NS2 INSTALLATION IN UBUNTU 20.04

 Hello, this post explains how to install ns2 in Ubuntu 20.04. 

1) First you have to download ns2 all-in-one package from following link;

•   http://sourceforge.net/projects/nsnam/files/allinone/ns-allinone-2.35/ns-allinone-2.35.tar.gz/download

2) Extract the downloaded zip file 'ns-allinone-2.35.tar.gz file' to home folder.

3) Now you need to download some essential packages for ns2,these packages can be downloaded by using the following commands : applications>accessories>terminal or dashhome>terminal  and then type the below lines one by one on the terminal window

• sudo apt-get update
• sudo apt-get dist-upgrade
• sudo apt-get update

4) Install the basic libraries;

• sudo apt install build-essential autoconf automake libxmu-dev

5) Install gcc and g++ and for that please do following;

open the file using sudo mode

• sudo nano /etc/apt/sources.list

Include the following line in list; 

• deb http://in.archive.ubuntu.com/ubuntu bionic main universe

then open terminal and execute commands;

• sudo apt update
• sudo apt install gcc-4.8 g++-4.8

For NS2.35 you can use gcc and g++ version up to 5.4

if 4.8 isn't working try installing gcc-5 and g++5. then at the step where you modify the Makefile.in , use gcc-5 instead of gcc-4.8 and so on.

6) Navigate to the ns2 folder and  modify the following make files.

1. ~ns-2.35/Makefile.in

• Change @CC@ to gcc-4.8
• Change @CXX@ to g++-4.8

browse following files and replace everywhere as shown;

1. ~nam-1.15/Makefile.in
2. ~xgraph-12.2/Makefile.in
3. ~otcl-1.14/Makefile.in

• change @CC@ to gcc-4.8
• change @CPP@ or @CXX@ to g++-4.8

Note: If you have a different gcc or g++ version, please change accordingly.

Now Open the following file: ~ns-2.35/linkstate/ls.h and change line no 137;

• void eraseAll() { erase(baseMap::begin(), baseMap::end()); }

to

• void eraseAll() { this->erase(baseMap::begin(), baseMap::end()); }

7) Now change your directory and type the following codes in the command window to install NS2 from a new terminal. 

• cd ns-allinone-2.35/
• ./install

  The installation procedure will take a few minutes..........

8) For setting the path; Open a new Terminal and type

• gedit .bashrc 

Paste the following lines

• export PATH=$PATH:/home/<username>/ns-allinone-2.35/bin:/home/<username>/ns-allinone-2.35/tcl8.5.10/unix:/home/<username>/ns-allinone-2.35/tk8.5.10/unix

• export LD_LIBRARY_PATH=/home/<username>/ns-allinone-2.35/otcl-1.14:/home/<username>/ns-allinone-2.35/lib

9) Save and close the text editor and then type the following command on the terminal

• source  .bashrc

10) Close the terminal window and start a new terminal window and now change the directory to ns-2.35 and validate ns-2.35 by executing the following command ( it takes 30 to 45 minutes)

• cd ns-2.35
• ./validate

11) If the installation is successful, then you will be able to see % at the command prompt while typing the following command

• ns

12) Now type

• exit