Re: dropped packet in nam

[Haobo Yu <haoboy@isi.edu>]

If packets are dropped from queues, it's automatically written to nam
trace if you do namtrace-all{}. But if you use error models to drop
packets you have to add those packets to nam traces yourself. All those
error models have a OTcl method drop-target{} to allow you put a drop
trace object there:

# Assume you want to monitor loss at an error model $em on a simplex link (n1, n2)
$em drop-target [$ns create-trace Drop [$ns get-nam-traceall] $n1 $n2 "nam"]

Do this in your sim script after you've called namtrace-all{} and it'll
add a trace line for each dropped packet there. 

- Haobo

On Tue, 2 Mar 1999, Sarah Liu wrote:

> Hi, everybody:
> 
> I wrote several scripts to generate some packet loss on different links
> using SelectErrorModel and LossMonitor.  I got the following as part of the
> result: (In this topology, I have 6 nodes)
> 
> rcvr 0 lost 55 pkt, rcv 72
> rcvr 1 lost 78 pkt, rcv 73
> rcvr 2 lost 32 pkt, rcv 49
> rcvr 3 lost 7 pkt, rcv 18
> rcvr 4 lost 7 pkt, rcv 48
> rcvr 5 lost 14 pkt, rcv 38
> 
> Right now, I am using nam-1.0a7 and from the nam documentation I got, it
> seems that "dropped packet can be shown as a rotating squares and disappear
> at the end of the screen". But I didn't see any such rotating packet during
> the animation. So, my question is : Is that possible to  visualize the loss
> of packet in nam and How? 
> 
> I would very appreciate for the help of anyone who know this.
> 
> Cheers,
> 
> Sarah
> 
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>   Sarah Xiaohui Liu, 613-765-3203                        o__     o~__
>   Email: softrel9@nortelnetworks.com                  _,>/_   _,>/_
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