Queuing Models in NS2

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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…

Installing ns-2.35 in Ubuntu 12.04 LTS

As you know Ubuntu 12.04 launched on 26th April 2012 and it is a Long Term Support OS.  To install ns2 in Ubuntu 12.04, it refers the same step as done in 11.10 OS.  For new users, here are the steps to install ns2.35

  1. Download NS-23.5 from http://www.isi.edu/nsnam/ns/
  2. Go to terminal and install the necessary updates using the command “sudo apt-get update”  (without Quotes)
  3. Then install the ns2 required libraries using the command “sudo apt-get install build-essential autoconf automake libxmu-dev” (without quotes)
  4. Untar the downloaded ns-allinone-xxx.tar.gz file using the command “tar zxvf ns-allinone-2.35.tar.gz”
  5. execute the commands one by one as given below

cd ns-allinone-2.35

./install

(You get the PATH information if the installation was successful, upon succeeding set the PATH in the relevant file .bashrc)

Type ns and see a  % symbol indicates that the installation of ns2 is successful and also try the command  nam so that a network animator will be opened.

For any doubts, please raise a comment in the following column. I am there to help you. If you try to install ns2 which comes along with the synaptic package manager, you cannot write new modules and recompile it. In that case, you need to use the above method of installation

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