RE: Last Word on An IPS Transport Protocol?

["Douglas Otis" <dotis@sanlight.net>]

David,

Some have interpreted your comment to infer SCTP is not a suitable protocol
for discussion.  As SCTP does include TCP like congestion control (RFC 2581
compliance), could you clarify SCTP as a suitable protocol of merit.

Doug

> -----Original Message-----
> From: owner-ips@ece.cmu.edu [mailto:owner-ips@ece.cmu.edu]On Behalf Of
> Black_David@emc.com
> Sent: Monday, September 25, 2000 11:10 AM
> To: ycheng@advansys.com; Black_David@emc.com; ips@ece.cmu.edu
> Subject: RE: Last Word on An IPS Transport Protocol?
>
>
> > My contention is the current TCP congestion control is NOT good
> enough and
> > the ACK traffic on a network with long latency delay is BAD.
> We must have
> > streamed transfer on a network with long latency.  Therefore,
> defining the
> > ACK of TCP is critical.  The TCP header format is not sacred to me.
>
> It's time to put my WG co-chair hat on and play "bad cop" ...
>
> There are experimental and production results indicating that TCP is
> capable of saturating arbitrarily high bandwidth networks with arbitrarily
> long delays.  Buffering proportional to the bandwidth-delay product is
> a good idea, so this doesn't come for free.  Streaming transfer
> can be achieved without playing these sort of ACK games - of course
> if congestion is encountered, TCP backs off dramatically.
>
> This WG does not have the license to fundamentally change TCP's
> congestion control algorithm or to use a transport that does not implement
> congestion control in a sufficiently TCP-like manner (RFC 2581 compliance
> is sufficient); the co-chairs and ADs will reject any document that
> tries to do either of these things.  Please don't consume list bandwidth
> in further discussion of this.
>
> Developing a new transport with sufficient congestion control is going to
> take time.  If the WG were to go in this direction, at least a year should
> be added to all of the completion milestones in the charter.
>
> --David
>
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