[ns] Newbie Questions in running NS2

[Chien-Lung Wu <cwu4@unity.ncsu.edu>]

Hi,

As a newbie in NS2, I try a simple file (copy from the NS2 manual) to feel
NS2. I get the example from NS2 manual 

#sample.tcl 
set ns [new Simulator]
set f [open out.tr w]
 
$ns trace-all $f
 
set nf [open out.nam w]
 
$ns namtrace-all $nf
 
set n0 [$ns node] set n1 [$ns node] set n2 [$ns node] set n3 [$ns node]
 
set udp0 [new Agent/UDP] $ns attach-agent $n0 $udp0
 
set cbr0 [new Application/Traffic/CBR] $cbr0 attach-agent $udp0 $udp0 set
class_ 0
 
 
set null0 [new Agent/Null] $ns attach-agent $n3 $null0
 
$ns connect $udp0 $null0 $ns at 1.0 "cbr0 start"
 
puts [$cbr0 set packetSize_] puts [$cbr0 set interval_]
 
 
set tcp [new Agent/TCP] $tcp set class_ 1 $ns attach-agent $n1 $tcp
 
set sink [new Agent/TCPSink] $ns attach-agent $n3 $sink
 
set ftp [new Application/FTP] $ftp attach-agent $tcp $ns at 1.2 "$ftp
start"
 
$ns connect $tcp $sink $ns at 1.35 "$ns detach-agent $n0 $tcp; $ns
detach-agent $n3 $sink"
 
 
$ns at 3.0 "finish"
 
proc finish{ } {
 
        global ns f nf
        $ns flush-trace
        close $f
        close $nf
 
        puts "running nam .."
        exec nam out.nam &
        exit 0 }
 
$ns run                                      
####### end of sample.tcl



When I run the simulator, I got the message:

[root@bone Intention-Driven-iTrace]# ns sample.tcl 
210
0.0037499999999999999 routes not yet computed
    (_o31 cmd line 1)
    invoked from within "$self cmd lookup $nodeid $destid"
    (procedure "_o31" line 18)
    (RouteLogic lookup line 18)
    invoked from within "$r lookup $i $j"
    (procedure "_o3" line 26)
    (Simulator compute-flat-routes line 26)
    invoked from within "$self compute-flat-routes"
    (procedure "_o3" line 5)
    (Simulator compute-routes line 5)
    invoked from within "[Simulator instance] compute-routes"
    (procedure "Agent/rtProto/Static" line 2)
    (Agent/rtProto/Static init-all line 2)
    invoked from within "Agent/rtProto/Static init-all"
    (procedure "_o31" line 8)
    (RouteLogic configure line 8)
    invoked from within "[$self get-routelogic] configure"
    (procedure "_o3" line 4)
    (Simulator run line 4)
    invoked from within "$ns run"
    (file "sample.tcl" line 63)             

What's wrong with this?

I download the ns-allinone-2.1b7a and ./install it successfully. Do
I miss something, since it seems that I miss something in the related lib?


Can anybody help me out?

As my research, I need to create a new module (new componets) in
NS2? Could anyone give me the pointer how can I modify/add a new module?

Thanks,


C.L
set ns [new Simulator]

set f [open out.tr w]

$ns trace-all $f

set nf [open out.nam w]

$ns namtrace-all $nf

set n0 [$ns node]
set n1 [$ns node]
set n2 [$ns node]
set n3 [$ns node]

set udp0 [new Agent/UDP]
$ns attach-agent $n0 $udp0

set cbr0 [new Application/Traffic/CBR]
$cbr0 attach-agent $udp0
$udp0 set class_ 0


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

$ns connect $udp0 $null0
$ns at 1.0 "cbr0 start"

puts [$cbr0 set packetSize_]
puts [$cbr0 set interval_]


set tcp [new Agent/TCP]
$tcp set class_ 1
$ns attach-agent $n1 $tcp

set sink [new Agent/TCPSink]
$ns attach-agent $n3 $sink

set ftp [new Application/FTP]
$ftp attach-agent $tcp
$ns at 1.2 "$ftp start"

$ns connect $tcp $sink
$ns at 1.35 "$ns detach-agent $n0 $tcp; $ns detach-agent $n3 $sink"


$ns at 3.0 "finish"

proc finish{ } {

		global ns f nf
		$ns flush-trace
		close $f
		close $nf

		puts "running nam .."
		exec nam out.nam &
		exit 0
}

$ns run