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#
# Copyright (c) 1997 by the University of Southern California
# All rights reserved.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License,
# version 2, as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
#
# The copyright of this module includes the following
# linking-with-specific-other-licenses addition:
#
# In addition, as a special exception, the copyright holders of
# this module give you permission to combine (via static or
# dynamic linking) this module with free software programs or
# libraries that are released under the GNU LGPL and with code
# included in the standard release of ns-2 under the Apache 2.0
# license or under otherwise-compatible licenses with advertising
# requirements (or modified versions of such code, with unchanged
# license). You may copy and distribute such a system following the
# terms of the GNU GPL for this module and the licenses of the
# other code concerned, provided that you include the source code of
# that other code when and as the GNU GPL requires distribution of
# source code.
#
# Note that people who make modified versions of this module
# are not obligated to grant this special exception for their
# modified versions; it is their choice whether to do so. The GNU
# General Public License gives permission to release a modified
# version without this exception; this exception also makes it
# possible to release a modified version which carries forward this
# exception.
#
# $Header: /cvsroot/nsnam/ns-2/tcl/ex/tcpecn.tcl,v 1.8 2005/09/16 03:05:42 tomh Exp $
#
# A simple example for tcp ecn simulation/animation with namgraph support
# This script is adopted from ns-2/tcl/test/test-suite-ecn.tcl
set ns [new Simulator]
#
#
# Create a simple six node topology:
#
# s1 s3
# \ /
# 10Mb,2ms \ 1.5Mb,20ms / 10Mb,4ms
# r1 --------- r2
# 10Mb,3ms / \ 10Mb,5ms
# / \
# s2 s4
#
proc build_topology { ns } {
global node_
set node_(s1) [$ns node]
set node_(s2) [$ns node]
set node_(r1) [$ns node]
set node_(r2) [$ns node]
set node_(s3) [$ns node]
set node_(s4) [$ns node]
$ns duplex-link $node_(s1) $node_(r1) 10Mb 2ms DropTail
$ns duplex-link $node_(s2) $node_(r1) 10Mb 6ms DropTail
$ns duplex-link $node_(r1) $node_(r2) 1.5Mb 20ms RED
$ns queue-limit $node_(r1) $node_(r2) 25
$ns queue-limit $node_(r2) $node_(r1) 25
$ns duplex-link $node_(s3) $node_(r2) 10Mb 4ms DropTail
$ns duplex-link $node_(s4) $node_(r2) 10Mb 5ms DropTail
$ns duplex-link-op $node_(s1) $node_(r1) orient right-down
$ns duplex-link-op $node_(s2) $node_(r1) orient right-up
$ns duplex-link-op $node_(r1) $node_(r2) orient right
$ns duplex-link-op $node_(r1) $node_(r2) queuePos 0.5
$ns duplex-link-op $node_(r2) $node_(r1) queuePos 0.5
$ns duplex-link-op $node_(s3) $node_(r2) orient left-down
$ns duplex-link-op $node_(s4) $node_(r2) orient left-up
}
set f [open out.tr w]
$ns trace-all $f
set nf [open out.nam w]
$ns namtrace-all $nf
build_topology $ns
set redq [[$ns link $node_(r1) $node_(r2)] queue]
$redq set setbit_ true
# Use nam trace format for TCP variable trace
Agent/TCP set nam_tracevar_ true
set tcp1 [$ns create-connection TCP/Reno $node_(s1) TCPSink $node_(s3) 0]
$tcp1 set window_ 15
$tcp1 set ecn_ 1
set tcp2 [$ns create-connection TCP/Reno $node_(s2) TCPSink $node_(s3) 1]
$tcp2 set window_ 15
$tcp2 set ecn_ 1
set ftp1 [$tcp1 attach-app FTP]
set ftp2 [$tcp2 attach-app FTP]
# Add agent traces and variable trace
$ns add-agent-trace $tcp1 tcp1
$ns add-agent-trace $tcp2 tcp2
$ns monitor-agent-trace $tcp1
$ns monitor-agent-trace $tcp2
$tcp1 tracevar cwnd_
$tcp2 tracevar cwnd_
$ns at 0.0 "$ftp1 start"
$ns at 0.0 "$ftp2 start"
$ns at 2.0 "finish"
proc finish {} {
global ns f nf
$ns flush-trace
close $f
close $nf
#XXX
puts "Filtering ..."
exec tclsh8.0 ../nam/bin/namfilter.tcl out.nam
puts "running nam..."
exec nam out.nam &
exit 0
}
$ns run
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