Wired Network Coding in ns2 - NS2 Tutorial # 4

This post shows the wired network coding in ns2. It uses 6 nodes ( 0 to 5) and exchange FTP/CBR packets between the nodes.

Please find the coding here. 

Wired Network

Wired Coding in ns2 (with comments and explanation, for detailed explanation see the video at the end)

#please subscribe

#www.youtube.com/tspradeepkumar

#Thank you

#create a simulator object 

set ns [new Simulator]

#create a trace file, this file is for logging purpose 

set tracefile [open wired.tr w]

$ns trace-all $tracefile

#create a animation infomration or NAM file creation

set namfile [open wired.nam w]

$ns namtrace-all $namfile

#create nodes

set n0 [$ns node]

set n1 [$ns node]

set n2 [$ns node]

set n3 [$ns node]

set n4 [$ns node]

set n5 [$ns node]

#creation of link between nodes with DropTail Queue

#Droptail means Dropping the tail.

$ns duplex-link $n0 $n1 5Mb 2ms DropTail

$ns duplex-link $n2 $n1 10Mb 5ms DropTail

$ns duplex-link $n1 $n4 3Mb 10ms DropTail

$ns duplex-link $n4 $n3 100Mb 2ms DropTail

$ns duplex-link $n4 $n5 4Mb 10ms DropTail

#creation of Agents

#node 0 to Node 3

set udp [new Agent/UDP]

set null [new Agent/Null]

$ns attach-agent $n0 $udp

$ns attach-agent $n3 $null

$ns connect $udp $null

#creation of TCP Agent

set tcp [new Agent/TCP]

set sink [new Agent/TCPSink]

$ns attach-agent $n2 $tcp

$ns attach-agent $n5 $sink

$ns connect $tcp $sink

#creation of Application CBR, FTP

#CBR - Constant Bit Rate (Example nmp3 files that have a CBR or 192kbps, 320kbps, etc.)

#FTP - File Transfer Protocol (Ex: To download a file from a network)

set cbr [new Application/Traffic/CBR]

$cbr attach-agent $udp

set ftp [new Application/FTP]

$ftp attach-agent $tcp

#Start the traffic 

$ns at 1.0 "$cbr start"

$ns at 2.0 "$ftp start"

$ns at 10.0 "finish"

#the following procedure will be called at 10.0 seconds 

proc finish {} {

global ns tracefile namfile

$ns flush-trace

close $tracefile

close $namfile

exit 0

}

puts "Simulation is starting..."

$ns run

T S Pradeep Kumar