Re: ns-2.1b5 and CMU mobility code

[Padmaparna Haldar <haldar@ISI.EDU>]

On Wed, 24 Mar 1999, Samir Ranjan Das wrote:

> 
> Hi all:
> 
> I downloaded and started playing with the CMU/Monarch contributed
> mobile networking code.  (the new release v2.1b5). 
> However, I have several problems. Being new to ns, I am not
> sure how to debug it yet. But I am working on it. If 
> you plan to use this code, please read on.  If you are from CMU/Monarch
> please help.
> 
> Fisrt a comment:
> 
> 1. The validation script provided is kind of meaningless.  It stops
>    at time 10. But the first time any source starts sending is 
>    around time 22. Also looks like the nodes do not move before
>    time 600. So not much intereseting happens with the script 
>    provided. So please increase stop time. 


That is a valid bug. The initial scenario file (where nodes moved and sent
traffic at t=0 - scen-1500x300-50-0-20-1) was replaced by a smaller sized
scenario (scen-670x670-50-600-20-2) which starts around t=20. 
so you are right, the sim time should be increased. 

> 
> Now the problems:
> 
> 2. If you run with assertion on (w/o flag -DNDEBUG at complie),
>    some assertions fail.
> 
>    In DSR: assert(cmnh->direction() == -1) fails in dsragent.cc
>    If I comment it out, assert(initialized()) fails in wireless-phy.cc
>    in function senddown.
> 
>    Both of these happens around the same sim time when the first traffic
>    source becomes active. That's when DSR will send any packet. 
> 
>    In DSDV: same story ..
>    assert(initialized()) fails in wireless-phy.cc in function senddown.
>    This happens very early in simulation (may be time 0), probably at
>    the time when DSDV starts sends route updates. 
> 

I think Ya is working on putting these bugs out on the ns-problem's page,
as we speak. 

Thanks for pointing the bugs out,
--Padma.

> Samir
> 

------------------------------------------------
Be true to your work, your word, and your friend.
--Thoreau

Padmaparna Haldar
ISI/USC.
310.822.1511 #352