Description:
This network consists of 8 nodes (Client1, Client2, Client3, Client4, Router1, Router2 Router3, Router4, Router5, Router6 and Endserver1). The duplex links between Client1, Client2, Client3, Client4 and Router1 have 5 Mbps of bandwidth and 50 ms of delay. The duplex link between routers and Endserver are configured with specific bandwidth and delay. Each link uses a DropTail queue. A "TCP" agent is attached to Client1, Client2, Client3, Client4 and a connection is established to a "TCPSink" agent attached to Endserver1. As default, the maximum size of a packet that a "TCP" agent can generate is 1000bytes. A "TCPSink" agent generates and sends ACK packets to the sender (tcp agent) and frees the received packets. The packet dropped down between the Router3 and Router4 at 2.88 and again it dropped down between the Router4 and Router5 at 7.28 sec. The ftp is set to start at 0.60 sec and stop at 28.5 sec.
File name: “drop3.tcl”
#-------Event scheduler object creation--------#
set ns [ new Simulator]
# ----------- CREATING NAM OBJECTS -----------------#
set nf [open drop3.nam w]
$ns namtrace-all $nf
#Open the trace file
set nt [open drop3.tr w]
$ns trace-all $nt
set proto rlm
#------------COLOR DESCRIPTION---------------#
$ns color 1 red
$ns color 2 blue
$ns color 3 yellow
$ns color 4 cyan
$ns color 5 maroon
# --------- CREATING CLIENT - ROUTER -ENDSERVER NODES-----------#
set Client1 [$ns node]
set Client2 [$ns node]
set Client3 [$ns node]
set Client4 [$ns node]
set Router1 [$ns node]
set Router2 [$ns node]
set Router3 [$ns node]
set Router4 [$ns node]
set Router5 [$ns node]
set Router6 [$ns node]
set Endserver1 [$ns node]
#set Endserver2 [$ns node]
# --------------CREATING DUPLEX LINK -----------------------#
$ns duplex-link $Client1 $Router1 5Mb 50ms DropTail
$ns duplex-link $Client2 $Router1 5Mb 50ms DropTail
$ns duplex-link $Client3 $Router1 5Mb 50ms DropTail
$ns duplex-link $Client4 $Router1 5Mb 50ms DropTail
$ns duplex-link $Router1 $Router2 5Mb 50ms DropTail
$ns duplex-link $Router2 $Router3 150Kb 50ms DropTail
$ns duplex-link $Router3 $Router4 300Kb 50ms DropTail
$ns duplex-link $Router4 $Router5 100Kb 50ms DropTail
$ns duplex-link $Router5 $Router6 300Kb 50ms DropTail
$ns duplex-link $Router6 $Endserver1 300Kb 50ms DropTail
#$ns duplex-link $Router6 $Endserver2 300Kb 50ms DropTail
#-----------CREATING ORIENTATION -------------------#
$ns duplex-link-op $Client1 $Router1 orient down-right
$ns duplex-link-op $Client2 $Router1 orient right
$ns duplex-link-op $Client3 $Router1 orient up-right
$ns duplex-link-op $Client4 $Router1 orient up
$ns duplex-link-op $Router1 $Router2 orient right
$ns duplex-link-op $Router2 $Router3 orient down
$ns duplex-link-op $Router3 $Router4 orient right
$ns duplex-link-op $Router4 $Router5 orient up
$ns duplex-link-op $Router5 $Router6 orient right
$ns duplex-link-op $Router6 $Endserver1 orient up-right
#$ns duplex-link-op $Router6 $Endserver2 orient right
# --------------LABELLING ---------------------#
$ns at 0.0 "$Client1 label Client1"
$ns at 0.0 "$Client2 label Client2"
$ns at 0.0 "$Client3 label Client3"
$ns at 0.0 "$Client4 label Client4"
$ns at 0.0 "$Router1 label Router1"
$ns at 0.0 "$Router2 label Router2"
$ns at 0.0 "$Router3 label Router3"
$ns at 0.0 "$Router4 label Router4"
$ns at 0.0 "$Router5 label Router5"
$ns at 0.0 "$Router6 label Router6"
$ns at 0.0 "$Endserver1 label Endserver"
#$ns at 0.0 "$Endserver2 label Endserver2"
# --------------- CONFIGURING NODES -----------------#
$Endserver1 shape hexagon
$Router1 shape box
$Router2 shape square
$Router3 shape square
$Router4 shape square
$Router5 shape square
$Router6 shape square
# ----------------ESTABLISHING QUEUES -------------#
$ns duplex-link-op $Client1 $Router1 queuePos 0.1
$ns duplex-link-op $Client2 $Router1 queuePos 0.1
$ns duplex-link-op $Client3 $Router1 queuePos 0.5
$ns duplex-link-op $Client4 $Router1 queuePos 0.5
$ns duplex-link-op $Router1 $Router2 queuePos 0.1
$ns duplex-link-op $Router2 $Router3 queuePos 0.1
$ns duplex-link-op $Router3 $Router4 queuePos 0.1
$ns duplex-link-op $Router4 $Router5 queuePos 0.1
$ns duplex-link-op $Router5 $Router6 queuePos 0.5
$ns duplex-link-op $Router6 $Endserver1 queuePos 0.5
# ----------------ESTABLISHING COMMUNICATION -------------#
#----------- CLIENT1 TO ENDSERVER -------------#
set tcp0 [new Agent/TCP]
$tcp0 set maxcwnd_ 16
$tcp0 set fid_ 4
$ns attach-agent $Client1 $tcp0
set sink0 [new Agent/TCPSink]
$ns attach-agent $Endserver1 $sink0
$ns connect $tcp0 $sink0
set ftp0 [new Application/FTP]
$ftp0 attach-agent $tcp0
$ns add-agent-trace $tcp0 tcp
$tcp0 tracevar cwnd_
$ns at 0.5 "$ftp0 start"
$ns at 28.5 "$ftp0 stop"
# ---------------- CLIENT2 TO ENDSERVER -------------#
set tcp1 [new Agent/TCP]
$tcp1 set fid_ 2
$tcp1 set maxcwnd_ 16
$ns attach-agent $Client2 $tcp1
set sink1 [new Agent/TCPSink]
$ns attach-agent $Endserver1 $sink1
$ns connect $tcp1 $sink1
set ftp1 [new Application/FTP]
$ftp1 attach-agent $tcp1
$ns add-agent-trace $tcp1 tcp1
$tcp1 tracevar cwnd_
$ns at 0.58 "$ftp1 start"
$ns at 28.5 "$ftp1 stop"
# ---------------- CLIENT3 TO ENDSERVER -------------#
set tcp2 [new Agent/TCP]
$tcp2 set fid_ 0
$tcp2 set maxcwnd_ 16
$tcp2 set packetsize_ 100
$ns attach-agent $Client3 $tcp2
set sink2 [new Agent/TCPSink]
$ns attach-agent $Endserver1 $sink2
$ns connect $tcp2 $sink2
set ftp2 [new Application/FTP]
$ftp2 attach-agent $tcp2
$ns add-agent-trace $tcp2 tcp2
$tcp2 tracevar cwnd_
$ns at 0.65 "$ftp2 start"
$ns at 28.5 "$ftp2 stop"
#--------------------CLIENT4 TO ENDSERVER----------------#
set tcp3 [new Agent/TCP]
$tcp3 set fid_ 3
$tcp3 set maxcwnd_ 16
$tcp2 set packetsize_ 100
$ns attach-agent $Client4 $tcp3
set sink3 [new Agent/TCPSink]
$ns attach-agent $Endserver1 $sink3
$ns connect $tcp3 $sink3
set ftp3 [new Application/FTP]
$ftp3 attach-agent $tcp3
$ns add-agent-trace $tcp3 tcp3
$tcp3 tracevar cwnd_
$ns at 0.60 "$ftp3 start"
$ns at 28.5 "$ftp3 stop"
#--------------Creating drops-------------#
$ns rtmodel-at 2.880511 down $Router3 $Router4
$ns rtmodel-at 2.880511 up $Router3 $Router4
$ns rtmodel-at 7.299242 down $Router5 $Router6
$ns rtmodel-at 7.299242 up $Router5 $Router6
# ---------------- FINISH PROCEDURE -------------#
proc finish {} {
global ns nf nt
$ns flush-trace
close $nf
puts "running nam..."
exec nam drop3.nam &
exit 0
}
#Calling finish procedure
$ns at 15.0 "finish"
$ns run
#-----How to run-----#
$ns drop3.tcl
#----------Snapshot-----------#
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