This post shows the wired network coding in ns2. It uses 6 nodes ( 0 to 5) and exchange FTP/CBR packets between the nodes.
T S Pradeep Kumar
Please find the coding here.
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| 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
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