INSTALL NS 2.35 ON UBUNTU 12.04 LTS

                              INSTALL NS 2.35 ON UBUNTU

Step 1:Make it sure that internet connectivity is good.Download NS2.35 from
http://www.isi.edu/nsnam/ns/

Step 2:make a new folder [ns] in /home/Extracts downloaded files in above folder.

Step 3 :copy downloaded ns-allinone-2.35.tar.gz in /home/ns/

Step 4 :open terminal

Step 5:Run following commands
cd ns-allinone-2.35

sudo apt-get update

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

Step 6 :Run following command
./install

Step 7:Run following command to install X – graph
$ sudo apt-get install xgraph

Step 8.Set environment variables by run this command
gedit ~/.bashrc

Add the following lines to the end of the file. Remember replace "/your/path" by the folder where you have stored extracted the ns-2 file (For example, if your Linux account name is purple, and you have extracted the file to your home directory, you have to change /your path to /home/ns)
# LD_LIBRARY_PATH
OTCL_LIB=/your/path/ns-allinone-2.35/otcl-1.13
NS2_LIB=/your/path/ns-allinone-2.35/lib
X11_LIB=/usr/X11R6/lib
USR_LOCAL_LIB=/usr/local/lib
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$OTCL_LIB:$NS2_LIB:$X11_LIB:$USR_LOCAL_LIB
# TCL_LIBRARY
TCL_LIB=/your/path/ns-allinone-2.35/tcl8.4.18/library
USR_LIB=/usr/lib
export TCL_LIBRARY=$TCL_LIB:$USR_LIB
# PATH
XGRAPH=/your/path/ns-allinone-2.35/bin:/your/path/ns-allinone-2.35/tcl8.4.18/unix:/your/path/ns-allinone-
2.35/tk8.4.18/unix
NS=/your/path/ns-allinone-2.35/ns-2.35/
NAM=/your/path/ns-allinone-2.35/nam-1.14/
PATH=$PATH:$XGRAPH:$NS:$NAM

Step 9 :run following command
source ~/.bashrc

Now you can run your ns with ns command...
The "%" symbol appears on the screen. Type "exit" to quit.