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2
set ns [new Simulator] 

set tf [open lab2.tr w]

$ns trace-all $tf
set nf [open lab2.nam w]
$ns namtrace-all $nf
set n0 [$ns node] 
set n1 [$ns node] 
set n2 [$ns node] 
set n3 [$ns node] 
set n4 [$ns node] 
set n5 [$ns node] 
set n6 [$ns node]
$n0 label "Ping0"
$n4 label "Ping4"
$n5 label "Ping5"
$n6 label "Ping6"
$n2 label "Router"
$ns color 1 "red"
$ns color 2 "green"
$ns duplex-link $n0 $n2 100Mb 300ms DropTail
$ns duplex-link $n1 $n2 1Mb 300ms DropTail
$ns duplex-link $n3 $n2 1Mb 300ms DropTail
$ns duplex-link $n5 $n2 100Mb 300ms DropTail
$ns duplex-link $n2 $n4 1Mb 300ms DropTail
$ns duplex-link $n2 $n6 1Mb 300ms DropTail
$ns queue-limit $n0 $n2 5
$ns queue-limit $n2 $n4 3
$ns queue-limit $n2 $n6 2
$ns queue-limit $n5 $n2 5
set ping0 [new Agent/Ping]

$ns attach-agent $n0 $ping0

set ping4 [new Agent/Ping]
$ns attach-agent $n4 $ping4
set ping5 [new Agent/Ping]
$ns attach-agent $n5 $ping5
set ping6 [new Agent/Ping]
$ns attach-agent $n6 $ping6
$ping0 set packetSize_ 50000
$ping0 set interval_ 0.0001
$ping5 set packetSize_ 60000
$ping5 set interval_ 0.00001
$ping0 set class_ 1
$ping5 set class_ 2
$ns connect $ping0 $ping4
$ns connect $ping5 $ping6
#Define a 'recv' function for the class 'Agent/Ping'
#The below function is executed when the ping agent receives a reply from the #destination
Agent/Ping instproc recv {from rtt} {
$self instvar node_
puts " The node [$node_ id] received an reply from $from with round trip time of $rtt"
}
proc finish {} { 
global ns nf tf 
exec nam lab4.nam &
exec echo "The total number of packet dropped due to congestion is:" &
exec grep -c "^d" lab4.tr &
$ns flush-trace
close $nf
close $tf
exit 0
}
$ns at 0.1 "$ping0 send"

$ns at 0.2 "$ping0 send"

$ns at 0.3 "$ping0 send"
$ns at 0.4 "$ping0 send"
$ns at 0.5 "$ping0 send"
$ns at 0.6 "$ping0 send"
$ns at 0.7 "$ping0 send"
$ns at 0.8 "$ping0 send"
$ns at 0.9 "$ping0 send"
$ns at 1.0 "$ping0 send"
$ns at 1.1 "$ping0 send"
$ns at 1.2 "$ping0 send"
$ns at 1.3 "$ping0 send"
$ns at 1.4 "$ping0 send"
$ns at 1.5 "$ping0 send"
$ns at 1.6 "$ping0 send"
$ns at 1.7 "$ping0 send"
$ns at 1.8 "$ping0 send"
$ns at 0.1 "$ping5 send"
$ns at 0.2 "$ping5 send"
$ns at 0.3 "$ping5 send"
$ns at 0.4 "$ping5 send"
$ns at 0.5 "$ping5 send"
$ns at 0.6 "$ping5 send"
$ns at 0.7 "$ping5 send"
$ns at 0.8 "$ping5 send"
$ns at 0.9 "$ping5 send"
$ns at 1.0 "$ping5 send"
$ns at 1.1 "$ping5 send"
$ns at 1.2 "$ping5 send"
$ns at 1.3 "$ping5 send"
$ns at 1.4 "$ping5 send"
$ns at 1.5 "$ping5 send"
$ns at 1.6 "$ping5 send"
$ns at 1.7 "$ping5 send"
$ns at 1.8 "$ping5 send"
$ns at 5.0 "finish"
$ns run


3
#set ns Simulator

set ns [new Simulator]

#define color for data flow
$ns color 1 Blue
$ns color 2 Red
#open trace file
set tracefile1 [open lab6.tr w]
set winfile [open winfile w]
$ns trace-all $tracefile1
#open namtrace file
set namfile [open lab6.nam w]
$ns namtrace-all $namfile
#define finish procedure
proc finish { } {
global ns tracefile1 namfile
$ns flush-trace
close $tracefile1
close $namfile
exec nam lab6.nam &
exit 0
}
#create 6 nodes
set n0 [$ns node]
set n1 [$ns node]
set n2 [$ns node]
set n3 [$ns node]
set n4 [$ns node]
set n5 [$ns node]
$n1 shape box
#create link between nodes
$ns duplex-link $n0 $n2 2Mb 10ms DropTail
$ns duplex-link $n1 $n2 2Mb 10ms DropTail
$ns simplex-link $n2 $n3 0.3Mb 100ms DropTail
$ns simplex-link $n3 $n2 0.3Mb 100ms DropTail
set lan [$ns newLan "$n3 $n4 $n5" 0.5Mb 40ms LL Queue/DropTail MAC/802_3]

#give node position

$ns duplex-link-op $n0 $n2 orient right-down
$ns duplex-link-op $n1 $n2 orient right-up
$ns simplex-link-op $n3 $n2 orient left
$ns simplex-link-op $n2 $n3 orient right
#set queue size of link(n2-n3)
$ns queue-limit $n2 $n3 20
#setup tcp connection
set tcp [new Agent/TCP]
$ns attach-agent $n0 $tcp
set sink [new Agent/TCPSink]
$ns attach-agent $n4 $sink
$ns connect $tcp $sink
$tcp set fid_ 1
$tcp set packetSize_ 552
#set ftp over tcp connection
set ftp [new Application/FTP]
$ftp attach-agent $tcp
#setup a TCP1 connection
set tcp1 [new Agent/TCP]
$ns attach-agent $n1 $tcp1
set sink1 [new Agent/TCPSink]
$ns attach-agent $n5 $sink1
$ns connect $tcp1 $sink1
$tcp1 set fid_ 2
$tcp1 set packetSize_ 552
set telnet0 [new Application/Telnet]
$telnet0 attach-agent $tcp1
#title congestion window1
set outfile1 [open congestion1.xg w]
puts $outfile1 "TitleText: Congestion Window-- Source _tcp"
puts $outfile1 "xUnitText: Simulation Time(Secs)"
puts $outfile1 "yUnitText: Congestion WindowSize"
#title congestion window2

set outfile2 [open congestion2.xg w]

puts $outfile2 "TitleText: Congestion Window-- Source _tcp1"
puts $outfile2 "xUnitText: Simulation Time(Secs)"
puts $outfile2 "yUnitText: Congestion WindowSize"
proc plotWindow {tcpSource outfile} {
global ns
set time 0.1
set now [$ns now]
set cwnd [$tcpSource set cwnd_]
puts $outfile "$now $cwnd"
$ns at [expr $now+$time] "plotWindow $tcpSource $outfile"
}
$ns at 0.1 "plotWindow $tcp $winfile"
$ns at 0.0 "plotWindow $tcp $outfile1"
$ns at 0.1 "plotWindow $tcp1 $outfile2"
$ns at 0.3 "$ftp start"
$ns at 0.5 "$telnet0 start"
$ns at 49.0 "$ftp stop"
$ns at 49.1 "$telnet0 stop"
$ns at 50.0 "finish"
$ns run