Hello,
I have some problems with LAN routing. I use ns-allinone-2.1b5.
I run ns on SunOS 5.6 (Solaris).
My test configuration is as follows:
na nb
| |
n0 n2
| |
+-----+
| |
n1 n3
Here n0,n1,n2,n3 are nodes in a 802_3 LAN.
na and nb are external nodes which interact with nodes inside the LAN.
I want to have three ftp traffic flows: n0->nb, nb->n1 and nb->na.
The problem is that the only traffic flow that gets through
in both directions (data/ack) was nb->n1 (as seen from nam --
you may try to diable the 'start' statement of each ftp flow
and see the result).
The script for the simulation is given below
Is there any routing statement I should add to the script ?
or is it a bug ? or is it a problem with my own ns build ?
Thanks,
Apinun.
== cut here ==
set ns [new Simulator]
set f [open out.nam w]
$ns namtrace-all $f
set n0 [$ns node]
set n1 [$ns node]
set n2 [$ns node]
set n3 [$ns node]
set nodelist_ "$n0 $n1 $n2 $n3"
set na [$ns node]
set nb [$ns node]
$ns duplex-link $na $n0 10Mb 20ms DropTail
$ns duplex-link $nb $n2 10Mb 20ms DropTail
$ns duplex-link-op $na $n0 orient down
$ns duplex-link-op $nb $n2 orient down
set lan_ [$ns make-lan $nodelist_ 10Mb 1ms LL Queue/DropTail Mac/802_3 Channel]
$ns compute-routes
set tcp0 [$ns create-connection TCP/Reno $n0 TCPSink $nb 0]
set tcp1 [$ns create-connection TCP/Reno $nb TCPSink $n1 1]
set tcp2 [$ns create-connection TCP/Reno $nb TCPSink $na 2]
$tcp0 set window_ 128
$tcp1 set window_ 128
$tcp2 set window_ 128
set ftp0 [$tcp0 attach-app FTP]
set ftp1 [$tcp1 attach-app FTP]
set ftp2 [$tcp2 attach-app FTP]
$ns at 0.1 "$ftp0 start"
$ns at 0.2 "$ftp1 start"
$ns at 0.3 "$ftp2 start"
$ns at 30.0 "$ns halt"
puts "running..."
$ns run
puts "finishing..."
$ns flush-trace
close $f
== cut here ==