#Create a simulator object
set ns [new Simulator]

#Define different colors for data flows (for NAM)
$ns color 1 Blue
$ns color 2 Red

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

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

#Define a 'finish' procedure
proc finish {} {
        global ns nf tf
        $ns flush-trace
        #Close the NAM trace file
        close $nf
        #Close the Trace file
        close $tf
        #Execute NAM on the trace file
        exec nam out.nam & nam.exe 
        exit 0
}

#Create four nodes
set n0 [$ns node]
set n1 [$ns node]
#set n2 [$ns node]
#set n3 [$ns node]
#set n4 [$ns node]

#Create links between the nodes
$ns duplex-link $n0 $n1 2Mb 10ms DropTail
#$ns duplex-link $n1 $n2 2Mb 10ms DropTail
#$ns duplex-link $n2 $n3 1.7Mb 20ms DropTail
#$ns duplex-link $n2 $n4 1.7Mb 20ms DropTail
#$ns duplex-link $n1 $n4 2Mb 10ms DropTail

#Set Queue Size of link (n2-n3) to 10
#$ns queue-limit $n2 $n3 10

#Give node position (for NAM)
$ns duplex-link-op $n0 $n1 orient right-down
#$ns duplex-link-op $n1 $n2 orient right-up
#$ns duplex-link-op $n2 $n3 orient right
#$ns duplex-link-op $n4 $n2 orient right 

#Monitor the queue for link (n2-n3). (for NAM)
#$ns duplex-link-op $n2 $n3 queuePos 0.5


#Setup a TCP connection
set tcp [new Agent/TCP/Reno]
$tcp set class_ 2
$ns attach-agent $n0 $tcp
set sink [new Agent/TCPSink]
$ns attach-agent $n1 $sink
$ns connect $tcp $sink
$tcp set fid_ 1

#Setup a FTP over TCP connection
set ftp [new Application/FTP]
$ftp attach-agent $tcp
$ftp set type_ FTP


#Setup a UDP connection
#set udp [new Agent/UDP]
#$ns attach-agent $n1 $udp
#set null [new Agent/Null]
#$ns attach-agent $n3 $null
#$ns connect $udp $null
#$udp set fid_ 2

#Setup a CBR over UDP connection
#set cbr [new Application/Traffic/CBR]
#$cbr attach-agent $udp
#$cbr set type_ CBR
#$cbr set packet_size_ 1000
#$cbr set rate_ 1mb
#$cbr set random_ false
#$cbr set color "red"



#Schedule events for the CBR and FTP agents
#$ns at 1.0  "$cbr start"
$ns at 1.0 "$ftp start"
$ns at 5 "$ftp stop"
#$ns at 5 "$cbr stop"

#Detach tcp and sink agents (not really necessary)
$ns at 4.5 "$ns detach-agent $n0 $tcp ; $ns detach-agent $n1 $sink"

#Call the finish procedure after 5 seconds of simulation time
$ns at 5.0 "finish"

#Print CBR packet size and interval
#puts "CBR packet size = [$cbr set packet_size_]"
#puts "CBR interval = [$cbr set interval_]"

#Run the simulation
$ns run