[ns] fix snoop

[Lloyd Wood]

On Thu, 29 Mar 2001, Benyuan Liu wrote:

>   The Berkerly Snoop in NS has been broken since version ns-2.1.b4. I
> looked into the code recently and was able to make it work except for
> a small problem. In the following I will describe how I fixed and
> validated the code. Hope this will help other people in the community.

Some diffs to ns 2.1b7 or a recent snaphot would help even more... 

thanks,

L.

<L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>