set ns [new Simulator]
set nf [open out.nam w]
$ns namtrace-all $nf
proc fim {} {
	global ns nf
	$ns flush-trace
	close $nf
	exec nam out.nam
	exit 0
}
set n0 [$ns node]
set n1 [$ns node]
$ns duplex-link $n0 $n1 20Kb 1.45ms DropTail
#Cria um agente UDP e liga-o ao nó n0
set udp0 [new Agent/UDP]
$ns attach-agent $n0 $udp0
#Cria uma fonte de tráfego CBR e liga-a ao udp0
set cbr0 [new Application/Traffic/CBR]
$cbr0 set packetSize_ 1024
$cbr0 set interval_ 1
$cbr0 set maxpkts_ 1
$cbr0 attach-agent $udp0
#Cria um agente Null e liga-o ao nó n1
set null0 [new Agent/Null]
$ns attach-agent $n1 $null0
$ns connect $udp0 $null0

$ns at 0.1 "$cbr0 start"
$ns at 0.6 "$cbr0 stop"

$ns at 5.0 "fim"
$ns run