Re: Conversion to OPNET

[dovrolis@hertz.ece.wisc.edu (Konstantinos Dovrolis)]

> 
> I have never heard of anyone converting ns code to run inside OPNET
> (or vice-versa).  It would be interesting to hear about how hard this
> is (my guess is fairly painful, but not impossible).
> 

We currently use both OPNET and NS. Although it would be quite a
dream to be able to port code between the two, it seems to me 
a quite difficult task (so difficult that I would never try it...)
The problem is that OPNET's TCP module is a very complete and 
complicated one:
it models all the details of connection establishment and teardown,
and all the interactions with the application layer upwards and the
IP layer downwards.

> 
> So, I have to ask--- what is it about OPNET that you find lacking in
> NS that causes you to be willing to invest the effort required to port the
> full tcp stuff?

I have the same question. On the other hand, when we asked a company
that we are doing a work for what simulator to use, they were quite
restrictive on OPNET. It seems to me that the industry world, as
opposed to the research world, prefers OPNET or COMNET at this point;
perhaps because they still don't know about ns well enough. Or
because they want software that is more stable. Time will show.

Constantinos

> 
> - K