Program 4

4. Implement simple ESS and with transmitting nodes in wire-less LAN by simulation and determine the performance with respect to transmission of packets.

set ns [new Simulator]
set tf [open "lab4.tr" w]
$ns trace-all $tf
set topo [new Topography]
$topo load_flatgrid 1000 1000
set nf [open "lab4.nam" w]
$ns namtrace-all-wireless $nf 1000 1000
$ns node-config -adhocRouting DSDV \
 -llType LL \
 -macType Mac/802_11 \
 -ifqType Queue/DropTail \
 -ifqLen 50 \
 -phyType Phy/WirelessPhy \
 -channelType Channel/WirelessChannel \
 -propType Propagation/TwoRayGround \
 -antType Antenna/OmniAntenna \
 -topoInstance $topo \
 -agentTrace ON \
 -routerTrace ON \
create-god 3
set n0 [$ns node]
set n1 [$ns node]
set n2 [$ns node]
$n0 label "tcp0"
$n1 label "sink1/tcp1"
$n2 label "sink2"
$n0 set X_ 50
$n0 set Y_ 50
$n0 set Z_ 0
$n1 set X_ 100
$n1 set Y_ 100
$n1 set Z_ 0
$n2 set X_ 600
$n2 set Y_ 600
$n2 set Z_ 0
$ns at 0.1 "$n0 setdest 50 50 0"
$ns at 0.1 "$n1 setdest 100 100 0"
$ns at 0.1 "$n2 setdest 600 600 0"
set tcp0 [new Agent/TCP]
$ns attach-agent $n0 $tcp0
set ftp0 [new Application/FTP]
$ftp0 attach-agent $tcp0
set sink1 [new Agent/TCPSink]
$ns attach-agent $n1 $sink1
$ns connect $tcp0 $sink1
set tcp1 [new Agent/TCP]
$ns attach-agent $n1 $tcp1
set ftp1 [new Application/FTP]
$ftp1 attach-agent $tcp1
set sink2 [new Agent/TCPSink]
$ns attach-agent $n2 $sink2
$ns connect $tcp1 $sink2
$ns at 5 "$ftp0 start"
$ns at 5 "$ftp1 start"
$ns at 100 "$n1 setdest 550 550 15"
$ns at 190 "$n1 setdest 70 70 15"
proc finish { } {
global ns nf tf
$ns flush-trace
exec nam lab4.nam &
close $tf
close $nf
exit 0
}
$ns at 250 "finish"
$ns run

AWK file (Open a new editor using “gedit command” and write awk file and save with “.awk” extension)

BEGIN{
count1=0
count2=0
pack1=0
pack2=0
time1=0
time2=0
}
{
if($1=="r" && $3=="_1_" && $4=="AGT")
{
 count2++
 pack1=pack1+$8
 time1=$2
}
if($1=="r" && $3=="_2_" && $4=="AGT")
{
 count2++
 pack2=pack2+$8
 time2=$2
}
}
END
printf("Throughput from no to n1: %f Mbps \n",((count1*pack1*8)/time1*1000000)));
printf("Throughput from n1 to n2: %f Mbps \n",((count2*pack2*8)/time2*1000000)));
}