Re: NAM problems with dropped packets

[Haobo Yu <haoboy@ISI.EDU>]

I tried tcl/ex/nam-example.tcl and nam-example-em.tcl with current
snapshot and they both showed the dropped packets. There may be problems
with the last release of both ns and nam. (I only remember a problem
with error models but not with link dynamics and queue drops, though.)
In any case, you may want to use current snapshot; please download it
tomorrow. 

- Haobo

On Sun, 19 Sep 1999, Daniel Hernandez wrote:

> Dear All,
> I�m using NS version 2.1b5 and NAM 1.0a7 over RH Linux 5.2, and I�m having
> some weird errors involving visualization of packets being dropped in NAM.
> 1)       The first problem is that, I noticed that when I use the TCL
> directive "$ns duplex-link-op <node1> <node2> orient [right,left] " in NS
> simulation scripts, the packets dropped from the queue are not shown in NAM.
> If I take this single directive out, the packets being dropped are shown in
> the screen as small squares moving to the bottom of the screen. To be sure
> of this, I tested it over some other compilations of NS of some other
> fellows students, but the results were the same. Also, I look it up in the
> NS mailing list, but nothing seem to address this.
> 2)       The second problem appears when I want to run the example script
> �nam-example.tcl� that is bundled with NS into the ns/tcl/ex directory. The
> NS simulation runs fine (I think, due to the lack of error messages). When I
> run NAM over the trace file, the NAM console and simulation window opens ok,
> but whenever I click over the play button the simulation freezes and
> crashes, giving back a core dump. Again, I tested it over some other
> compilations of NS, but the results were the same. I look it up in the NS
> mailing list, but nothing seem to address this.
> The reason that I�m bundling this two apparent different problems together,
> is that I think they are related and may reveal some limitation of NAM that
> I�m not aware of.
> Some help will be very appreciated. Thanks in advance,
> 
> Daniel Hernandez
> CS Graduate Student
> Baylor University
> http://cs.baylor.edu/~hernand
> 
>