Wireless Nuggets

High Density Wi-Fi SSID Considerations – Part 1

2015-12-11T21:23:00.001+00:00

Typically within very high density WiFi deployments we recommend a having a low number of SSIDs particularly in the 2.4 GHz spectrum. We may want to have fewer SSIDs in the 2.4 GHz spectrum than in the 5 GHz spectrum. This is due to the available airtime slots within each specific spectrum. Within this blog try to explain over a few parts in detail the cause and effect of the performance impact of multiple SSIDs within a high density WiFi environment. It will also help to illustrate the importance of a WLAN Policy within the high density WLANs to manage rogue devices and interferers.

In any WLAN environment we have management traffic and control traffic as well as our client data. This management traffic creates an overhead that has an impact on the amount of airtime that we actually have available to send data which is what we built the WLAN for in the first place. The lower our management and control overhead the more airtime we actually have to transmit data. The trade-off is that without the RF management and control traffic we would not have a WLAN to transmit data in the first place but we can take steps to limit this and claw back some of that valuable airtime. If we do not control it we can see very high channel utilisation and saturation with just management traffic and severely degraded WLAN performance.

Generally speaking the most prevalent management and control traffic will be beacons, probes and probe responses which is where we focus this discussion for having a low number of SSIDs particularly in 2.4GHz and tools which we can use to mitigate the issues within the Cisco portfolio

Equally the reason we focus on 2.4GHz is that it is by far the most difficult use case with the prevalence of interferers, the lower number of channels and its higher signal propagation.

In the 2.4 GHz spectrum we have only 3 channels as compared to typically 16 to 20 in 5GHz (depending on your regulatory domain etc), the reason we discuss 12 channels in 5GHz particularly. Therefore we have significantly less available airtime if we were to have an equal number of devices in 2.4GHz as we would in 5GHz.

Typically we are seeing a shift of devices to the 5 GHz spectrum which alleviates a lot of the pain as we have approximately only a fifth of the capacity in 2.4 GHz as we do in 5 GHz or less now with the improved efficiency of 802.11ac.

Defining High Density Wireless

2015-12-11T20:41:00.000+00:00

HD Wi-Fi has become de riguer over the last two years or more and no doubt there will be another flavour of the month soon. The reality of HD Wi-Fi as a feature is different in that it is intangible without an easily definable outcome. Usually a solution will either work or not work, however when you are looking to deploy HD Wi-Fi not all vendors are equal, be that due to the chipset, the features or product portfolio.

For example if you deploy EAP-TLS, bonjour guest access or multicast you have either standards based protocols to work with or a clearly defined goal. The issue is one mans high density is another mans normal density.

People often say they need "high density" and ask if the proposed solution can do "high density". My immediate response is “lets define high density” rather than “of course it can everyone's WLAN solution can do high density”.

High density WLANs, like everything else, can only be tested once installed and tested againstthe design brief. If there is no design brief as to how many clients, what type of clients and what type of applications you are simply unable to measure the success or lack thereof of your implementation. So you must absolutely define how many clients etc you will support.

Lets take a look at what two different people deem as high density Wi-Fi

Option 1 - A WLAN deployment in a busy office with lots of people for voice, video and data where you might get 40 clients per access point and each access point is using omni directional antennas may be described as high density. It certainly is higher than perhaps a normal enterprise WLAN density nad as such may be defined as high density.

On the other hand

Option 2 – A stadium where you have 90000 people and each access point covers 400 seats to provide data, video and location.

Option 1 there is a moderate expectation that you will be successful with many vendors, some more successful than others. I respect that this is not that far away from a pretty standard deployment and most enterprise class WLANs should be able to cope with this.

Lets define the high density environment as 20 seats per cell and 3 devices per seat so we have a maximum design of 60 devices on an access point.

Simply by defining the expected outcome if you have 61 devices and the WLAN fails you have exceeded the design. OK we need to define in more granularity the applications per cell etc so we do not end up with 60 voice clients but our expectation would be a sensible split of clients and applications.

This would provide a reasonable user experience for typical office based applications.

Option 2 where we have a stadium typically we would define the total number of clients we could reasonably expect to have on the WLAN simultaneously at any one time. For this example lets assume 25%. We need to use directional antennas to segregate the RF and we want location and video as well.

Next step is to define the video capabilities and start to manage the customer expectations that it may not work well in all areas. Additionally with location we will not see the granularity that we could expect in an environment that lends itself to a location based deployment.

The requirements in the eyes of the customer are both high density Wi-Fi however the approach, expectation and usage are both very very different and need to be managed differently. Indeed not all vendors would be able to provide a solution for option 2 as very high density WLANs pose many different challenges that you will only see in that type of environment. More vendors perhaps have the capability to solve the challenges of option 1.

Are they both high density or is one simply an extention of the success of Wi-Fi and the growth of devices in the market place and new standards like 802.11ac. All of this coupled with client and user expectation that Wi-Fi is very much commoditised these days means we will always have challenging situations where our Wi-Fi skills and ability to communicate designs successfully will be tested.

What will the next flavour of the month be?

WLC FUS

2012-02-10T17:14:00.000+00:00

This is the first time I have seen Cisco WLC FUS (Field Upgradeable Software), its very much like the old bootloader versions and something you should apply if needed. It is only for code version 7.2.10.3.0 at the present time however there may be future versions, I guess we will have to wait and see.

Field Upgrade Software (FUS) is a special AES package that performs various system-related component upgrades. We recommend that you install FUS to upgrade components such as the bootloader, field recovery image, FPGA/MCU, and other firmware to their latest respective versions.

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Note On a Cisco 5500 Series Controller, it is observed that the controller sporadically reboots and displays the following FPGA error message:

fpga: Lost heartbeat from Environment controller, system will reboot in 5 seconds!!!

A crash file is not created to debug or troubleshoot the error.
You can resolve this issue by installing FUS.

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The table lists the components that are upgraded after you install Field Upgrade Software for various controller platforms.

Components Upgraded
Controller Platform	Components Upgraded
Cisco 5500 Series Wireless Controllers	•Field Recovery Image is upgraded to runtime image version •Bootloader is upgraded to 1.0.16 •Offline Field Diagnostics is upgraded to 0.9.28 •FPGA Revision version is upgraded to 1.7 •Environment Controller (MCU) Image version is upgraded to 1.8 •USB Console Revision version is upgraded to 2.2
Cisco Wireless Services Module 2 (WiSM2)	•Field Recovery Image is upgraded to runtime image version. •Bootloader is upgraded to 1.0.16 •Offline Field Diagnostics is upgraded to 0.9.28 •USB Console Revision version is upgraded to 2.2 Note Due to a software issue, the FPGA does not get upgraded in a WiSM2 controller even though the console output indicates that it has been upgraded.
Cisco Flex 7500 Series Controllers	RAID firmware

Note You must install FUS only if you do not have the versions of the components mentioned above.

Cisco NCS Deployment

2012-02-09T20:54:00.001+00:00

Having deployed the Cisco NCS a few times now I thought I would add a post outlining the steps to get it up and running. Its a little more difficult that the WCS and seems to take a little longer to get up and running. Hopefully this may help one or two people. This relates to the virtual appliance.

The minimum server requirements are available via the datasheet but once you have your hardware and software you are ready to rock. There really is nothing that complicated however make sure you do meet the server requirements for your deployment. If you do not have enough memory, like the first deployment I did, it can be problematic and take a looooooong time to install.

Something to point out is that you need to start the server after the installation, simply use the command "ncs start"

Below are typical screens presented during the NCS implementation

From the VMware vSphere Client main menu, choose File > Deploy OVF Template. The Deploy OVF Template Source window appears:

Choose Deploy from file and choose the OVA file that contains the NCS Virtual Appliance distribution.

Click Next. The OVF Template Details window appears. VMware ESX/ESXi reads the OVA attributes. The details include the product you are installing, the size of the OVA file (download size), and the amount of disk space that needs to be available for the virtual machine (size on disk).

Verify the OVF Template details and click Next. The Name and Location window appears

Either keep the default name for the VM to be deployed in the Name text box or provide a new one and click Next. This name value is used to identify the new virtual machine in the VMware infrastructure so you should use any name that distinguishes this particular VM in your environment.The Host / Cluster window appears

Choose the destination host or HA cluster on which you want to deploy the NCS VM and click Next. The Resource Pool window appears.

If you have more than one resource pool in your target host environment, choose the resource pool to use for the deployment and click Next. The Ready to Complete window appears.

Review the settings shown for your deployment and, if needed, click the Back button to modify any of the settings shown.

Click Finish to complete the deployment. A message notifies you when the installation completes and you can see the NCS Appliance in your inventory.

Click Close to dismiss the Deployment Completed Successfully dialog box.

In the vSphere Client, click the NCS Virtual Appliance node in the resource tree. The virtual machine node should appear in the Hosts and Clusters tree below the host, cluster, or resource pool to which you deployed NCS Virtual Appliance.

On the Getting Started tab, click the Power on the virtual machine link under Basic Tasks. The Recent Tasks pane at the bottom of the vSphere Client pane indicates the status of the task associated with powering on the virtual machine. After the virtual machine successfully starts, the status column for the task displays Completed.

Click the Console tab, within the console pane to make the console prompt active for keyboard input.

At the login Prompt, enter setup.

The NCS configuration script starts. The script takes you through the initial configuration steps for NCS Virtual Appliance. In the first sequence of steps, you configure network settings.

As prompted, enter the following settings:

Hostname for the virtual appliance.
IP address for the virtual appliance.
IP default subnet mask for the IP address entered.
IP address of the default gateway for the network environment in which you are creating the virtual machine.
Default DNS domain for the target environment.
IP address or hostname of the primary IP nameserver in the network.

At the Add/Edit another nameserver prompt, you can enter y (yes) to add additional nameservers, if desired. Otherwise, press Enter to continue.

NTP server location (or accept the default by pressing Enter). At the Add/Edit secondary NTP server prompt, you can enter y (yes) to add another NTP server. Otherwise, enter n (no) to continue.

Enter the username for the user account used to access the Cisco NCS system running on the virtual machine. The default username is admin, but you can change this to another username by typing it here.

Enter the password for NCS. The password must be at least eight characters and must include both lowercase and uppercase letters and at least one number. It cannot include the username or default Cisco passwords. After you enter the password, the script verifies the network settings you configured. For instance, it attempts to reach the default gateway that you have configured.

After verifying the network settings, the script starts the NCS installation processes. This process can take several minutes, during which there is no screen feedback. When finished, the following banner appears on the screen:

=== Initial Setup for Application: NCS ===

After this banner, it starts with database scripts and reboots the server as shown in the console:

Running database cloning script...

logger: invalid option -- l
usage: logger [-is] [-f file] [-p pri] [-t tag] [-u socket] [ message ... ]
Running database creation script...
logger: invalid option -- l
usage: logger [-is] [-f file] [-p pri] [-t tag] [-u socket] [ message ... ]
Setting Timezone, temporary workaround for DB...
Generating configuration...

Rebooting...

Log in as admin and enter the admin password.

Exit the console using the exit command.

Enter the following command to start the NCS Server.

ncs start

CCNP Wireless - IAUWS

2012-02-09T19:48:00.002+00:00

Well I sat and passed the IAUWS exam today, thats the security part. I am pushing hard to complete version 1 of the CCNP Wireless as I have some study materials available and I have been studying on and off for about a year. The only reason I haven't actually taken any of the exams is time.

This exam was a bit of a suprise. The exam blueprint is a great starting point which is available here but I was suprised how much focus there was on wireless NAC. Not an easy exam and you really need to read the documents. Some of the questions, as in any exam I guess were really straight forward but there were that were difficult to understand.

A great deal of material to cover and some tricky areas. A great test though.

802.11ac update

2012-02-06T00:23:00.001+00:00

I briefly mentioned 802.11ac a while ago here however a little more information is now available. At CES this year some vendors demonstarted 802.11ac products. Notably Buffalo with a prototype running a Broadcom chipset. Although this had a mighty 800mbps throughput that really is the tip of the iceberg.

A few highlights.

802.11ac should be backwards compatible with 802.11a/n.
Channel widths will be 80 or 160MHz (802.11n can use 40MHz wide channels) now it remains to be seen exactly which channels these will be and how that can be worked into the current regulatory domains around the world.
Support for 8 spatial streams compared to 802.11n 4 spatial streams. If like 802.11n initial products wont be the full bore 8 spatial streams however and similarly to 802.11n that may be a theoretical maximum, nobody has commercialised a 4 spatial stream device and there are only a few vendors with 3 spatial stream access points.
A massive 256 QAM against 64 QAM for 802.11n.
There will be compatability mechanisms for 802.11ac to coexist with 20 and 40MHz 802.11a/n
Lets not forget MU-MIMO which will let us have multiple devices receiving from a single signal.
Ultimately we all want to know how fast, well 6.93Gbps.

I feel it will certainly speed up the adoption of the 5.0GHz technology, I only hope it does not become as congested as the 2.4GHz spectrum however this may be the leading technology of the future so simply it will be everywhere, consumer electronis included. That will present its own challenges again as we try to support a greater level of legacy devices.

It certainly bodes for an interesting future as a wireless engineer.

CCNP Wireless - CUWSS

2012-02-03T13:34:00.003+00:00

Finally sat down and took the first of my CCNP Wireless exams, and passed.

OK its generally agreed that this probably is not the hardest of the CCNP exams but there are a few questions that could trip you up. Even if you do a lot of surveying there are areas that you will need to know with respect to the WCS planning tool and Cisco Spectrum Expert.

Now I admit that I do not use these tools every day so I spent a little time on WCS and read through the Spectrum Expert stuff.

The Quick learning guide from Cisco Press was great as any areas I was not 100% on I done a little studying.

It probably helped iron out any wrinkles I had as well in best practices etc.

Overall pretty straightforward if you know your stuff.

Already booked IAUWS for later this month and started reading the Quick Learning Guide, I must say there are a few more grey areas than there were for the CUWSS as there are a few things you dont work on often, and some not at all so onwards and hopefully upwards.

CCNP Wireless v2 & CCNA Wireless v2

2012-02-01T02:34:00.001+00:00

Well at first glance looking at the exam topics for each of the exams there does not seem to be a massive amount of change. Each of the exam numbers is incremented by a single digit however the core topics remain largely unchanged.

From converstaions with various people and reading the forums such as CLN the biggest changes are updates due to code. Also how Cisco are approaching the exams is alleged to have changed in some cases quite a lot which could add to the fun.

One of the difficulties I had sitting the CCNA Wireless was remembering how things used to be done and as an entry level exam many candidates will not have seen the older code versions. I think the refresh will make a much fairer environment for the candidates however there is one major issue, no study materials.

Its been a major gripe of most candidates taking the Cisco wireless exams that there is scarecly any training or self study material. Pretty much the same for any wireless vendor exams actually! Without simulators and the need for hands on you need to be working with the equipment or very wealthy to buy a lab and or take the official traing which will have course materials, or like me determined and prepared to make the sacrifices and buy a lab and spend hours looking through the design guides. OK for me its almost a hobby.

The few books that were about for the CCNA Wireless will now be well out of date for the new exam. The CCNP Wireless Quick Reference guides will be equally out of date, that said only three of the four promised were ever released, Cisco Press still says the forth, IUWVN,will be released soon and states January 2011, hmmmm OK.

Well I think the core technologies are still relevant OK we have to forget about LWAPP now, that seems so long ago and think CAPWAP. New features like CleanAir, MSE replacing the Location Appliance etc. Largely I think alot of great information is still contained in these publications and they will help analyse your weaknesses. Once you know your weaknesses its into the design and deployment guides.

Good luck anyone taking these I have my first CCNP Wireless booked for 3/2/2012 which is CUWSS, this I should pass! Then I will take my IAUWS before the end of the month, I really want to get this before I have to start thinking about v2. I migh even dabble in v2 to see how different they are.

CCNP Wireless v2

2012-01-25T23:49:00.002+00:00

Cisco announced the CCNP Wireless v2 earlier this week. Details can be seen here.

I have not had a detailed look at the changes yet but the exams will definitely be more relevant to todays implementations and include the newer feature sets and software versions.

I will look at the key differences over the next few days and post some details

CCIE Wireless Version 2

2011-05-18T20:04:00.001+01:00

Well its finally here after a few months of rumour and speculation the CCIE Wireless version 2 has been announced today. The changes will impact the written and lab exams and brings the CCIE Wireless bang upto date, well as of today anyway, we may have different code versions available when it lands.

The CCIE Wireless v2 will be available from 18th November 2011 which is Cisco standard 6 months advanced notice.

There will be a beta written in July at $50 which is great news however the results of betas usually come out a few weeks after you take it rather than getting the good news on the computer at the end of the exam.

So whats new?

The exam will be written around code version 7.0 MR1 which is bang upto date. SOme things from current code 4.2 will be easier but there are a lot of new features incorporated.

Here is a brief overview at first glance of new things.

VSS - Would be cool to have that in a home lab but I think I might cause a domestic?

Office Extend - not too much of a biggy

CleanAir - Awesome again relatively straight forward

VideoStream - Will be interesting

Context Aware Service

MSE - Hopefully you will be able to get access to this somehow!

Client link

Band select

NAC - Will have to get my head around this as its a big subject in itself depending on how far you need to go.

All in all a great refresh and will be a real challenge, anyone sitting the lab is going to be challenged and busy and it will hopefully stop people thinking wireless is easy. There looks like a lot more but I think the subject matter has been broken down more.

No comment on which version of ACS we will be using and no comment as to wether the OEQs have been dropped which I know for many is quite scary as to fail on just 4 questions is a killer, some people just freeze up a bit on the day or may not articulate exactly enough information on the day.

For more details here are the blueprints written and lab

Cisco Flex 7500 Series Cloud Controller

2011-04-21T01:36:00.001+01:00

Well its landed and for flex connect read H-REAP on steroids, at least thats my take.

The 5508 controller can manage, with the latest code, upto 100 H-REAP groups with 25 access points per group. This new platform can deal with 500 sites and 50 upto 50 access points per group, 2000 access points and 20000 clients.

Licensing should be software upgradeable starting at 300 access points.

There is more information here

Cisco Prime Network Control System (NCS)

2011-04-21T01:09:00.003+01:00

Well this appears to be a simply amazing product on many many fronts.

While there is still little detail available it simply pulls all your network management into a single platform.

With Cisco Prime NCS you can manage upto 15000 Aironet access points but also upto 5000 autonomous access points.

Most importantly it integrates the management of upto 5000 switches for monitoring and trouble shooting.

Additionally it also integrates with Ciscos MSE and ISE.

Simply phenomenal, I am obviously familiar with the WCS and as always with each new release of WCS there is improved usability and functionality and the NCS looks to pull a whole lot of things into a trully unified management platform.

I really can't wait to get my hands on this and see how much it can actually do in the switched infrastructure.

The hardest part of this will be simply understanding the scale of this behemoth, seeing what new features it includes for the WLAN over and above the WCS and the enhanced WLAN capabilities will be exciting and if it can do some good stuff in the LAN infrastructure too it will simply sell itself and also strengthen the sales arguement for Cisco Unified Networks.

You can get more info here

WOW 450Mbps from HP

2011-04-01T02:06:00.000+01:00

HP have launched their new E-MSM460 and 466 along with their E-MSM430. They are probably the first key vendor to market with a 3x3:3 access point giving 450Mbps potential.

The E-MSM430 is only 2 spatial streams meaning 300Mbps but the E-MSM460 and 466 support 3 spatial streams. The E-MSM460 has integrated antennas while on the E-MSM466 you will need to buy the antennas seperatly.

This I am sure will be the first of many cmpeting products and with Intel providing the Intel Centrino Ultimate-N 6300 wireless adapter with 3x3 support its only a matter of time before we start seeing major deployments at 450Mbps.

New Wireless Products From Cisco

2011-04-01T01:44:00.002+01:00

Well its been a long wait but there are a few new products available now from Cisco within their wireless portfolio which will only make wireless networking more exciting in the future as its always a race to give the best performance and innovation in this fast paced arena.

OK there may be other similar products out there and some may argue that company A is better than company B but I do perceive Cisco as having the greatest breadth and depth in their offering.

Here is s snapshot of whats new

Cisco 2500 Series Wireless LAN Controller

Basically 4 flavours 5, 15, 25 and 50 accesspoint models
Software license upgrade for more access points in 5 and 25 access point increments
Support for Office Extend
Four 1Gbps Ethernet (RJ-45)

Cisco Wireless Services Module 2 Controller for Catalyst 6500 Series Switches

Supports 100, 300, and 500 access points with software licensing flexibility and all the usual features such as Office Extend etc

Cisco Wireless Controller on Cisco Services-Ready Engine

Very similar in features to the 2500 integrates int the ISR G2 routers, obviously without the Gig ports.

Cisco Aironet 600 Series OfficeExtend Access Points

This dual-band, 802.11n access point extends the corporate network to the home teleworker and mobile contractors. The access point connects to the home's broadband Internet access and establishes a secure tunnel to the corporate network so that remote employees can access data, voice, video, and cloud services for a mobility experience consistent with that at the corporate office.

Cisco Aironet 1550 Series Outdoor Access Point

The Cisco Aironet 1550 Series with Cisco CleanAir technology provides the highest-performance 802.11n connectivity for mission-critical outdoor networks by detecting interference from unauthorized devices, as well as common outdoor interference sources such as WiMAX networks and wireless bridging products.

I'm sure there will be other products around the corner as they continually develope their portfolio but its just as interesting to see where these fit against competitors and how the market all gels together.

Linksys E4200

2011-02-02T00:47:00.006+00:00

Cisco or rather Linksys have launched a new wireless router for the home. Its a great looking piece of kit with awesome performance. I certainly won't complain if one arrives in the post for review!

Its not on the Linksys UK website yet but I am sure it will be soon enough.

Click here for more information

In the 5.0GHz spectrum it gives you 3 spatial streams an what that means is 450Mbps, you can also channel get 300Mbps in the 2.4GHz spectrum.

Here are the highlights

•Simultaneous dual-band for high performance wireless entertainment
•Maximum speed (300 + 450 Mbps) for ultra-fast wireless transfer rates
•Gigabit Ethernet (10/100/1000 Mbps) ports for 10x faster wired speeds
•USB Storage Port for centralized file sharing with built-in UPnP AV media server
•Full 3x3 MIMO antenna array for maximum range and reliability

Wireless-N Technology
Built with leading 802.11n wireless technology. The Linksys E4200 offers maximum speed and range to create an ultra-powerful network designed for home theater performance. Connect your computers, Internet-ready TVs, game consoles, and other Wi-Fi devices at transfer rates up to 300 + 450 Mbps for an unrivaled experience.

The Power of Dual-Band
Double your network bandwidth with simultaneous dual-band N (2.4 and 5 GHz) designed to avoid interference and optimize throughput for smoother and faster HD video streaming, file transfers, and wireless gaming.

SpeedBoost
High-power amplifiers increase signal strength across greater distances for maximum wireless coverage and in-home mobility.

State-of-the-Art Security
Keep Wi-Fi freeloaders and Internet threats at bay with WPA/WPA2 encryption and SPI firewall to help keep your network protected.

Benefits of Gigabit
Use the four Gigabit Ethernet (10/100/1000) ports for quick file sharing, 10x faster than standard Ethernet, between other Gigabit-enabled devices like computers, hard drives, and servers.

Built-in USBPort and UPnP Media Server
The USB Storage Port lets you add an external USB drive to your network and share files at home or over the Internet. Plus, a built-in UPnP AV Media Server for seamless streaming of your video and media files to an Xbox 360, PS3, or other UPnP compatible device.

Home Theater Ready
Bring the ultimate entertainment experience to your home by connecting computers, Internet-ready TVs, game consoles, media players and more to your wireless network and the Internet. Simultaneous dual-band N and QoS traffic prioritization technology delivers maximum speed and performance so you can enjoy fast downloads, smooth video and music streaming, and lag free gaming and VoIP.

Quick to Install
Cisco Connect software helps you set up in three easy steps and your secure wireless network is ready to go.

Easy to Manage
Cisco Connect software helps you customize your settings, and quickly add multiple devices to your network:

Create a separate, secure, password protected network for guests
Limit access time and websites with Parental Controls
Easily access advanced network settings

ASA in GNS3

2010-12-29T17:47:00.000+00:00

Well I have been playing about with GNS3 a little ove the holidays and looking at how it works. I must say that it is user freindly for some things such as routers but other thing, oh boy can it be troublesome.

GNS3 does not natively support switches, ok I think we all knew that. It does however let you add a switch module to your routers and I will be playing with this a little.

Its when you look at GNS3 and what it can do that you really really start to delve deep into it.

I had the pleasure or misfortune of deciding that if I want to look at security later in the year how good would it be to get te ASA working in it.

Well that in and of itself was a challenge but I managed to get it working. OK I still have a minor issue in that I am unable to save my configs but from a lab perspective thats no big deal as all it really means is having to type everything in again and again. Well hey thats what i would do anyway so I can cope with that. I could also save the configs to a text file.

I also dont have it working in multiple context at the moment but hey little steps. Considering I have no experience currently just getting used to setting one up will be a big step.

Then however I decided to get ASDM working, that was not too hard but you rereally need it working as thats the straight forward way to setup an ASA. Well I managed to get it working at last, the trick there is to use Fiddler but as it intercepts we traffic and sends it to the ASA it screws up your ability to browse the internet.

OK at the end of the day I can practice on it and get some use but I will still probably but and ASA.

Before anyone asks I will not be doing a write up of how to install it ananytime soon. Firstly I want to get all the gremlins sorted, seconly I have other things to focus on, thirdly I really like cables and devices so will practice on a real ASA when the time comes, ASA in GNS3 is a nice to have but GNS3 is really for routers in my humble opinion.

Just a cautionary note, there is an aweful lot of stuff on the internet about getting ASA to work in GNS3, much of it is absolute bollocks I am afraid to say, its pretty straight forward if you have the right stuff as I found out but I still have gremlins. Have fun sorting out the wheat from the chaff.

Here is a link to help you get started ASA on GNS3

CSCth51156 - Extracting Custom Web Authentication Tar Package May Fail on 5500 WLC

2010-12-23T23:22:00.000+00:00

Well I came across a bug that really threw me, basically all those years making tar files and now I had to find a Unix tool to do it. I didn’t use gnuwin32 as it was a nightmare to find and install but Cygwin was awesome, loaded staright away and had my head around it in about 30 minutes.

Also you need to purchase PowerArchiver which I always hate buying software when there are free options available.

Symptom:
When running 7.0.98.0 WLC code on a 5508 WLC, the tar extraction process may fail generating the following error:

Error extracting webauth files.

Conditions:
This condition only occurs on a 5508 running the 7.0.98.0 code. The same
package can be loaded on a 4404 running 7.0.98.0 successfully, and also to a 5508 running 6.0.196.0.

Workaround:
Create .tar package using the following command on UNIX or Windows (via
http://gnuwin32.sourceforge.net/packages/gtar.htm):
tar -cvf login.tar < file1> < file2> < file#>...

PowerArchiver 2010 for Windows (GUI) - Package as Tar, Store

CCNP Route

2010-12-12T15:54:00.002+00:00

Well blogging has taken a bit of a back sat over recent months as I have been really busy with work. However now there is a little hiatus its back to studying.

I was really lucky to be invited onto a Cisco CCNP Route Beta course delivered over the web which was interesting. first the course content was excellent as was the presenter. However it was difficult to stay focused on a webinar for 8 hours a day over 5 days.

That said it certainly filled some knowledge gaps and gave me an understanding of all the content.

Some of the ROUTE content terified me, notably BGP and OSPF which is not good as thats half the course. However I feel alot more confident now that I have some knowledge to build on and neither looks too scary. That said I have a lot to learn.

As well as hopefully posting a bit more on wireless which is my first love I will also post on my CCNP endeavours which will help me memorise the various parts.

For studying I have my lab and GNS3 and will be using some Trainsignal vidos along with Odoms CCNP ROUTE book and the CCNP ROUTE Lab book. I hope thats enough to see me through!

Time scales, well thats a hard question to answer but I am giving myself 6 weeks of hard study to get to grips with it and then review where I am upto. Starting off listening to all the videos and reading the book while doing some labs to aid understanding. Then just lots of labs and back to the videos before the exam.

Juniper to buy Trapeze - Official

2010-11-19T21:10:00.004+00:00

Earlier this week Juniper announced it is to buy Trapeze Networks. Below is a link to the announcement.

I am sure this can only be good news for Trapeze, juniper and the wireless industry as a whole.

http://forums.juniper.net/t5/The-Network-Ahead/Juniper-to-Acquire-Trapeze-Networks-What-It-Means/ba-p/62475

Whats next?

2010-11-12T12:46:00.001+00:00

Well over the last few months some of the things I have wanted to study have been on the back burner as I was really struggling wiith the CCDA, now thats out of the way I can focus on a few things.

I have to take my CCNP R&S for career developement which is fine, just do not want to tackle another design exam. I struggle with business goals, technical goals etc and how they differ from constraints, sometimes the differences are subtle. The CCNP wil be a milestone, the ROUTE xam is the one I will struggle with most bu I have done a littel studying and its actually making sense.

My wireless exams I will get though as time permits as there are quite a few of them. CWNA, CWSP and the two new exams from the good people at CWNP and also the CCNP Wireless.

The CCNP R&S is going to take up much of my study time and I will be labbing alot, the CCNP Wireless I should be able to get through pretty easily. The CWNP exams well I think they are a different level as they test your understanding of the core concepts rather than deployment so I have to make sure my concepts are solid. Good thing is I know where I need to focus and I understand all of the wireless stuff unlike the CCNP R&S some of which has me scratching my head.

All in all i have about 12 or 13 exams to do, will it be worth it in the end? Well I guess I can only answer that later when I am getting towards my goals. At the end of the day its a journey not a destination.

Passed AWLANSE

2010-11-12T12:20:00.000+00:00

Well after last week taking the CCDA I sat the AWLANSE today and passed. I didn't want to take it on the same day as my CCDA as I was under so much pressure with the CCDA it was untrue.

The exam was not hard but alot of the questions were a little dated, nothing at all on 802.11n and quite a bite on the WLSE, which I have only seen two of and do not like working with.

All in all a fair test but if you don't read wireless guff as a hobby, particularly Cisco it will be a struggle to study for as there is no real training material apart from the Cisco course.

Quite a few of the questions had me scratching my head and there were a lot of questions for a 75 minute exam. It was either know it or guess and move on.

Passing this also achieves a career milestone for me which I am really pleased about.

Passed CCDA

2010-11-05T15:39:00.000+00:00

I have finaly passed my CCDA, not sure how to descrbe it as I was so worried perhaps I over prepared.

I studied for about 3 months, hence no blogging, and thought I wasn't ready but had to sit it anyway as the syllabus is changing thought "what the hell" and went for it.

Well I went along and did quite well in all areas.

It is a tough exam don't get me wrong but this is the one I have been avoiding for so long it has held me back in other areas.

Now its AWLANSE next week and a proper start on my CCNP and CCNP Wireless.

Just so glad that hurdle is over as it is well outside my comfort zone.

Lab update

2010-07-13T23:05:00.001+01:00

I have taken delivery of an AIR-WLC4402-12-K9 from my great freind George Stafanck. This will allow me to get a lot more practice with senarios using the later code versions, my existing controller is an AIR-WLC2006-K9 which will not run later codes.

The main advantage of the 4402 is being able to setup guest access in a DMZ which I could never test with the 2006. Obviously there is additional functionality from the later codes.

I still want to add another controller but that will probably be a 2106 or a newer variant thereof if one is released soon, however the code would not be downgradeable to 4.2 which is the CCIE Wireless code.

Its very much a can of worms as there is a strong rumour that the CCIE Wireless will change next year which will mean a code change so its difficult to know what to add.

Anyway thats a brief update, however I am extremely busy at work at the present time so do not have a great deal of time to lab but will hope to get some time this weekend to test a few things out.

I need to start running scenrios more with Windows 2008 and take a serious look at ACS 5.1 as apparently its very different. Always a challenge I guess.

I will post a few lab pics later in the week.

All you need to know about wireless - Einstein

2010-07-12T17:46:00.001+01:00

You see, wireless is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is there is no cat.

—Albert Einstein

If its on the exam you can have my house

Cisco WLC Software Advisory

2010-06-21T01:59:00.001+01:00

Software Advisory – Wireless LAN Controller Software

Base Code: 6.0.182.0, 6.0.188.0, 6.0.196.0

Platforms: 2100 / 4400 / 5500 / WiSM / WLC3750 / WLCM

This Software Advisory Notice is issued against all the above Wireless LAN Controller software versions due to the following bugs:

CSCtf34858 Client can't transmit traffic if it reassociates to an AP within 20 sec

CSCte89891 Radio may stop transmitting beacons periodically

Special Build: Following options are available:

1. Move to 7.0.98.0 Release posted on CCO. Please note, 7.0 is a new feature release.

2. Contact TAC to get a 6.0 Special or Beta release with fixes for the bugs below.

3. Wait for the CCO release of 6.0 MR3 (Maintenance Release), which is planned for July/August 2010