[Fwd: Re: [ns] multipath in DV routing]

[Theo Pagtzis <tpagtzis@IPRG.nokia.com>]

sorry forgot to send that to the list..



-------- Original Message --------
Subject: Re: [ns] misc and dynamic packet header augementation
Date: Fri, 20 Apr 2001 11:15:14 -0700
From: Theo Pagtzis <tpagtzis@iprg.nokia.com>
Reply-To: tpagtzis@iprg.nokia.com
Organization: UCL/NOKIA
To: Lloyd Wood <L.Wood@eim.surrey.ac.uk>
References:
<Pine.GSO.4.21.0104201346370.5287-100000@regan.ee.surrey.ac.uk>

Hi Lloyd/all,

   I need to understand two things

first the "new" method for a tcl object (found in tcl-object.tcl) is not
an
instproc but just a proc. Shouldn't it be an instproc since it is a
member of
the simulator object?

Also the new method mentions explicitly the create command for the
object
creation. Does that save the tcl parser from expanding the expression :

Foobar  x  -->  Foobar create x    ?

Also on the creation of the packet format, I am thinking of changing the
static
creation to dynamic augmentation so that proper IPv6 can take place
(extn
hdrs...) what do you/people think?


Theo

UCL/ Mobile Systems


Lloyd Wood wrote:

> On Fri, 20 Apr 2001, yan feng wrote:
>
> > Do anybody know how to implement "multipath"? ns-manual says unicast DV
> > routing can generate multipath routes. And it supposes to work like "if
> > multiple candidate routes to a destination are available, all of which are
> > learned through the the same protocol, then that node can use all of the
> > different routes to the destination simultaneously". But in
> > ./tcl/rtglib/route-proto.tcl file it seems just setting multiPath_ to 1 and
> > doesn't do anything else.
>
> What version of ns are you using? DV routing was broken in
> ns2.1b6, but got fixed shortly afterwards (see ns changes page). I
> used it with multipath successfully for the simulations you'll see in:
>
> Lloyd Wood, George Pavlou, Barry Evans, Effects on TCP of routing
> strategies in satellite constellations, refereed journal paper,
> Special issue on Satellite-Based Internet Technology and Services,
> IEEE Communications Magazine, vol. 39, no. 3, pp. 172-181, March 2001.
>
> set ns [new Simulator]
> $ns rtproto DV
> Node set multiPath_ 1
>
> is sufficient to enable it on all nodes that are subsequently created.
>
> L.
>
> <L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>