Install NS2 in ubuntu

This post will help you in installing Network Simulator 2 version NS2.35 in Ubuntu 11.10

Instructions

Install Ubuntu
Download NS-2.35 (http://sourceforge.net/projects/nsnam/files/allinone/ns-allinone-2.35/ns-allinone-2.35.tar.gz/download)
Unzip or untar it to any folder (recommended is /home/loginname) using the following commands one by one
sudo apt-get update

sudo apt-get build-essential autoconf automake libxmu-dev

tar zxvf ns-allinone-2.35.tar.gz

cd ns-allinone-2.35

./install

Once installed the PATH information will be provided to you.
Copy the PATH and LD_LIBRARY_PATH Variable to .bashrc (see a dot in the beginning)
Input the path information in .bashrc file like this

export PATH=$PATH:

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH: here.

Once done, save the file and close

execute the command

source .bashrc

try ns or nam to see whether your installation succeeded.