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Network simulator
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Network simulator is a tool for simulating basic networking aspects.
NS2 requires a different language for scripting.

In this session i will provide you with the basics of Network Simulator installation and scripting.

Also i will provide you with some basic programs and protocol scripts that you would need as a framework for implementing your project’s.

Here is my WebSite for NS2.

Please do visit this site if you need to learn NS2 or if have any queries about NS2.

Here are a few applications where you will need ns2.

focused on modeling network protocols
-> wired, wireless, satellite
-> TCP, UDP, multicast, unicast
-> Web, telnet, ftp
-> Ad hoc routing; sensor networks
-> Infrastructure: stats, tracing, error models etc.
Simulate existing network protocols: TCP,routing, and multicast protocols over both wired and wireless networks.

•Possibility to implement and test new protocols and applications

•Current release: ns-2.5

Here is a sample ns2 code that is used for creating two nodes and link them using a duplex link:

#Create a simulator object
set ns [new Simulator]

#Open the nam trace file
set nf [open out.nam w]
$ns namtrace-all $nf

#Define a ‘finish’ procedure
proc finish {} {
global ns nf
$ns flush-trace
#Close the trace file
close $nf
#Execute nam on the trace file
#exec nam out.nam &
exit 0

#Create two nodes
set n0 [$ns node]
set n1 [$ns node]

#Create a duplex link between the nodes
$ns duplex-link $n0 $n1 1Mb 10ms DropTail

#Call the finish procedure after 5 seconds of simulation time
$ns at 5.0 “finish”

#Run the simulation
$ns run

Coming to NAM :

Nam is a Tcl/TK based animation tool for viewing network simulation traces and real world packet traces. It supports topology layout, packet level animation, and various data inspection tools.

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