M. S. RAMAIAH INSTITUTE OF TECHNOLOGY(AUTONOMOUS INSTITUTE, AFFILIATED TO

VTU)

A Presentation Report on

“NETWORK SIMULATOR 2”

Submitted in Partial fulfillment of

5th Semester B.EIn

Information Science and EngineeringFor the subject

Data communication

Submitted byNIKITHA.K.N(1MS13IS066)

POOJA.B(1MS13IS074)

RASHMI.K(1MS13IS082)

NIDHI SHETTY(1MS13IS063)

NEHA.M(1MS13IS062)

M. S. RAMAIAH INSTITUTE OF TECHNOLOGYDEPARTMENT OF INFORMATION SCIENCE AND

ENGINEERINGBANGALORE – 560 054

C E R T I F I C A T E

This is to certify that the “Presentation on network simulator 2” has been successfully completed by:

NIKITHA.K.N(1MS13IS066)

POOJA.B(1MS13IS074)

RASHMI.K(1MS13IS082)

NIDHI SHETTY(1MS13IS063)

NEHA.M(1MS13IS062) In partial fulfillment of 5th Semester B.E (Information Science & Engg) for the subject “Data Communication(IS511)” during the period 2015 - 2016, as prescribed by Department of Information Science & Engineering, MSRIT.

SIGNATURE OF STAFF INCHARGEMr. Suresh kumarAssistant professorDept of ISE, MSRIT

ACKNOWLEDGEMENT Any achievement be it scholastic or otherwise does not depend only on the individual efforts but on the guidance ,encouragement and cooperation of elders and friends.

We wish to express our sincere gratitude to MR.SURESH KUMAR, Assistant Professor ,department of ISE, who provided us an opportunity to do “NETWORK SIMULATOR 2” project work at M S Ramaiah institute of technology.

We would like to thank out DR.VIJAY KUMAR B.P , Head of department ,Information Science and engineering, M S R I T, Bangalore for his valuable suggestions and advice.

NIDHI SHETTY(1MS13ISO63)NEHA .M(1MS13IS062)RASHMI.K(1MS13IS082)POOJA.B(1MS13IS074)NIKITHA.K.N(1MS13IS066)

CONTENTS NS2 INTRODUCTION. HISTORY OF NS2. FLATFORMS PREFFERED TO RUN NS2. CRITICISM. ADVANTAGES. TCL PROGRAMMING. NS2 COMPONENTS. NAM. NS2 GOALS. DRAWBACKS.

NS2 INTRODUCTION

WHAT IS NS2?

Discrete event simulator. Packet level Mainly for networking research. The object oriented extension of TCL(OTCL) and C++

used. Designing for unix systems bt runs under windows Cygwin

as well.

HISTORY OF NS2:

1995 : Developed by LBL through support of DARPA

1996: NS was extended and distributed by VINT project

1997: Satellite models added @ UCB 1999: Wireless models added @ CMU

PLATFORMS SUPPORTED FOR NS2:

• Most UNIX and UNIX-like systems FreeBSD Linux Solaris

• Windows 98/2000/2003/XP Cygwin required Some work , some doesnt

C++ : It increases the efficiency of simulation. It is used to provide the details of the protocols and their

operation. It is used to reduce packet and event processing time.

ADVATAGES:

• sometimes cheaper• find bugs (in design) in advance• generality: over analytic/numerical techniques• detail: can simulate system details at arbitrary level.

OTCL: Simulation of slightly varying parameters or configurations quickly exploring a number of scenarios

iteration time (change the model and re-run) is more important

it allows fast development.

NS2 COMPONENTS:• NS – Simulator• NAM – Network AniMator

– visual demonstration of NS output• Preprocessing

– Handwritten TCL or– Topology generator

• Post analysis– Trace analysis using Perl/TCL/AWK/MATLAB

NAM: NAM-Network animator toolThe NAM is a completely separate program that is distributed with

the NS simulator.This program is named NAM and is shows the progression of the

packets through the network.The NAM program reads an input file(containing the packets

transmission events and draw the network event graphically.Running NAM-unix>>nam nam.input

NS2 GOALS: To support networking research and education.

– Protocol design, traffic studies, etc and the Protocol comparison;– New architecture designs are also supported.

To provide collaborative environment– Freely distributed, open source and to increase confidence in result.

NS2 DRAWBACKS: caution: does model reflect reality large scale systems: lots of resources to simulate

(especially accurately simulate) may be slow (computationally expensive – 1 min real

time could be hours of simulated time) art: determining right level of model complexity statistical uncertainty in results

Simulate a three nodes point-to-point network with duplex links between them. Set the queue size vary the bandwidth and find the number of packets dropped.

#Create simulator set ns [new Simulator]

#Open the nam trace file

set nf [open ex1.nam w]

$ns namtrace-all

$nf set nt [open ex1.tr w]

$ns trace-all $nt

proc finish {} {

global ns nf nt

$ns flush-trace

#Close the trace file

close $nf close $nt

#Execute nam on the trace file

exec nam ex1.nam &

exit 0 }

#create node

set n0 [$ns node]

set n1 [$ns node]

set n2 [$ns node]

#create link $ns duplex-link $n0 $n1 12Mb 10ms DropTail

$ns duplex-link $n1 $n2 0.2Mb 10ms DropTail

#Set Queue Size

$ns queue-limit $n0 $n1 10

$ns queue-limit $n1 $n2 10

#setup udp connection

set udp0 [new Agent/UDP]

$ns attach-agent $n0 $udp0

#set sink to node

set null0 [new Agent/Null]

$ns attach-agent $n2 $null0

#connect udp src and sink

$ns connect $udp0 $null0

# set udp traffic

set cbr [new Application/Traffic/CBR]

$cbr attach-agent $udp0

$cbr set type_ CBR

$cbr set packetSize_ 1000

$cbr set rate_ 0.5Mb

$cbr set random_ false

$ns at 0.0 "$cbr start"

$ns at 5.0 "finish"

$ns run

TO CALCULATE NUMBER OF PACKETS DROPPED:

BEGIN { pktdrp = 0; }

{

event = $1;

if(event == "d")

{ pktdrp++; }

}

END { printf("The number of packets dropped is %d\n",pktdrp);

BIBLIOGRAPHY

http://www.Googleweblight.comhttp://www.isi.eduhttp://wikipedia.com

Data communication and networking-behrouz A forouzanComputer networks - renukambigar.Computer networks - tannanbaum