Re: [conex] ConEx as sender side only modification

Thanks

This then means that a policer need to give some extra slack for normal TCP. It is perhaps doable with a policer that somehow has access to the TCP acks in the reverse direction and then can determine both RTT with a reasonable accuracy and also if TCP ECE is modified according to (http://tools.ietf.org/id/draft-kuehlewind-conex-tcp-modifications-01.txt) 
Or is this perhaps simpler ?

/Ingemar

PS
Realized that I got things a bit backwards in my question below, thought that ECE is clamped to 1 for an RTT...

> -----Original Message-----
> From: Mirja Kuehlewind [mailto:mirja.kuehlewind@ikr.uni-stuttgart.de] 
> Sent: den 14 november 2011 17:43
> To: conex@ietf.org
> Cc: Ingemar Johansson S
> Subject: Re: [conex] ConEx as sender side only modification
> 
> Hi Ingemar,
> 
> yes there are only sender-side modification needed. If you 
> only have the 'classic' ECN, you will only be able to get (at 
> max) one congestion notification per RTT. If there is more 
> than one CE marking per RTT you will underestimate the congestion.
> 
> Mirja
> 
> 
> On Monday 14 November 2011 11:16:04 Ingemar Johansson S wrote:
> > Hi
> >
> > Have not been able to follow the ConEx list in detail but reading 
> > http://tools.ietf.org/id/draft-briscoe-conex-initial-deploy-00.txt
> > I can see that received side modifications are optional.
> > This is of course interesting at least if consinder the 
> normal server 
> > client architecture as it is easier to modify a million 
> servers than a 
> > zillion clients. Assuming that I read right...
> > How does it work with TCP, I know TCP modifications have been 
> > considered to make TCP echo back the exact correct number 
> of ECN-CE to 
> > the server. Does this then mean that a TCP flow (unmodified 
> TCP) will 
> > state a higher congestion level in the dest-opts than the actual ?
> >
> > /Ingemar
> >
> > =================================
> > INGEMAR JOHANSSON  M.Sc.
> > Senior Researcher
> >
> > Ericsson AB
> > Wireless Access Networks
> > Labratoriegränd 11
> > 971 28, Luleå, Sweden
> > Phone +46-1071 43042
> > SMS/MMS +46-73 078 3289
> > ingemar.s.johansson@ericsson.com
> > www.ericsson.com
> > =================================
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> 
> 
> 
> --
> -------------------------------------------------------------------
> Dipl.-Ing. Mirja Kühlewind
> Institute of Communication Networks and Computer Engineering 
> (IKR) University of Stuttgart, Germany Pfaffenwaldring 47, 
> D-70569 Stuttgart
> 
> tel: +49(0)711/685-67973
> email: mirja.kuehlewind@ikr.uni-stuttgart.de
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> -------------------------------------------------------------------
> 