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

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#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