Hello, 

 

I´m driving myself crazy with nam. I´m trying to do some simulation with
different local area networks (LAN). The problem is that nam draws these
networks very messy when I let it automatic position. And, when I try to fix
the position with “orient righg” for example, it puts all LANs together… 

 

is there any way of setting the position of nodes?

 

Is anyone using a different tool to visualize the networks?

 

Thank you very much!!

 

De: Javier Matanza [mailto:jmata...@dea.icai.upcomillas.es] 
Enviado el: jueves, 29 de abril de 2010 10:00
Para: 'ns-users@isi.edu'
Asunto: Attempt to schedule an event with a NULL handler.

 

Hello, I´m doing my first steps in ns2. I´m trying  to construct a protocol
for ARQ. After some tries, I´ve managed to compile it. The thing is that
when I run the .tcl script I have the following message: 

 

Scheduler: attempt to schedule an event with a NULL handler.  Don't DO that
at time

 

I guess it´s because an object is sending a packet with handler=NULL. My
problem is that I don´t really know who is doing it, since when the handler
arrives to the Scheduler function I´ve lost all context. 

 

I don’t pretend you to solve my problem, I just would like to know if
there´s any “non-written” procedure for this situation to trace who´s doing
it back..

 

Than you in advance. 

 

R, 

 

Javier. 


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