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set ns [new Simulator]
#Open the NS trace file
set tracefile [open p1.tr w]
$ns trace-all $tracefile
#Open the NAM trace file
set namfile [open p1.nam w]
$ns namtrace-all $namfile
#===================================
# Nodes Definition
#===================================
#Create 3 nodes
set n0 [$ns node]
set n1 [$ns node]
set n2 [$ns node]
#===================================
# Links Definition
#===================================
#Createlinks between nodes
$ns duplex-link $n0 $n1 100.0Mb 10ms DropTail
$ns queue-limit $n0 $n1 50
$ns duplex-link $n1 $n2 0.1Mb 10ms DropTail
$ns queue-limit $n1 $n2 50
#Give node position (for NAM)
$ns duplex-link-op $n0 $n1 orient right-down
$ns duplex-link-op $n1 $n2 orient left-down
#===================================
# Agents Definition
#===================================
#Setup a UDP connection
set udp0 [new Agent/UDP]
$ns attach-agent $n0 $udp0
set null1 [new Agent/Null]
$ns attach-agent $n2 $null1
$ns connect $udp0 $null1
$udp0 set packetSize_ 1500
#===================================
# Applications Definition
#===================================
#Setup a CBR Application over UDP connection
set cbr0 [new Application/Traffic/CBR]
$cbr0 attach-agent $udp0
$cbr0 set packetSize_ 1000
$cbr0 set rate_ 1.0Mb
$cbr0 set random_ null
$ns at 1.0 "$cbr0 start"
$ns at 2.0 "$cbr0 stop"
#===================================
# Termination
#===================================
#Define a 'finish' procedure
proc finish {} {
global ns tracefile namfile
$ns flush-trace
close $tracefile
close $namfile
exec nam p1.nam &
exit 0
}
#$ns at $val(stop) "$ns nam-end-wireless $val(stop)"
$ns at $val(stop) "finish"
puts "Number of pacekets dropped:"
exec grep -c "^d" p1.tr &
#$ns at $val(stop) "puts "done" ; $ns halt"
$ns run
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