RIP Lab Configuration On GNS3:

This is a simple tuttorial for configuring RIP on GNS3, i have create a small lab of three routers and two ethernet switches on GNS3 as shown in network diagram.

RIP routing protocol have simple configuration, you need a just network command to advertised the connected networks.
Configuration for R1:

 R1#conf t

 R1(config)#int s1/0
 R1(config-if)#ip add 100.1.1.2 255.255.255.0
 R1(config-if)#no shut
 R1(config-if)#int s1/1
 R1(config-if)#ip address 20.1.1.1 255.255.255.0
 R1(config-if)#no shut
 R1(config-if)#ex
 RIP Configuration Commands for R1:
 R1(config)#router rip
 R1(config-router)#version 2
 R1(config-router)#network 20.1.1.0
 R1(config-router)#network 100.1.1.0


 Configuration for R2:

R2#config t
R2(config)#int f1/0
R2(config-if)#ip address 172.16.2.1 255.255.0.0
R2(config-if)#no shu
R2(config-if)#int s2/0
R2(config-if)#ip address 100.1.1.1 255.255.255.0
R2(config-if)#no shut
R2(config)#router rip
R2(config-router)#version 2
R2(config-router)#network 172.16.0.0
R2(config-router)#network 100.1.1.0
Configuration for R2:
R3(config)#int s2/0

R3(config-if)#ip add 20.1.1.2 255.255.255.0 

R3(config-if)#int f1/0

R3(config-if)#ip add 10.2.2.1 255.255.255.0

R3(config-if)#ex

R3(config)#router rip

R3(config-router)#ver 2

R3(config-router)#network 10.2.2.0

R3(config-router)#network 20.1.1.0

RIP Verification Commands:

 Show ip route command should display all RIP networks and end to end ping should be successful.

Microsoft Security Essentials Icon Missing From System Tray

I am using  "Microsoft Security Essentials" for a long time on windows 7 and found it a good software against the different threats/viruses.Few day ago MSE icon is suddenly disappear from system toolbar.
I tried different things to solve this e.g.

• Check task Manager but there is no msseses.exe for MSE
• Try to manually start MSE service
• Uninstalled MSE and install again but no result.
• Check notification area icon setting from toolbar/properties/customize, it is selected for show icon    

After trying above steps problem was still there,i sense that this may be because of some virus because i had disable MSE's updated few week ago. I installed another antivirus and after restart and system scan my problem is solved.

FireFox/Internet Explorer/Chrome is not working after Avast boot Scan:

From past few days i had a problem with my "Microsoft Security Essentials", MSE icon is not showing in toolbar. I check task Manager but there are no MSE exe and service running, also try by reinstalling MSE but no result. i guess that this may be because of some virus therefore i installed Avast antivirus, after the installation avast reports some threats/virus found in your system you need a boot scan for complete scan. Therefore i restart my system and after restart avast scan my hole system. When the scan is finish windows 7 is booted and i surprised to see MSE icon is appear at toolbar, but when i open my web browser Firefox to access the internet but Firefox display the proxy server error. i try internet explorer but same results. I check modem setting and ping 4.2.2.2 and found that internet is working fine but web browsers are not opening any site. 

Proxy-error after avast boot scan

 How to fix this Problem:

 I check Firefox setting and found that avast treated firefox as a treat and add a proxy server address as follow

 Since in my home network i don't running any proxy server therefore to fix this you need to selected "no Proxy" from option/network/setting as below

For internet explorer go to internet option/connection/Lan setting and then unchecked the proxy server check box.

 Hope this post will be helpful for you thanks.