Cisco LAB

GNS3 is a graphical network simulator that allows simulation of complex networks.  GNS3 is an excellent complementary tool to real labs for network engineers, administrators and people wanting to study for certifications such as Cisco CCNA, CCNP, CCIP and CCIE.

Install dependencies

$ sudo apt-get install python qt4-dev-tools pyqt4-dev-tools

Download  and unzip GNS3

$ cd  /opt
$ sudo  wget
$ sudo tar -xjvf GNS3-0.8.3-src.tar.bz2
$ sudo mv GNS3-0.8.3-src  GNS3

Preparing folders

$ cd GNS3  
$ sudo mkdir Dynamip  
$ sudo mkdir Images  
$ sudo mkdir Project 
$ sudo mkdir tmp 
$ sudo chmod o+rw -R ./Project

Download Dynamips

$ cd Dynamips
$ sudo wget    \            dynamips-0.2.8-RC2-amd64.bin
$ sudo chmod +x dynamips-0.2.8-RC2-amd64.bin

start GNS3

$ gksu python “/opt/GNS3/gns3″

Set up  GNS3
Edit -> Preferences