IETF Logo Mail Archive

Re: Satellites running IP

William Ivancic <wivancic@grc.nasa.gov> Fri, 14 June 2002 20:02 UTC

Message-Id: <4.2.1.20020614155641.00bcf770@popserve.grc.nasa.gov>
X-Sender: caivanc@popserve.grc.nasa.gov
X-Mailer: QUALCOMM Windows Eudora Pro Version 4.2.1
Date: Fri, 14 Jun 2002 16:02:43 -0400
To: Lloyd Wood <L.Wood@eim.surrey.ac.uk>
From: William Ivancic <wivancic@grc.nasa.gov>
Subject: Re: Satellites running IP
Cc: tcpsat@grc.nasa.gov
In-Reply-To: <Pine.SOL.4.43.0206142011270.6997-100000@artemis.ee.surrey. ac.uk>
References: <4.2.1.20020614145705.00bcc470@popserve.grc.nasa.gov>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed
Sender: owner-tcpsat@grc.nasa.gov
Precedence: bulk
Status: RO
Content-Length: 1529
Lines: 50

At 08:26 PM 6/14/02 +0100, you wrote:
>On Fri, 14 Jun 2002, William Ivancic wrote:
>
> > >  When rate-based, SCPS-TP is still sending TCP-style packets, so the
> > >protocol identifier is valid.
> >
> > I disagree.  IMHO, one should not knowingly advertise a protocol number if
> > one is not conforming to those protocol characteristics.
>
>well, that would be enough to kill pwe3 work entirely if anyone there
>agreed with that.

If I read the workings of this group correctly, it is more like gateway 
implementations were one knows the network between the gateways and is 
controlling things appropriately.


> > IMHO, SCPS should advertise it's own protocol number when
> > running rate-based, no congestion control.
>
>just so that any assumptions made by intermediate systems hold true?
>not very e2e of you.


??? I don't understand the comment.  I'm taking SCPS-TP end-to-end, not 
SCPS-TP as a gateway.


>And I don't see
>http://www.ietf.org/internet-drafts/draft-floyd-tcp-highspeed-00.ps
>http://www.ietf.org/internet-drafts/draft-floyd-tcp-highspeed-00.txt
>advocating a new protocol number either, even though it modifies the
>congestion control mechanisms.

If I interpreted the draft correctly, congestion control is still used 
here, just modified.

Will


=======================================
Will Ivancic
NASA Glenn Research Center
21000 Brookpark Road    MS 54-5
Cleveland, Ohio  44135
Phone +1 (216)433-3494
Fax +1 (216) 433-8705
Yahoo Instant Messenger  ID: ivancic
http://roland.grc.nasa.gov/~ivancic

v2.8.7 | Report a Bug | By Email