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Re: SIP now IPv6

Steve Deering <deering@parc.xerox.com> Sun, 27 December 1992 08:35 UTC

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To: John Curran <jcurran@nic.near.net>
Cc: sip@caldera.usc.edu, ip-encaps@sunroof.eng.sun.com, iana@isi.edu, iab@isi.edu
Subject: Re: SIP now IPv6
In-Reply-To: Your message of "Sat, 26 Dec 92 19:33:49 PST." <9212270334.AA06986@Sun.COM>
Date: Sun, 27 Dec 1992 00:34:04 -0800
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From: Steve Deering <deering@parc.xerox.com>
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> If we were discussing the assignment of a "protocol number" or "network
> protocol id", then there would not be any of the semantic implications 
> (such as "obsoleted by" or "successor to") that comes with a version field.

By precedent, the IP version field does not have a strict ordering semantics.
ST is IP version 5, but it is not the successor to IPv4.

Everyone else seemed quite happy with the idea of skipping right over
version 6 and assigning version 7 to the successor of IPv4.  That can
still be the case if SIP gets version 6 and is not chosen to succeed
IPv4.

Steve

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