English
- # Sliding window protocol in a heavily loaded network.
- # features : labeling, annotation, nam-graph, and window size monitoring
- # all packets look black cause of supporting nam-graph
- # you could run 'C2-sliding-color.nam' to see the colors of each traffic
- #
- # n0 n5
- # /
- # n1 -- n3 ---------- n4 -- n6
- # /
- # n2 n7
- set ns [new Simulator]
- $ns color 0 black
- $ns color 1 red
- #$ns trace-all [open C2-sliding-window.tr w]
- #$ns namtrace-all [open C2-sliding-window.nam w]
- foreach i " 0 1 2 3 4 5 6 7" {
- set n$i [$ns node]
- }
- $ns at 0.0 "$n0 label TCP"
- $ns at 0.0 "$n5 label TCP"
- $ns at 0.0 "$n1 label CBR-1"
- $ns at 0.0 "$n2 label CBR-2"
- $ns at 0.0 "$n6 label CBR-1"
- $ns at 0.0 "$n7 label CBR-2"
- $ns duplex-link $n0 $n3 5Mb 20ms DropTail
- $ns duplex-link $n1 $n3 1Mb 20ms DropTail
- $ns duplex-link $n2 $n3 1Mb 20ms DropTail
- $ns duplex-link $n3 $n4 1Mb 50ms DropTail
- $ns duplex-link $n4 $n5 5Mb 20ms DropTail
- $ns duplex-link $n4 $n6 1Mb 20ms DropTail
- $ns duplex-link $n4 $n7 1Mb 20ms DropTail
- $ns queue-limit $n3 $n4 10
- $ns duplex-link-op $n0 $n3 orient right-down
- $ns duplex-link-op $n1 $n3 orient right
- $ns duplex-link-op $n2 $n3 orient right-up
- $ns duplex-link-op $n3 $n4 orient right
- $ns duplex-link-op $n4 $n5 orient right-up
- $ns duplex-link-op $n4 $n6 orient right
- $ns duplex-link-op $n4 $n7 orient right-down
- $ns duplex-link-op $n3 $n4 queuePos 0.5
- Agent/TCP set nam_tracevar_ true
- Agent/TCP set maxcwnd_ 8
- ### TCP between n0 and n5 (Black)
- #set sliding [new Agent/TCP/SlidingWindow]
- set sliding [new Agent/TCP]
- $sliding set fid_ 0
- $ns attach-agent $n0 $sliding
- #set sink [new Agent/TCPSink/SlidingWindowSink]
- set sink [new Agent/TCPSink]
- $ns attach-agent $n5 $sink
- $ns connect $sliding $sink
- set ftp [new Application/FTP]
- $ftp attach-agent $sliding
- $ns add-agent-trace $sliding tcp
- $ns monitor-agent-trace $sliding
- $sliding tracevar cwnd_
- ### CBR traffic between (n1 & n6) and (n2 & n7)
- set cbr0 [new Agent/CBR]
- $ns attach-agent $n1 $cbr0
- $cbr0 set fid_ 1
- $cbr0 set packetSize_ 500
- $cbr0 set interval_ 0.01
- set null0 [new Agent/CBR]
- $ns attach-agent $n6 $null0
- $ns connect $cbr0 $null0
- set cbr1 [new Agent/CBR]
- $ns attach-agent $n2 $cbr1
- $cbr1 set fid_ 1
- $cbr1 set packetSize_ 1000
- $cbr1 set interval_ 0.01
- set null1 [new Agent/CBR]
- $ns attach-agent $n7 $null1
- $ns connect $cbr1 $null1
- proc finish {} {
- global ns
- $ns flush-trace
- # puts "filtering..."
- # exec tclsh ../bin/namfilter.tcl C2-sliding-window.nam
- puts "running nam..."
- exec nam C2-sliding-window.nam &
- exit 0
- }
- ### set operations
- $ns at 0.05 "$cbr0 start"
- $ns at 2.3 "$cbr0 stop"
- $ns at 0.1 "$cbr1 start"
- $ns at 2.5 "$cbr1 stop"
- $ns at 0.5 "$ftp start"
- $ns at 2.5 "$ftp stop"
- $ns at 2.7 "finish"
- $ns at 0.50 "$cbr1 set interval_ 0.02"
- $ns at 1.50 "$cbr0 set interval_ 0.02"
- $ns at 1.70 "$cbr1 set interval_ 0.01"
- $ns at 1.70 "$cbr1 set interval_ 0.01"
- ### add annotations
- $ns at 0.0 "$ns trace-annotate "Sliding Window (window size=8) in a heavely loaded network""
- $ns at 0.05 "$ns trace-annotate "CBR-1 starts""
- $ns at 0.1 "$ns trace-annotate "CBR-2 starts""
- $ns at 0.48 "$ns trace-annotate "Sliding-Window Traffic starts""
- $ns at 0.51 "$ns trace-annotate "Send Packet_0 to 7 ""
- $ns at 0.54 "$ns trace-annotate "Lost Packet (5 of them) ""
- $ns at 0.66 "$ns trace-annotate "3 Ack_0s""
- $ns at 0.75 "$ns trace-annotate "Send Packet_8""
- $ns at 0.85 "$ns trace-annotate "Ack_0""
- $ns at 0.95 "$ns trace-annotate "Send Packet_1 to 8""
- $ns at 1.04 "$ns trace-annotate "Ack_1 to 8""
- $ns at 1.14 "$ns trace-annotate "Send Packet_9 to 16""
- $ns at 1.22 "$ns trace-annotate "Lost Packet (2 of them) ""
- $ns at 1.27 "$ns trace-annotate "Ack_7 to 14 ""
- $ns at 1.35 "$ns trace-annotate "Send Packet_17 to 22""
- $ns at 1.49 "$ns trace-annotate "6 Ack_14s ""
- $ns at 1.58 "$ns trace-annotate "Send Packet_15 to 22""
- $ns at 1.70 "$ns trace-annotate "Ack_15 to 22 ""
- $ns at 1.78 "$ns trace-annotate "Send Packet_23 to 30""
- $ns at 1.85 "$ns trace-annotate "Lost Packet (2 of them) ""
- $ns at 1.90 "$ns trace-annotate "Ack_23 to 27 ""
- $ns at 2.00 "$ns trace-annotate "Send Packet_31 to 35""
- $ns at 2.08 "$ns trace-annotate "Lost Packet (all of them) ""
- $ns at 2.55 "$ns trace-annotate "FTP stops""
- $ns run
