the image below. When you install the google earth pluggin, restart your browser

2. After restarting the browser reopen the airlink website shown above. You will see the google earth aerial view, like you can see on the image below.

3. Beside the airlink website, open another website http://www.itouchmap.com/latlong.html Now enter the closest location or biggest city name near your basestation or the location of your main tower where you want to set the access point. See the image below for reference.

4. Now move the red marker to the exact location of you basestation or access point.

5. After the setting of your red marker, scroll down and copy the latitude and longitude of the marker location as seen on the image below.

6. After getting the latitude and longitude from the website, select your device, tower height and frequency band you want to use e.g. 2.4Ghz or 5.8Ghz. Paste the latitude and longitude on the airlink location properties of your access point and press CENTRE MAP ON THIS STATION BUTTON! Then click CONFIGURE NEXT STATION to set the properties of your station device See the images below for reference

7. Do the same procedure for the next station device and click VIEW CALCULATIONS. see the image below for reference

Here you go! you can see the exact signal strength, height, any obstacles and Fresnel zone of your ptp link. I always use this technique before going to buy the appropriate devices and get 90% results and performance after installation of the devices using this airlink help. I hope you like this article and sorry if you did not understand anything or I missed something in this.

YUMI – Multiboot USB Creator

noreply@blogger.com (Anonymous) — Thu, 21 Nov 2013 12:21:00 +0000

YUMI (Your Universal Multiboot Installer), is the successor to our MultibootISOs. It can be used to create a MultibootUSB Flash Drivecontaining multiple operating systems, antivirus utilities, disc cloning, diagnostic tools, and more. Contrary to MultiBootISOs which used grub to boot ISO files directly from USB, YUMI uses syslinux to boot extracted distributions stored on the USB device, and reverts to using grub to Boot Multiple ISO files from USB, if necessary.

Aside from a few distributions, all files are stored within the Multiboot or yumi folder (depending on version), making for a nicely organized Multiboot USB Drive that can still be used for other storage purposes.

Creating a YUMI Multiboot MultiSystem Bootable USB Flash Drive
YUMI works much like Universal USB Installer, except it can be used to install more than one distribution to run from your USB. Distributions can also be uninstalled using the same tool!

YUMI's Main Multiboot Boot Menu

YUMI-1.9.9.6.exe – November 20, 2013 – Changelog
YUMI V2 BETA for Windows -> Add Disinfec't 2013 (German Antivirus). Fix broken old Parted Magic menu entry.

YUMI-1.9.9.6.exe for WindowsSource Code

YUMI for Windows MD5: 488F9947F4A2E32249B20221046E3322

NOTE: YUMI V2 can't remove distributions previously installed with Legacy YUMI! Although no longer supported, you can still Download Legacy YUMI

Linux Based Legacy YUMI Downloads:

YUMI for Ubuntu Linux
Source Code
YUMI for Debian Linux

How to Download a Flash Game

noreply@blogger.com (Anonymous) — Thu, 21 Nov 2013 12:09:00 +0000

Method 1 of 5: From any web browser

1
Find the web page you want to download the game from.
2
Copy the site's URL
3
Go to file2hd.com and paste the copied url next to where it says "URL:".
4
Press Ctrl + F and type in ".swf" and press enter.
5
There should be two links that show up. Most of the time, both of the links are the same.
6
Right click on one of the links and select "save link as" and direct where you want to save it.

EditMethod 2 of 5: Internet Explorer

1
Load the web page you want to download the game from. Go to the website and locate the web page with the game. Wait for the game to load.
2
Right-click anywhere outside the flash game in the Internet Explorer window and select "View Source" from the drop down list.
3
Search. Click on the Notepad window that comes up and hit "Ctrl+f" and type in ".swf". It should be the first or second .swf.
4
Copy URL. Copy the URL listed to Internet Explorer if it is only part of a URL then paste it right after the main URL i.e. www.addictinggames.com.
5
Save. Hit "Ctrl+s"and select were you want to save it.

EditMethod 3 of 5: Safari

1
Load the web page you want to download the game from. Go to the website and locate the web page with the game. Wait for the game to load.
2
Right-click anywhere outside the flash game in the Safari window and select "View Source" from the drop down list.
3
Search. Click on the window that comes up and hit "Ctrl+f" and type in ".swf". It should be the first or second .swf.
4
Copy URL. Copy the URL listed to Safari if it is only part of a URL then paste it right after the main URL i.e. www.addictinggames.com.
5
Save. Hit "Ctrl+s" and select were you want to save it.

EditMethod 4 of 5: Google Chrome

1
Load the web page you want to download the game from. Go to the website and locate the web page with the game. Wait for the game to load.
2
Hit "Ctrl+Shift+c".
3
Search. Click on the window that comes up and hit "Ctrl+f" and type in ".swf". It should be the first or second .swf.
4
Copy URL. Copy the URL listed to Google Chrome if it is only part of a URL then paste it right after the main URL i.e. www.addictinggames.com.
5
Save. Hit "Ctrl+s"and select were you want to save it.

EditMethod 5 of 5: Firefox

1
Load the web page you want to download the game from. Go to the website and locate the web page with the game. Wait for the game to load.
2
Right-click anywhere outside the flash game in the Firefox window and select "View Source" from the drop down list.
3
Search. Click on the window that comes up and hit "Ctrl+f" and type in ".swf". It should be the first or second .swf.
4
Copy URL. Copy the URL listed to Firefox if it is only part of a URL then paste it right after the main URL i.e. www.addictinggames.com.
5
Save. Hit "Ctrl+s"and select were you want to save it.

Firefox and a Download manager

1
Load the web page you want to download the game from. Go to the website and locate the web page with the game. Wait for the game to load.
2
Right-click anywhere outside the flash game in the Firefox window and select "View Page Info" from the drop down list.
3
Go to the "Media" tab and sort the contents by type.
4
Search for SWF file type and the name of your game.
5
Right click and copy, then paste it into a download manager.

EditTips

Take all generic internet safety measures. Make sure you have an anti virus up-to date and running. Download games only from trusted websites.
If you want to play the game, open it with a web browser. Google Chrome and Firefox normally work best.

Windows Radius Server (TekRadius)

noreply@blogger.com (Anonymous) — Thu, 21 Nov 2013 11:50:00 +0000

TekRadius is a Windows radius server built on the .net platform. It natively supports IETF/Cisco/Mikrotik which is nifty. I know the first thing that pops into mind is why wouldn’t you just use the Windows radius server (IAS). To this I say because IAS requires you to create windows users to authenticate with the server. What I’m using this for is to integrate radius into standalone management systems.

If you have a hotel system, library system or other, you can use TekRadius to easily integrate those users into your Hotspot authentication system.

I say easily because they have a nice little GUI that you can manually enter information into, but they also have an easy to use CLI interface.

All we need is a little scripting to take the existing management system’s users and convert them over to TekRadius.

The only thing that seems like it should be there is the ability to pull a user list from the CLI. You have to look via the GUI to get a complete list of users. If you wanted to do some programmatic magic, you could work around this by just keeping a list of the users or perhaps hitting the SQlite DB directly.

If anyone has some specific needs for some conversion scripting, let me know, as I would be happy to integrate a solution for you

How to Block Torrent in Mikrotik

noreply@blogger.com (Anonymous) — Thu, 21 Nov 2013 11:46:00 +0000

The bane of most ISPs is Peer to Peer traffic(p2p). If you run hotels or apartments, especially apartments full of students, p2p will be your main source of issues. In some cases, extreme measure must be taken. So how does one go about taking back their network? The first thing to do is to find the offending traffic.

Mikrotik has some built in matching functionality for p2p traffic. You can use this in mangle rules or firewall rules. In mangle, you can mark the packets and then lower their precedence, or stick them in a smaller queue. In the firewall, you can block them all together.

Notice the many matches

Here’s the rub, bit torrent traffic is almost universally encrypted, so these matching methods will generally not do you too much good. These matches must inspect the packets, and when encrypted they look like so much junk. So what do you do now?

You drop it like you are Fox and bit torrent is “Are you smarter than a fifth grader?”, “Do not disturb”, “Don’t forget the lyrics”, “Hole in the wall”, “MADtv”, “osborns reloaded”, “Prison Break”, “Secret millionaire”, “Sit down, shutup” or “Terminator”. So how do we drop it? I do it in the following ways.

First, we block people from finding torrents Using MTKs layer 7 inspection(L7), we match http get requests for bit torrent sites and related sites. Here’s my regex:

^.*(get|GET).+(torrent|thepiratebay|isohunt|entertane|demonoid|btjunkie|mininova|flixflux|torrentz|vertor|h33t|btscene|bitunity|bittoxic|thunderbytes|entertane|zoozle|vcdq|bitnova|bitsoup|meganova|fulldls|btbot|flixflux|seedpeer|fenopy|gpirate|commonbits).*$

Here’s the CLI code you can simply paste:

1
2

/ip firewall layer7-protocol
add comment="" name=torrent-wwws regexp="^.*(get|GET).+(torrent|thepiratebay|isohunt|entertane|demonoid|btjunkie|mininova|flixflux|torrentz|vertor|h33t|btscene|bitunity|bittoxic|thunderbytes|entertane|zoozle|vcdq|bitnova|bitsoup|meganova|fulldls|btbot|flixflux|seedpeer|fenopy|gpirate|commonbits).*$"

This regex matches most of the popular torrent sites. You will notice that the word torrent is also there. If you go to google and type torrent, it will match the get request…what! hehehe. This means that even if they try to google for a torrent it will get matched. So now we put in a firewall rule to block with this L7.

1
2
3

/ip firewall filter
add action=drop chain=forward comment="block torrent wwws" disabled=no layer7-protocol=\
    torrent-wwws

From the GUI, you set chain to forward and under the advanced you choose the L7:

As you can see, on the forward chain, I added the L7 torrent-wwws, which was defined earlier. This means anyone trying to browse to any of our specified bit torrent sites will get blocked. Also if their client tries to hit the tracker with a get request, it gets stopped too. Now, just to put a bow on top, lets be a little more devious! Lets block DNS queries based on the same regex.

Here’s the new regex:

^.+(torrent|thepiratebay|isohunt|entertane|demonoid|btjunkie|mininova|flixflux|torrentz|vertor|h33t|btscene|bitunity|bittoxic|thunderbytes|entertane|zoozle|vcdq|bitnova|bitsoup|meganova|fulldls|btbot|flixflux|seedpeer|fenopy|gpirate|commonbits).*$

Here’s the code to copy and paste in the CLI:

1
2

/ip firewall layer7-protocol
add comment="" name=torrent-dns regexp="^.+(torrent|thepiratebay|isohunt|entertane|demonoid|btjunkie|mininova|flixflux|torrentz|vertor|h33t|btscene|bitunity|bittoxic|thunderbytes|entertane|zoozle|vcdq|bitnova|bitsoup|meganova|fulldls|btbot|flixflux|seedpeer|fenopy|gpirate|commonbits).*\$"

Here’s the firewall rule to block:

1
2
3

/ip firewall filter
add action=drop chain=forward comment="block torrent dns" disabled=no dst-port=53 \
    layer7-protocol=torrent-dns protocol=udp

Notice that I’m blocking UDP to port 53, so this will drop all DNS queries to our torrent list above. This way, if they are using a web proxy, they will still get blocked! If their client tries to do any resolution matching this good stuff, it will get blocked too.

Using the above method to block along with the standard p2p matching, it looks like you can save around 25% – 50% utilization on traffic. Though, what will the kids do when they can’t download their pornography and movies…I think the internet has no other use?

*Edit* It appears as if Blizzard, makers of WoW, are now only allowing updates via BitTorrent. I’ve written a little exclusion for this that can be found here.

VLC Media Player 2.1.0 Rincewind: New features & review

noreply@blogger.com (Anonymous) — Sun, 17 Nov 2013 21:38:00 +0000

VLC Media Player, the best media player for Windows, has become even better with its 2.1 release named “Rincewind”. Bugs have been fixed, quality has been improved, and for sure new features have been added. Bugs have been fixed in large amounts and now VLC supports many new inputs and devices. VLC 2.1.0 is the first release to be officially get ported to iOS and Android, and partially to Windows Store App and Windows RT.

VLC Media Player

Rincewind has a rewritten audio core which allows better volume outputs and better device management. In order to support the new core, some of the modules have also been rewritten. Rincewind also correctly support multi-channel layouts in all formats: 5.1, 6.1 and 7.1. All new audio outputs have been added to give its user a good and smooth audio experience.

If we see video improvements, most of them are done for Mobile Versions, as color conversion shaders are now supported on Android and iOS, and a new filter for side-by-side 3D has been successfully introduced. Moreover Open GL output has been ported to OpenGL ES and as a result of which VLC has introduced new video outputs for iOS using OpenGL ES2.

Hardware encoding for various platforms has been added and VLC now supports Microsoft Smooth Streaming. Now VLC shows support for fragmented MP4, Wave/RF64 files and for FLAC, Atrac, ADPCM, DV Type 1, 12bits DV audio in AVI files.

Some of the extended features are

Better support for AVI and MKV files
Audio fingerprinting using AcoustID
Developments on Blu-Ray, Dash and HTTP inputs
Better windowless integration for HTML
Many more features…

There are many other features included, out of which some are very useful for developers and rest for all the VLC lovers. This release has added something essential to the software and it has been made better. Rincewind update is considered to be as one of the important VLC updates since it includes a lot major and minor improvements.

We’ve seen many bugs fixed and many new features added. The best ever media player has become even better. You will find the updates very useful, as all the codec upgrades can play maximum file formats smoothly.

Click here to download VLC Media Player.

Best VLC Skins for Windows : Free download

noreply@blogger.com (Anonymous) — Sun, 17 Nov 2013 21:30:00 +0000

VLC Media Player has been one of the most popular media players for Windows, but when it comes to interface and UI,VLC has a very simple, clean and an elegant UI with very basic and simple controls. Some of us may not like it or may simply want to change it to something newer and different. Fortunately, there are many VLC skins available as freedownload. Let us check out some of the best VLC skins today.

Best VLC Skins

MinimalX

MinimalX is a clean and an elegant skin for VLC Media Player. It comes with a nicely designed interface that gives out a premium look and a bit of colorful graphics. It has access for all the VLC operations and is very easy to operate. Overall it is a great skin with minimalistic interface. Click here to download MinimalX.

Orion

Orion is another featured filled skin for VLC Media Player. It comes with features like playlist and also comes with and equalizer. It comes in two variants, in the first one we have the ‘close blue buttons’ aligned at the right side and in the other at left side. You can install the desired one. Click here to download Orion.

Transformers

For all the Transformers lovers, here we have the rock solid transformers UI for VLC. It is a well-built and has a nicely designed UI, that is unique in its kind. It also has the best graphics. The buttons are nicely embedded and gives you a rock solid feel. Click here to download Transformers Skin.

Zune VLC Skin

It is a nice VLC skin that resembles the Zune software. It comes with an elegant and nice interface just like Zune. It is definitely for Zune lovers. It adds simplicity and beauty to VLC media player. Overall a nice and good work of developer. Click here to download Zune VLC Skin.

Nintendo Style

This VLC skin resembles the Nintendo gaming gear. It has buttons that almost resembles Nintendo hardware and it has got a good UI and definitely it is different from others due to its unique Nintendo design. Click here to download Nintendo Style.

Slim Bean

Slim Bean skin is somewhat similar to the MinimalX as far as the UI is concerned, but there are some differences that have made me put Slim Bean in this list. It is again a minimalistic design which also resembles Windows Metro UI. Click here to download Slim Bean.

Alienware Darkstar

Gaming lovers, this one’s for you. Alienware skin is another graphical skin which has a lot importance for Alienware lovers. It has a nice embedded Alienware Logo and comes with a good graphical UI. Click here to download Alienware Darkstar.

If you need to know how to install these skins, you will get the answers here. Moreover, you can even find many more VLC skins on the same page.

Multi-Tabs Functionality to your Windows File Explorer

noreply@blogger.com (Anonymous) — Sun, 17 Nov 2013 21:27:00 +0000

While using internet browsers you open multiple tabs. Have have you ever wondered if you could use Windows the same way? I’m referring to the easy-to access windows, nicely arranged into tabs, so that you don’t have to juggle between Windows all the time. Well, here’s what you can do. An extension for the File Explorer called Clover is your answer for adding the functionality of multi-tabs in Windows File Explorer.

Add tabs to Windows File Explorer

As soon as you install and run Clover, you will find no difference between Clover and your internet browser. Clover has the same multi-tab functionality to access your Windows files and folders. One a single Clover Window, you can access multiple folders and you can also add your regular accessed folders as bookmarks.

Clover: Important features

Easy access to folders, highly efficient

Clover makes it absolutely convenient to open a new file or folder, saving both time and effort to a great extent. Simply press Ctrl + T to open a new page (or tab), Ctrl + W is for closing the page and to toggle between the pages, use Ctrl + Tab.

Smooth functioning with OS

The app is built and incorporated in such a way that a Chrome user can effortlessly get used to the multi-tab functionality for Windows, without having to adapt to a new file management system.

Super-fast bookmarks bar

Saving a folder in the bookmarks can be done within a flick of a second. You can either press Ctrl + D to save the folder path you are currently using or just drag it toward the bookmarks bar for an instant save. It’s right there whenever you want to access it, there is absolutely no need to search for it all over your computer.

Latest features:

The latest version of Clover comes with a lot of new updates & features, such as reopening of last opened folders,restoring last-opened folders in case Clover crashes and you can also import or export bookmarks. You can even apply themes to Clover by downloading Chrome themes, which will be supported by Clover.

Clover free download

Download Clover here.

This post on Windows explorer replacements and alternatives is sure to interest you!

Ultimate Windows Tweaker, a Tweak UI for Windows 7 & Vista

noreply@blogger.com (Anonymous) — Sun, 17 Nov 2013 21:25:00 +0000

We are pleased to release our Ultimate Windows Tweaker for Windows 7 and Windows Vista. Ultimate Windows Tweaker is a freeware TweakUI Utility for tweaking and optimizing Windows 7 & Windows Vista, 32-bit & 64-bit. This Tweaker was first released at the Microsoft South Asia MVP Meet 2008. It can simply be downloaded and used as a portable application to customize your Windows to meet your requirements. With judicious tweaking, it can make your system faster, more stable, and more secure with just a few mouse clicks. The tweaker detects whether you have Windows 7 or Windows Vista installed and accordingly offers you the relevant tweaks only.

UPDATE: 25th Jan 2011. Ultimate Windows Tweaker has been updated to v 2.2. It now works on Internet Explorer 9 and includes additional tweaks too, as mentioned in its Change log.

UPDATE: 17th Aug, 2012. Ultimate Windows Tweaker v 2.2 was installed by me on Windows 8 Pro x64 RTM, and it worked fine. All tweaks, except the one’s for Internet Explorer, appear to work.

Change Log and additional tweaks included in UWT v 2.2:

Internet Explorer

Supports Internet Explorer 9
Enable Menu bar permanently
Always on InPrivate Filtering
Hide Compatibility View button
Disable sending keystrokes to your default search engine
Enable Quick Tabs
Manage no. of rows in about:Tabs (IE9 only)
Disable caching of SSL pages
Enable software rendering instead of GPU rendering (IE9 only)

User Accounts & UAC

Manage user accounts (improved)

System Performance

Disable PAE

Other

Extensive code optimization for speed improvement
Improved refreshing capability after applying tweaks
No more prompts after each Apply clicks
Some UI and typo fixes.

The tweaker is a 345KB .exe file which does not require an install, but yet packs over 150 tweaks & settings. Simply download the zip file, extract its contents and run Ultimate Windows Tweaker.

Please don’t detach Empty Icon from executable’s root, the Empty Icon is copied tosystem directory and referred in runtime. The tweaker has been designed by my MVP colleague Ramesh Kumar for The Windows Club.

Whats new in UWT?

- Revamped UI similar to Windows 7/Vista UI controls

- Improved: Optimize services, enable/disable services and start/stop as well instantly

- Added on System Information page
+ Version with build no
+ System Rating
+ Computer description

- Added on Personalization page
+ Disable Aero shake
+ Disable Aero Snap
+ Enable Jump lits and nos of jump list items
+ Sorted Startmenu with all Windows 7 items
+ Bing Search replaced Live Search in Custom Start Search
+ Use large icons on Taskbar
+ Disable Aero Peek preview
+ Group when Taskbar full is added

- Added in User Accounts & UAC
+ Welcome screen text and buttons’ effects
+ Set custom background on Welcome screen (OEM Background)

- Added in System Performance page
+ Trackbars’ Tooltip shows actual value in miliseconds
+ Improved “Menu action”
+ Improved “Enable support for 4GB of RAM on 32bit Windows”
+ Disable Windows Security Center service

- Added in Security Settings
+ Disable System Restore settings
+ Disable Change Color and Appearance
+ Disable to skip starting programs by pressing Shift key

- Added on Internet Explorer page
+ Reset IE to factory default button added

- Additional Tweaks
+ Disable Windows Startup sound
+ Disable pagefile (Virtual Memory)
+ Enable Large System cache
+ Delete pagefile during shutdown process

- Minor bugs fixed

It is always recommended to create a system restore point before tweaking your system, and hence an easily accessible button for creating the same has been provided in the tweaker. Should you wish or need to, you can always restore your system to the Windows default settings using the Restore Defaults button and applying them.

Details of earlier version/s can be found here.

Check out Ultimate Windows Customizer, which allows you to customize your Windows installation, including changing the Start Button, Logon Screen, Thumbnails, Taskbar, Explorer look, Windows Media Player and more! etc.

How To Make Fake Calls - Prank Your Friends

noreply@blogger.com (Anonymous) — Sun, 17 Nov 2013 21:11:00 +0000

Caller ID Spoofing is used to faking your identity while making a phone call. This is the best way to prank your friends by making call from their own number or you can display any number on victim's phone. From last couple of days I was searching for Caller ID Spoofing software for my smartphone, but none of them didnt worked. But When I tried for PC I found some websiteswhich really helps to display fake number on recipient Caller ID.

Also Check : Download and Play Chess Titans in Windows 8/Xp

How to Make Prank Calls?

First Open Crazycall.net on your browser
Select Your Country, Then Enter Caller ID that you want display on Victim's Phone
Then Enter Victim's Phone Number, Also you change your voice pitch (Low, Normal, High)
Click on GET ME A CODE.
It will Generate number and code, Dial given number from your phone.
After Calling on that number, It will ask for Code. Enter given Code
That's it.. Your call will be directed to Victim.

Some other websites to make fake calls (Caller ID Spoofing)

Spoofcard.com
Spooftel.com
Bluffmycall.com
Calleridfaker.com

Final Words

The fake call will be charged as per International rates, And Use this websites for education purpose only, Don't use it for any Crime or Illegal works.

HOW TO BLOCK A WEBSITE IN YOUR PC

noreply@blogger.com (Anonymous) — Thu, 14 Nov 2013 22:38:00 +0000

share a very cool trick. By using this trick you can block a site on your PC. Suppose you want to blocked facebook so that no one access facebook in your laptop without your permission. This is a very simple trick just follow some steps and enjoy it….

Step 1 :- First open your C:\ drive then go to..

C:\WINDOWS\system32\drivers\etc

Step 2 :- open hosts file in notepad and modify little bit, then save it.

74.125.235.20 www.facebook.com

Here 74.125.235.20 is a IP address of goolge.com, so what I can do I am simply using the IP address of google so that if any user open www.facebook.com then it will redirect to the google page. In this way the unauthorized user not be able to open their facbook in your system, anf if in place of google IP Address you are using 127.0.0.1 IP address i.e is IP default IP address of your system then it will display cannot find server.

Now see I am open my facebook but it redirect to the google.

In this way you can block any website.

HOW TO INSTALL BACKTRACK ON PC .

noreply@blogger.com (Anonymous) — Thu, 14 Nov 2013 22:36:00 +0000

HOW TO INSTALL BACKTRACK ON PC .

Hi friends recently
I have shared a tutorial how to create a Bootable Pendrive for Backtrack. And Now today I am going to share a tutorial how to install backtrack on PC. As I said that backtrack is one of the powerful collection of tools for hacking. By using these tools you can easily do lot of hacking. Friends don’t worry I will provide all the types hacking tutorial using backtrack on thehttp://yashankhacking.blogspot.in. Now I will going to show you how to install backtrack step by step and remember my friends any query you have regarding Backtrack please leave their comments….

Step 1 :- Friends first you make a bootable pendrive from the previous tutorial.

Step 2 :- Now restart the computer, and select USB boot menu as a primary installation device. Then again restart your PC again.

Step 3 :- Then select Default boot text mode, and hit enter.

Step 4 :- the default user id and password of backtrack is

User id – root

Password – toor

Now after that it will appear like this and you can write the following code Startx and hit enter.

Step 6 :- Now Double Click on Install Backtrack Icon.

Step 5 :- After that your installation process is started, then choose your language

HOW TO BREAK ADMINISTRATOR PASSWORD WITHOUT ANY SOFTWARE

noreply@blogger.com (Anonymous) — Thu, 14 Nov 2013 22:34:00 +0000

hello guys this trick is going to solve the problem of many users. It is common for many user they usually forget their Administrator password and they can’t able to open their windows. But this will help you overcome the problem of all such type of user who forget their password. As we know that there is many software is available to break the Administrator password but who care about that, because you know about this trick to break any password without any software. Now I am going to show you how you can do it.

This is welcome screen of windows7 which is password protected now I am going to show you how to break the Administrator password.

Now what you can do, first you can restart your windows.

Step 1:- First you restart your windows and then insert your Bootable window disk into CD Rom or you can also use Bootable USB. Then Choose a Repair Your computer option.

Step 2 :- Then select the Command Prompt Option.

Step 3 :- Then Write the following code into cmd.

Copy C:\windows\system32\sethc.exe C:\

Copy C:\ windows\system32\cmd.exe C:\windows\system32\sethc.exe

Then exit the cmd and restart the winodws.

Here these command is used for to replace the cmd.exe file with sethc.exe

Step 4:- After restart the windows, you can remove your bootable disk immediately from your system. Then again open the welcome screen, which is still password protected.

Now on the welcome screen you only press the Shift key 5 times. After that cmd is again open with sticky key warning message you just click yes on sticky key message.

Step 5 :- Now we can write the following code in the cmd and then exit it.

Net user Yashank Hacking

Here Yashank is a Administrator name and Hacking is a new password.

Now put the new password and check that your windows is open or not

How To Speed Up YouTube and Many Other Sites

noreply@blogger.com (Anonymous) — Wed, 13 Nov 2013 20:12:00 +0000

Increase Buffering speed of YouTube and Hundreds of Other Sites

Advantages

1.Avoid wasting time on Buffering.

2.Speed up videos while using VPN (Hotspot Shield)

3.No long steps

Things Need

1.A video Accelerator (SPEEDbit free one).Here

2.VPN service if YouTube is blocked in your country.(Hotspot Shield in My case).

Process

Install SPEEDbit and start using YouTube Fast.

Android Fast WiFi File Transfer Bluetooth Alternative

noreply@blogger.com (Anonymous) — Wed, 13 Nov 2013 20:10:00 +0000

How To Transfer Files Between Android Phones Using WiFi 20 Times Faster Then Bluetooth Easy And Fast Method

Theory:

One Phone act as AP and other as client choice is yours to whom you make AP or client.

We will use ES File Explorer Here Google Play Link

to transfer files.

You Can Also Transfer Files Between Android and iPhone here by same technique

Things You Need:

1) Two Android Phone Having ES File Explorer installed.

2) At least One Phone Having Portable WiFi Hotspot (Present on almost every Android phone today).

Method:

Open ES File Explorer on both phones.

Press and hold on file you want to send you can send more then one file by ticking on other files and select share from more at lower right corner.

Now select send by LAN

Now you can create a hotspot network (AP ) so that other Phone can connect to it.

Now from other phone Connect to Created Hotspot network (For Example Fawad is WiFi name and 00000000 is password of WiFi to which you have to connect as show in Picture).

Now after connecting to network by WiFi you can transfer files between both Phones by ES File Explorer

Select File/Files and Tap Send

Now Select Phone To Which You Want To Send File (Remember ES File Explore must Be Open on Both Phone)

Select The Location to Save and that's it.

I have Gained Transfer Rate of 1.9MB/s between Acer Android Boot and A5 Classic.

You Can Stream Videos from Your Android Phone to Other Android Phone by using Play To option give it a try.

Hotspot Shield Not Working on Android Get Alternative

noreply@blogger.com (Anonymous) — Wed, 13 Nov 2013 20:07:00 +0000

Alternative To Hotspot Shield For Android and Any Other Devices Supports VPN No Need To Find App For Your Phone

Hotspot Shield is pretty good software for both Computers and Smartphone but on some devices it is not working force close or crashes
Today I came up with a solution which is alternative to it but not less effective then Hotspot Shield it is a simple Peer 2 Peer Tunneling Protocol (PPTP) VPN and supported on a number of Operating Systems (OS) for PC and Smartphone.
You can try it on your own phone on which Hotspot Shield not available or not working.
You don't have to install any software/app on PC/Phone just configure it.
Steps are simple and easy .

Register at a VPN service.
Get Username and Password through email.
Configuration of Device for VPN

Step 1: Registration

Go To Link Here
Type your email address,click agree
click reddish one (left) button and then
click on single button

Step 2 Getting Username and Password:

Check your email account you entered in first step a email will be sent to your given email address in which Username and Password should be mentioned.

Username : XXXXXXX
Password : **********
VPN Server ***.***.***

Step 3 Configuration of Device for VPN:

For Android :

Go to Setting>More>VPN

Setup screen lock

Add a VPN Network

Name: any name

Server address : address in email you received.

uncheck PPP encryption MPPE (if option available).

Save Setting and open created connection.

Enter username and password you received by email.

Check Save account information.

Tap Connect Button

When VPN is connected you can get notification in notification bar.

Now Your Phone is a PTA Restricted Area

Now You can Use YouTube

YouTube By VPN

You can disconnect from VPN by Opening VPN Properties Present in Notification bar or see Picture 6.

For Windows:

Check VPN for Windows Here

General Layout For Every Device :

It will work on every phone which support PTPP VPN connection.

Just create a simple PTPP connection.

Enter IP of server,username and password.

No other extra option to select.

Nothing else.

I gave you one example of this method try one for your phone too.

Use YouTube In Pakistan After Blocking

noreply@blogger.com (Anonymous) — Wed, 13 Nov 2013 19:59:00 +0000

Today i will show you how to use YouTube to watch and download videos after blocking of YouTube by PTA.
Please do not watch any anti-Islamic videos.
Use YouTube to show real Islam for betterment of Islam and Pakistan.

Method 1 Spotflux (For Window,Mac,soon Android)

The latest alternative i found up to now is Spotflux

which is doing well but it also require java to run.

First install java link blow

Windows Offline

then install s

potflux

( Spotflux download link)

Spotflux is free and less ads almost no ads and Internet Download Manager is also working with it

Method 2 Hotspot Sheild(For iPhone iPad Android)

I have also tried hotspot shield which is good too but lot of adds here is the link for windows
Hotspot
just download and install but lots of adds can be blocked by ad blocker
for iPhone iPad Android search you respective app store for Hotspot Shield app.

Method 3 (Universal Method)

How it Works.
First we connect to a Japanese free VPN hosting server which encrypt our internet traffic avoiding caught by PTA web filter and responded to our queries.

We will use dial-up VPN connection over Internet(1 Mbps is recommended speed)

Step 1 Getting Registered on Server

Go to link blow
Here
enter you email address
Click check box to Agree with Terms (Translate Page to read Terms of use)

Click Box

Click First Box

Click Box

E-mail will be sent to your given email address
open e-mail account
read info title email and click on link given in email
you are now registered and ready to use it on any P2P VPN Sported device I Phone,Android Phone,Mac,Windows maybe Linux but not tried

Step 2 Setting up VPN on Windows(Win7)

Open control Panel and click Network Sharing Center

Click set up a new connection

Click connect to a workplace and

Click use internet connection

Enter server address and next

Enter username and password given in second email you revived from site

Click Connect

Waite to Connect

You are Connected Now and ready to use YouTube

Now you can watch and download videos from YouTube.
To download avoid using IDM
use Free YouTube Downloader to download YouTube