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Re: [manet] Some comments on draft-funkfeuer-manet-olsrv2-etx-01

Georg Wittenburg <georg.wittenburg@inria.fr> Tue, 24 May 2011 13:37 UTC

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From: Georg Wittenburg <georg.wittenburg@inria.fr>
Organization: INRIA
To: Henning Rogge <henning.rogge@fkie.fraunhofer.de>
Date: Tue, 24 May 2011 15:37:30 +0200
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Cc: manet@ietf.org, David Young <dyoung@pobox.com>
Subject: Re: [manet] Some comments on draft-funkfeuer-manet-olsrv2-etx-01
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Hi Henning, all,

> [...]
> > > > How can packet sizes of lost packets be measured?
> > > 
> > > Maybe with a second packet sequence number that is only increased for
> > > large packets ?
> > 
> > I don't see the problem here. Both sender and receiver can increment
> > their respective packet counters based on the packets (above a certain
> > size, or matching other conditions) which they see and ETX should just
> > work as expected. Am I overlooking something?
> 
> The receiver on a link must estimate the number of lost packets. Our draft
> does this by looking at the packet sequence number to detect missing
> packets.
> 
> If you only want to count packets of a certain size this does not work.

I see. And I agree with you that in this case you would indeed need a second 
counter just for relevant packets. Possibly another TLV, if the overhead is 
acceptable.

Best,

	Georg

-- 
Dr. Georg Wittenburg
Postdoctoral Researcher
INRIA / École Polytechnique, HIPERCOM Team
Laboratoire d'Informatique de l'École Polytechnique (LIX)
Route de Saclay, 91128 Palaiseau (CEDEX)
Phone: +33-(0)1-69334126, Fax: +33-(0)1-69334044
http://www.lix.polytechnique.fr/~wittenburg/

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