Networker's BLOG

MS How To's

2008-03-30T20:34:00.001-07:00

MS TUTORIALS How To: Create FTP ServerHow To: Change Proxy per User AccountHow To: Creating Policies using ADHow To: Create Users and GroupsHow To: Client join the DomainHow To: Installing Active Directory, Domain Contro...How To: Configuring DHCP ServerHow To: Installing DHCP Server

Linux How To's

2008-03-30T20:33:00.001-07:00

Tutorials How To: DHCP Server (1) How To: DHCP Server Logs (1) How To: MySQL Server Installation (1) How To: Apache Web Server (1) How To: Caching DNS (1) How To: IPTABLES Configuration (1) How To: IPTABLES Installation (1) How To: IPTABLES Scenario 1 (1) How To: IPTABLES Scenario 1.1 (1) How To: IPTABLES Scenario 2 (1) How To: IPTABLES Scenario 2.1 (1) How

Network Tip No. 40: Show Available Memory

2008-03-30T20:28:00.000-07:00

Show Used and Available Memory of your Cisco router or switch A router can be limited by its available memory. To show the used and available memory, Router#show proc mem At the beginning of the output, look for a line like this: Total: 200234528, Used: 70508188, Free: 129726340

Network Tip No. 39: Show Processor Load

2008-03-30T20:26:00.000-07:00

Show proccessor load of your router or switch,which can be limited by its processing power. To show the processor utilization,Router#show proc cpuAt the beginning of the output, look for a line like this:CPU utilization for five seconds: 37%/30%; one minute: 39%; five minutes: 40%

Network Tip No. 38: CLI Editing Tips

2008-03-30T20:18:00.000-07:00

Learn the command-line editing keys.Control A Goes to the beginning of the lineControl E Goes to the end of the lineControl K Deletes everything to the right of the cursorControl P Recalls the previous command in the history bufferControl N Recalls the next command in the history buffer

Network Tip No. 37: ACL on DNS

2008-03-30T20:16:00.000-07:00

No browsing....A common access-list pitfall is when people forget to allow DNS (Domain Name Servers) from their internal network to the provider's DNS servers. Mainly this is a problem on home or small office routers where you might not have an internal DNS server running. The following command allows DNS access from your hosts to the outside DNS server. In this example, our outside DNS

Network Tip No. 36: ACL on ICMP

2008-03-30T20:09:00.001-07:00

Some are having some problems on the ICMP access-list. Try this oneallow pings into the network access-list 110 permit icmp any any echo ! allow ping responses access-list 110 permit icmp any any echo-reply ! allow ICMP source-quench access-list 110 permit icmp any any source-quench ! allow path MTU discovery access-list 110 permit icmp any any packet-too-big ! allow time-exceeded

Network Tip No. 35: Stopping the router from crazy output

2008-03-30T20:04:00.000-07:00

Stopping the router from crazy output... An annoying problem output everytime you mistype a command and the router thinks you just typed a hostname. For example: Router#shwo Translating "shwo"...domain server (10.1.1.1) % Unknown command or computer name, or unable to find computer address Router# The way to handle this is to change the preferred transport method: ! Console port line

Network Tip No. 34: The reload command

2008-03-30T19:58:00.000-07:00

When everything fails.... hehe Router#reload in 3 Reload scheduled in 3 minutes Proceed with reload? [confirm]y

Linux Tip No. 36: How to Enable IP Forwarding

2008-03-26T22:48:00.000-07:00

Enable IP Forwarding1. Check if IP Forwarding is enabledUsing sysctl: [root@proxy ~]# sysctl net.ipv4.ip_forwardnet.ipv4.ip_forward = 0 or just checking out the value in the /proc system: [root@proxy ~]# cat /proc/sys/net/ipv4/ip_forward0 Value 0 means it is disabled. 2. Enable IP Forwarding on the fly [root@proxy ~]#sysctl -w net.ipv4.ip_forward=1 or [root@proxy ~]#echo 1 > /proc/sys/net/ipv4/

Linux Tip No. 35: Enable service at boot up

2008-03-26T21:18:00.000-07:00

To Check:[root@jepoy ~]# chkconfig --list |grep httpdhttpd 0:off 1:off 2:on 3:on 4:on 5:on 6:offTo enable at boot up:[root@jepoy ~]# chkconfig httpd on

Linux Tip No. 34: How to Check Services

2008-03-26T21:14:00.000-07:00

This command is used to start/stop your services.service start/stop/restart/statusTo Start:[root@jepoy ~]# service httpd startTo Stop:[root@jepoy ~]# service httpd stopTo Restart:[root@jepoy ~]# service httpd restartTo check:[root@jepoy ~]# service httpd status

Linux Tip No. 33: How to check your DHCP server

2008-03-24T01:52:00.000-07:00

This command tells you what DHCP server you are using.[root@jepoy ~]# grep dhcp-server-identifier /var/lib/dhcp/dhclient.leases option dhcp-server-identifier 192.168.0.254;

Linux Tip No. 32: Checking the top 10 directories

2008-03-24T01:49:00.000-07:00

Top 10 directories eating up your disk space:[root@mail etc]# du -cksh * | sort -rn | head -10852K sysconfig784K termcap704K selinux704K makedev.d632K firmware552K X11544K pam.d472K prelink.cache460K alsa444K postfix

Linux Tip No. 31: Renew/Release DHCP client

2008-03-24T01:37:00.000-07:00

[root@proxy ~]# dhclient -r[root@proxy ~]# dhclientInternet Systems Consortium DHCP Client V3.0.2Copyright 2004 Internet Systems Consortium.All rights reserved.For info, please visit http://www.isc.org/products/DHCPThe -r flag explicitly releases the current lease, and once the lease has been released, the client exits.

Network Tip No. 33: Troubleshootin IGRP

2008-03-23T20:18:00.001-07:00

Troubleshooting IGRP Issues Router#debug ip igrp events Shows all IGRP events in real time Router#debug ip igrp transactions Shows IGRP updates between routers

Network Tip No. 32: IGRP Routing Optional Commands

2008-03-23T20:17:00.001-07:00

IGRP Routing: Optional Commands Router(config)#no router igrp as-number Disables the IGRP routing process Router(config-router)#no network w.x.y.z Removes network w.x.y.z from the IGRP routing process Router(config-if)#bandwidth x Sets the bandwidth of this interface to x kilobits to allow IGRP to make a better routing decision Router(config-router)#variance x Allows

Network Tip No. 31: IGRP Routing Commands

2008-03-23T20:14:00.000-07:00

IGRP Routing: Mandatory Commands Router(config)#router igrp as-number Enables IGRP routing process. The autonomous system number (AS-number) used in the IGRP routing process must match all other routers that are going to share routing updates in order for communication to take place Router(config-router)#network w.x.y.z w.x.y.z is the network number of the directly connected

MS How To's

2008-03-23T20:09:00.000-07:00

http://howtowindows.blogspot.com/

Linux How To's

2008-03-23T20:07:00.000-07:00

http://howtonixnux.blogspot.com/

Linux Tip No. 30: Managing Disk Space

2008-03-18T18:39:00.000-07:00

[root@mail ~]# fdisk -lDisk /dev/sda: 36.4 GB, 36419584000 bytes255 heads, 63 sectors/track, 4427 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System/dev/sda1 * 1 63 506016 83 Linux/dev/sda2 64 3905 30860865 83 Linux/dev/sda3 3906 4427 4192965 82

Linux Tip No. 29: Becoming a Super User

2008-03-18T18:33:00.000-07:00

Becoming Super User (The su Command)[docadmin@mail ~]$ suPassword: ******[root@mail docadmin]#When you are prompted, type in the root user's password. The prompt for the regular user ($) will be changed to the super user prompt (#). At this point, you have full permission to run any command and use any file on the system. However, one thing that the su command doesn't do when used this way is

Linux Tip No. 28: Command-Line Recall

2008-03-18T18:28:00.000-07:00

Command-Line Recall After you type a command line, that entire command line is saved in your shell's history list. The list is stored in a history file, from which any command can be recalled to run again. [docadmin@mail ~]$ history 20 526 exit 527 su - 528 cd /etc 529 more inittab 530 exit 531 su 532 lspcis 533 lspci 534 su 535 su - 536 su 537 su - 538 su - 539 su

Network Tip No. 30: RIP Version 2: Optional Commands

2008-03-18T18:26:00.001-07:00

RIP Version 2: Optional Commands Router(config-router)#no version 2 Changes back to RIP-1 Router(config-router)#version 1 Changes RIP routing to RIP-1 Router(config-router)#no auto-summary RIP-2 summarizes networks at the classful boundary. This command turns autosummarization off Router(config-router)#auto-summary Re-enables autosummarization at the classful boundary

Network Tip No. 29: RIP Version 2: Mandatory Commands

2008-03-18T18:25:00.000-07:00

RIP Version 2: Mandatory Commands Router(config)#router rip Turns on the RIP routing process; the same command as used for RIP Version 1 (RIP-1) Router(config-router)#version 2 Turns on Version 2 of the routing process. Version 1 is default Router(config-router)#network w.x.y.z w.x.y.z is the network number of the directly connected classful network you want to advertise