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# This script is created by NSG2 beta1
# <http://wushoupong.googlepages.com/nsg>

#===================================
#     Simulation parameters setup
#===================================
set val(stop)   10.0                         ;# time of simulation end

#===================================
#        Initialization        
#===================================
#Create a ns simulator
set ns [new Simulator]

#Open the NS trace file
set tracefile [open out.tr w]
$ns trace-all $tracefile

#Open the NAM trace file
set namfile [open out.nam w]
$ns namtrace-all $namfile

#===================================
#        Nodes Definition        
#===================================
#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]
$n0 label "ping0"
$n1 label "ping1"
$n2 label "R1"
$n3 label "R2"
$n4 label "ping4"
$n5 label "ping5"
$ns color 1 red
$ns color 2 blue
$ns color 3 green
$ns color 4 orange

#===================================
#        Links Definition        
#===================================
#Createlinks between nodes
$ns duplex-link $n0 $n2 1Mb 10ms DropTail

$ns duplex-link $n1 $n2 0.4Mb 10ms DropTail

$ns duplex-link $n2 $n3 4Kb 10ms DropTail

$ns duplex-link $n3 $n4 1Mb 10ms DropTail

$ns duplex-link $n3 $n5 1Mb 10ms DropTail


#Give node position (for NAM)
$ns duplex-link-op $n0 $n2 orient right-down
$ns duplex-link-op $n1 $n2 orient right-up
$ns duplex-link-op $n2 $n3 orient right
$ns duplex-link-op $n3 $n4 orient right-up
$ns duplex-link-op $n3 $n5 orient right-down
#add manually
set ping0 [new Agent/Ping]
$ns attach-agent $n0 $ping0

set ping1 [new Agent/Ping]
$ns attach-agent $n1 $ping1

set ping4 [new Agent/Ping]
$ns attach-agent $n4 $ping4

set ping5 [new Agent/Ping]
$ns attach-agent $n5 $ping5

$ns connect $ping0 $ping4
$ns connect $ping1 $ping5
proc sendPingPacket {} {
        global ns ping0 ping1
        set intervalTime 0.001
        set now [$ns now]
        $ns at [expr $now + $intervalTime] "$ping0 send"
        $ns at [expr $now + $intervalTime] "$ping1 send"
        $ns at [expr $now + $intervalTime] "sendPingPacket"
}
#rtt=round trip time(packet travel from src to dest and back to src)
Agent/Ping instproc recv {from rtt} {
        global seq
        $self instvar node_
        puts "The node [$node_ id] received an ACK from the node $from with RTT $rtt ms"
}
$ping0 set class_ 1
$ping1 set class_ 2
$ping4 set class_ 3
$ping5 set class_ 4
#end
#===================================
#        Termination        
#===================================
#Define a 'finish' procedure
proc finish {} {
    global ns tracefile namfile
    $ns flush-trace
    close $tracefile
    close $namfile
    exec nam out.nam &
    exit 0
}
#add manually
$ns at 0.01 "sendPingPacket"
$ns at 10.0 "finish"
$ns run 
#end