Re: [ns] Newbie Questions in running NS2

[Tarik Alj <aljtarik@inrs-telecom.uquebec.ca>]

watch your syntax, Tcl must not like the close brace of finish, hence run
is not executed and route not computed -> nice barf of an error msg.

-Tarik 										



												




On Tue, 30 Jan 2001, Chien-Lung Wu wrote:

> 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
>