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Re: Port numbers and IPv6

2005-07-15 23:53:09
Which is exactly the point.

John

----- Original message -----
From:Steven M. Bellovin  <smb(_at_)cs(_dot_)columbia(_dot_)edu>
To:Spencer Dawkins <spencer(_at_)mcsr-labs(_dot_)org>
Cc:IETF Discussion <ietf(_at_)ietf(_dot_)org>
Subject:Re: Port numbers and IPv6
In message <0ab201c589aa$64860ec0$92087c0a(_at_)DFNJGL21>, "Spencer Dawkins" 
writes:
It would be OK if someone smart responded to this posting, but until 
they show up, http://www.ietf.org/rfc/rfc2960.txt is showing

- a 16-bit source and destination port numbers in the common header 
(3.1), AND

- a 16-bit stream identifier (3.3.1), AND

- a 32-bit Payload Protocol Identifier (3.3.1)

so there seems to be a large number of bits to identify a bunch of 
different "connections" and/or "protocols" in SCTP.

Ned, could you be remembering the PPI?

To be honest, I believe all the SCTP network traces I've seen had 
zeros in both the stream identifier and PPI, but the bits are there...


If nothing else, with SCTP a single client could open multiple streams 
on one connection, rather than use multiple connections.  

                --Steven M. Bellovin, http://www.cs.columbia.edu/~smb



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