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 Network Simulator 2 (ns-2.35) in Ubuntu 13.10 (64 bit)

This post will tell the installation steps for NS2 under Ubuntu 13.10.
Step 1:  Download NS2 package (ns-allinone-2.35)
Step 2:  Copy the file to /home/pradeep folder (you can use your corresponding home path).
Step 3:  Open the terminal and execute the commands one by one

  • Prompt:- sudo apt-get install build-essential autoconf automake libxmu-dev  (all these packages may not be needed, but install all the above for a safer installation of ns2)
  • Prompt:- tar zxvf ns-allinone-2.35.tar.gz
  • Prompt:- cd ns-allinone-2.35
  • Open the file (~ns-2.35/linkstate/ls.h)  using gedit or vi or vim and in line number 137 and change the following line
    void eraseAll() { erase(baseMap::begin(), baseMap::end()); }
    to
    void eraseAll() { this->erase(baseMap::begin(), baseMap::end()); }
  • Prompt:- ./install 
ns2.35 on ubuntu
ns2.35 on ubuntu

Once the installation is completed you may see the screen like the image given below.
Copy the PATH and LD_LIBRARY_PATH information in to your variable, you may use the /home/pradeep/.bashrc file and copy and paste the PATH and LD_LIBRARY_PATH as shown below.
PATH information in Ubuntu
PATH information in Ubuntu
type ns or nam in the terminal to check whether it is working or not.
For ns, a % symbol indicates the successful installation of NS2
for nam, an animator window will be popping out which indicates the sucessfull installation of NAM. 

Thats it: Try yourself to install and let you comment below for the successful installation

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