Queuing Models in NS2

M/M/1 is a system with poisson arrival time, servicing exponentially and a queue of unlimited capacity and type of FIFO Queue. This is the simplest queuing system.  NS2 supports various distributions like pareto, exponential, constant, unifrom, etc to handle the network dynamics and metrics. So it is very easy to test the given network link to monitor a given queue using any of these queuing models. The listing 3 and 4 are monitoring the link when DropTail queue is used with a capacity of finite and infinite. Listing 13.3 uses infinite capacity and Listing 13.4 uses Finite capacity The output screen shot is shown below the scripts for further understanding
Listing 3 – M/M/1 Queuing Model #new Simulator creation set ns [new Simulator] #trace file creation for capturing the UDP data set tf [open out.tr w] $ns trace-all $tf
#setting the exponential distribution param set lambda 30.0 set mu     33.0
#creation of nodes set n1 [$ns node] set n2 [$ns node] #The queue limit is 1Lakh as the capacity is infin…

ns2 installation in Ubuntu 14.04

This post tells you how to install ns-2.35 in ubuntu 14.04 64 bit Operating system.
NS2 installation in  Ubuntu 14.04

This post also posts a video that shows the installation instructions.
1. There is no audio in this video, please bear with me but these texts will make you understand how the installation is done in linux.
2. Copy the source file into the home folder
/home/pradeepkumar/ns-allinone-2.35.tar.gz3. give this command to untar or unzip the software
    tar zxvf ns-allinone-2.35.tar.gz
    cd ns-allinone-2.35/
This command will take some time to get ns2 installed....
Before step 1, give these commands (These commands will install the developmental libraries like C, C++, Tcl, Tk, etc)
    sudo apt-get update
  sudo apt-get install build-essential autoconf automake libxmu-dev

You may get an error in the ~ns-2.35/linkstate/ls.h file about a small correction in the C++ constructor
change a function erase to this->erase and then try ./install
This is the only error you can experience when installing ns2.35 under any of the OS (Fedora, Ubuntu or Linux Mint)

All your developmental libraries are available in the ns-allinone-2.35/ns-2.35/ folder only (There may be other folders that you do not need at all, all your recompilation, examples, protocols, agents, packets, etc will be under the folder ~ns-2.35/)
Once the installation is over, you need to set the path to make ns and nam works from any terminal.....
To set the path, here are the files
in ubuntu - /home/pradeepkumar/.bashrc
in Linux Mint - /home/pradeepkumar/.profile
in Fedora - /home/pradeepkumar/.bash_profile

So i need to set the path in the file .bashrc (Which will be available in the home folder of my machine)
Now installation is over.... now to set the path

Once the path is set, you need to check whether ns and nam are working. type ns and nam and see whether they are giving any results.
they are not working, as the PATH what we set is not yet sourced
one method is logout and login back or else
try  giving this command

source /home/pradeepkumar/.bashrc (you should not get any errors, if you get then there may be something wrong in the path setting)
!!!!!!!!!!!!!Installation success!!!!!!

 T S Pradeep Kumar

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