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NS2 download

In this section we are going to discuss about the basics of ns2.Example program for network simulator 2.Ns2 is a open source software and can be freely downloaded and utilized for Research Purpose.

Quick Intro about NS2 ( Ns2 simulator):

• NS2 is a discrete event simulator targeted at networking research.
• NS2 is an object oriented simulator, written in C++, with an OTcl interpreter as a frontend.

Ns2 basics:

• NS2 use Tcl language for creating simulation scenario file.
• Network topology, transmission time, using protocol etc are defined in scenario file

Steps involved in creating scenario file:

Step0 Declare Simulator and setting output file

Step1 Setting Node and Link

Step2 Setting Agent

Step3 Setting Application

Step4 Setting Simulation time and schedules

Step5 Declare finish

Sample code for ns2:

This is the sample code for creating random traffic in wireless network.

ns cbrgen.tcl [-type cbr tcp] [-nn nodes] [-seed seed] [- mc connections] [-rate rate]

What are the return commands are used in ns2:

#define TCL_OK 0

#define TCL_ERROR 1

#define TCL_RETURN 2

#define TCL_BREAK 3

#define TCL_CONTINUE Download free indian flute music.

TCL_OK: it denoted command completes successfully

TCL_ERROR: it implies does not complete successfully. The interpreter will explain thereasons for the error.

TCL_RETURN: after returning from c++, the interpreter exits the current instproc without performing the rest of instproc.

TCL_BREAK: After returning from C++, the interpreter breaks the current loop. This is similar to executing C++ keyword break, but the results prevail to the OTcl domain

TCL_CONTINUE: After returning from C++, the interpreter continues to the next iteration. This is similar to executing C++ keyword continue, but the results prevail to the OTcl domain.

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4. Why two language? (TCL and C++)

NS2 stands for Network Simulator Version 2. It is an open-source event-driven simulator designed specifically for research in computer communication networks.

NS2 uses OTcl to create and configure a network, and uses C++ to run simulation. All C++ codes need to be compiled and linked to create an executable file.

Use OTcl

• For configuration, setup, or one time simulation, or
• To run simulation with existing NS2 modules.

This option is preferable for most beginners, since it does not involve complicated internal mechanism of NS2. Unfortunately, existing NS2 modules are fairly limited. This option is perhaps not sufficient for most researchers.

Use C++

• When you are dealing with a packet, or - when you need to modify existing NS2 modules.

This option perhaps discourages most of the beginners from using NS2. This book particularly aims at helping the readers understand the structure of NS2 and feel more comfortable in modifying NS2 modules.

5. Installing NS2 on windows 7

NS2 builds and runs under windows using Cygwin. Cygwin provides Linux like environment under windows.

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System Requirements: A computer with C++ compiler. Building full NS2 package requires large memory space approximately 250MB

I. Steps to install NS 2 on windows 7 are given below

1. Download Cygwin from following link https://www.cygwin.com/setup.exe

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2. Run the downloaded setup.exe and you will see screen shown below click next.