[ns] LAN Nodes not being placed in order

[Syed Faraz Hasan]

Hi.

I am running the following code bu every time I run, nodes appear in different 
positions and overall visualization is very bad. How can I fix the positions of 
which node to appear where (while it is still part of LAN!). Also, I send data 
between two nodes, which goes to the main bus and is distributed to all nodes. 
How can I restrict the communication between two specific nodes only.

Please reply soon.

Faraz

set ns [new Simulator]

set tracefd [open topology.tr w]
$ns trace-all $tracefd

set nf [open out.nam w]
$ns namtrace-all $nf

proc finish {} {
        global ns nf
        $ns flush-trace
        close $nf
        exec /home/faraz/Desktop/ns-allinone-2.33/nam-1.13/nam out.nam &
        exit 0
        }

set n1 [$ns node]
set n2 [$ns node]
set n3 [$ns node]
set n4 [$ns node]
set n5 [$ns node]


$ns make-lan "$n1 $n2 $n3 $n4 $n5" 25Mb 200ms LL Queue/DropTail Mac/Csma/Cd


set udp0 [new Agent/UDP]
$ns attach-agent $n1 $udp0

set cbr0 [new Application/Traffic/CBR]
$cbr0 set packetSize_ 1000
$cbr0 set interval_ 0.005
$cbr0 attach-agent $udp0

set null0 [new Agent/Null]
$ns attach-agent $n3 $null0

$ns connect $udp0 $null0

$ns at 0.1 "$cbr0 start"
$ns at 4 "$cbr0 stop"
$ns at 4.1 "finish"


$ns run