/usr/share/doc/nam/examples/edu/B5-slow-start.tcl is in nam-examples 1.15-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 | # slow start protocol in normal situation
# features : labeling, annotation, nam-graph, and window size monitoring
set ns [new Simulator]
$ns color 1 Red
$ns trace-all [open B5-slow-start.tr w]
$ns namtrace-all [open B5-slow-start.nam w]
### build topology with 6 nodes
proc build_topology { ns } {
global node_
set node_(ss1) [$ns node]
set node_(ss2) [$ns node]
set node_(rr1) [$ns node]
set node_(rr2) [$ns node]
set node_(ss3) [$ns node]
set node_(ss4) [$ns node]
$node_(ss2) color "red"
$node_(ss4) color "red"
$node_(rr1) color "blue"
$node_(rr2) color "blue"
$node_(rr1) shape "rectangular"
$node_(rr2) shape "rectangular"
$ns at 0.0 "$node_(ss1) label TCP2-Sender"
$ns at 0.0 "$node_(ss2) label CBR2-Sender"
$ns at 0.0 "$node_(ss3) label TCP2-Receiver"
$ns at 0.0 "$node_(ss4) label CBR2-Receiver"
$ns duplex-link $node_(ss1) $node_(rr1) 0.5Mb 20ms DropTail
$ns duplex-link $node_(ss2) $node_(rr1) 0.5Mb 20ms DropTail
$ns duplex-link $node_(rr1) $node_(rr2) 0.5Mb 20ms DropTail
$ns duplex-link $node_(rr2) $node_(ss3) 0.5Mb 20ms DropTail
$ns duplex-link $node_(rr2) $node_(ss4) 0.5Mb 20ms DropTail
$ns queue-limit $node_(rr1) $node_(rr2) 100
$ns queue-limit $node_(rr2) $node_(rr1) 100
$ns duplex-link-op $node_(ss1) $node_(rr1) orient right-down
$ns duplex-link-op $node_(ss2) $node_(rr1) orient right-up
$ns duplex-link-op $node_(rr1) $node_(rr2) orient right
$ns duplex-link-op $node_(rr2) $node_(ss3) orient right-up
$ns duplex-link-op $node_(rr2) $node_(ss4) orient right-down
$ns duplex-link-op $node_(rr1) $node_(rr2) queuePos 0.5
$ns duplex-link-op $node_(rr2) $node_(rr1) queuePos 0.5
}
build_topology $ns
Agent/TCP set nam_tracevar_ true
### TCP between ss1 and ss3 (Black)
set tcp2 [$ns create-connection TCP $node_(ss1) TCPSink $node_(ss3) 2]
$tcp2 set maxcwnd_ 8
$tcp2 set fid_ 2
set ftp2 [$tcp2 attach-app FTP]
$ns add-agent-trace $tcp2 tcp
$ns monitor-agent-trace $tcp2
$tcp2 tracevar cwnd_
### CBR traffic between ss2 and ss4 (Red)
set cbr2 [$ns create-connection CBR $node_(ss2) Null $node_(ss4) 3]
$cbr2 set packetSize_ 500
$cbr2 set interval_ 0.05
$cbr2 set fid_ 3
proc finish {} {
global ns
$ns flush-trace
puts "filtering..."
exec tclsh ../bin/namfilter.tcl B5-slow-start.nam
puts "running nam..."
exec nam B5-slow-start.nam &
exit 0
}
### set operations
$ns at 0.1 "$ftp2 start"
$ns at 1.1 "$ftp2 stop"
$ns at 0.1 "$cbr2 start"
$ns at 1.1 "$cbr2 stop"
$ns at 2.0 "finish"
### add annotations
$ns at 0.0 "$ns trace-annotate \"Normal operation of <Slow Start> with max window size, 8\""
$ns at 0.1 "$ns trace-annotate \"FTP starts at 0.1\""
$ns at 0.1 "$ns trace-annotate \"CBR starts at 0.1\""
$ns at 0.11 "$ns trace-annotate \"Initial window size is 1\""
$ns at 0.22 "$ns trace-annotate \"1 ack is coming\""
$ns at 0.26 "$ns trace-annotate \"Increase window size to 2\""
$ns at 0.38 "$ns trace-annotate \"2 acks are coming\""
$ns at 0.42 "$ns trace-annotate \"Increase window size to 4\""
$ns at 0.55 "$ns trace-annotate \"4 acks are coming\""
$ns at 0.59 "$ns trace-annotate \"Increase window size to 8\""
$ns at 0.75 "$ns trace-annotate \"8 acks are coming\""
$ns at 0.77 "$ns trace-annotate \"Keep maximum cwnd size, 8\""
$ns at 1.1 "$ns trace-annotate \"FTP stops at 1.1\""
$ns at 1.1 "$ns trace-annotate \"CBR stops at 1.1\""
$ns run
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