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Network Simulation Script Setup

The document defines a network simulator with 6 nodes and various links between them. It creates TCP and UDP agents, attaches them to nodes, and establishes connections between them. It also defines applications like FTP and CBR traffic to flow over the connections. The simulator is run for 5 seconds, with the applications started and stopped at certain times, and the results written to a nam trace file.

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Beulah Sam
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43 views2 pages

Network Simulation Script Setup

The document defines a network simulator with 6 nodes and various links between them. It creates TCP and UDP agents, attaches them to nodes, and establishes connections between them. It also defines applications like FTP and CBR traffic to flow over the connections. The simulator is run for 5 seconds, with the applications started and stopped at certain times, and the results written to a nam trace file.

Uploaded by

Beulah Sam
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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#Create a simulator object

set ns[new Simulator]

#Open the nam trace file


set nf [open out.nam w]
$ns namtrace-all $nf

$ns color 1 Blue


$ns color 2 Red

#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
}

# Creating 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]

#Setting Links
$ns duplex-link $n0 $n2 2Mb 10ms DropTail
$ns duplex-link $n1 $n2 2Mb 10ms DropTail
$ns duplex-link $n2 $n3 0.3Mb 100ms DropTail
$ns duplex-link $n3 $n2 0.3Mb 100ms DropTail
$ns duplex-link $n3 $n4 0.5Mb 40ms DropTail
$ns duplex-link $n3 $n5 0.5Mb 40ms DropTail

#Setting Topology
$ns duplex-link-op $n0 $n2 orient right-down
$ns duplex-link-op $n1 $n2 orient right-up
$ns duplex-link-op $n2 $n3 orient left-up
$ns duplex-link-op $n3 $n2 orient left
$ns duplex-link-op $n3 $n4 orient up
$ns duplex-link-op $n3 $n5 orient right-up

#Setting Queue Limit


$ns queue-limit $n2 $n3 10
#Setup a TCP connection over 0 and 4 and its flow id, window size, packet size
set tcp [new Agent/TCP/Newreno]
$ns attach-agent $n0 $tcp
set sink [new Agent/TCPSink/DelAck]
$ns attach-agent $n4 $sink
$ns connect $tcp $sink
$tcp set fid_ 1
$tcp set window_ 8000
$tcp set packetSize_ 552

#Setup a FTP over TCP connection


set ftp [new Application/FTP]
$ftp attach-agent $tcp
$ftp set type_ FTP

#Create a UDP agent and attach it to node n0


set udp [new Agent/UDP]
$ns attach-agent $n0 $udp

# Create a CBR traffic source and attach it to udp0


set cbr [new Application/Traffic/CBR]
$cbr set type_ CBR
$cbr set packet_size_ 1000
$cbr set rate_ 0.01mb
$cbr set random_ false
$cbr attach-agent $udp

#Create a Null agent (a traffic sink) and attach it to node n1


set null [new Agent/Null]
$ns attach-agent $n5 $null

#Connect the traffic source with the traffic sink


$ns connect $udp $null

#Set Flow ID, Packet Size and Window Size


$udp set fid_ 2
$udp set window_ 8000
$udp set packetSize_ 552

#Start and stop the cbr and ftp


$ns at 0.1 "$cbr start"
$ns at 1.0 "$ftp start"
$ns at 4.5 "$ftp stop"
$ns at 5.0 "$cbr stop"

#Call the finish procedure after 5 seconds of simulation time


$ns at 5.0 "finish"

#Run the simulation


$ns run

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