Re: [ns] problems regarding ns

[Lloyd Wood <l.wood@eim.surrey.ac.uk>]

On 20 Mar 2001, pino pino wrote:

> we've students of "Roma 3 university" and, for our studies we met
> the use of ns. Using ns with distance vectors (rtproto dv) we've
> just note something strange.... so we'd like to know how it
> exactly works.... we mean, the vectors that's send seems to be
> just somthing visual, and really they don't have any use if not to
> been displayed. so, question is: do the routing table been
> calculated by the sending of those vectors, or they just been
> calculated by neighbour greetings?

The sending of those little packets you see in nam _is_ the neighbour
greetings as far as DV routing is concerned. It matters; there is some
propagation time before the network topology is fully known by all
nodes.
 
> beaside this, we've need also to know how "rtproto dv" sintax is.
> for example, we have 3 nodes, and of those just 2 have to perform distance vector routing. Manual says a sintax, but after a day of trying we've can't manage to do what we need...
> the line we've tryed is $ns rtprotoDV $n1 $n2
> and it seems it doesn't work.
> how can we do? 

There's some discussion of per-node routing in the archive back when
DV routing got fixed after ns 2.1b6 was released. Guo Liang posted
discussion of this and some fixes to enable e.g. per node multi-path
DV routing to be selected on some nodes when DV routing was selected
globally, which may be relevant.

L.

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