Queuing Models in NS2

Image
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 (Network Simulator 2) in Fedora 18

This post helps the developers to install NS-2.35 version in Fedora 18.

Settings:

  • I have used GNOME Desktop with all softwares selected. See the image below
  • From Fedora 18, a new type of installer is designed as shown.

WP_000120

The default installer of Fedora 18 does not install all the softwares that are needed for X Software development, so we need to download those softwares.

Installation of NS-2.35

  • Open Terminal, Give the following command one by one
    • su (press enter and enter your root or super user password)
    • yum groupinstall "X Software Tools"
    • exit (to come out of root user mode)
  • Once installed, download the NS-2.35 allinone software from the following link. https://dl.dropbox.com/u/24623828/ns-allinone-2.35.tar.gz
  • Copy that file to /home/pradeep (This is my home folder)
  • Open terminal again and execute the following commands one by one
    • tar zxvf ns-allinone-2.35.tar.gz
    • cd ns-allinone-2.35
    • ./install (this is dot slash install)
  • You may possibly get one error during your installation is linkstate/ls.h error
  • If you get the above error, open the file (~ns-2.35/linkstate/ls.h) using gedit or any text editor
  • Go to line number 137 and change this line (void eraseAll() { erase(baseMap::begin(), baseMap::end()); })  to

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

  • again you try the command ./install and this time the installation will be successful.
  • Once installed the PATH information will be provided to you.
  • Copy the PATH and LD_LIBRARY_PATH Variable to /home/pradeep/.bash_profile (see a dot in the beginning)
  • Input the path information in .bash_profile file like this

    export PATH=$PATH:<Place your paths here>

    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH: <place the LD_LIBRARY_PATHS> here.

    Once done, save the file and close

    execute the command

    source .bash_profile

    try ns or nam to see whether your installation succeeded.

Popular posts from this blog

AWK Scripts for NS2 to process data from Trace Files

Xgraph

LEACH protocol installation in ns2 (ns-2.35)