Path: utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!CS.WISC.EDU!hagens
From: hagens@CS.WISC.EDU
Newsgroups: comp.protocols.iso
Subject: Re: OSI IP routing on the DDN?
Message-ID: <8904281539.AA00320@janeb.cs.wisc.edu>
Date: 28 Apr 89 15:38:59 GMT
References: <5560018@hpindda.HP.COM>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
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> also, would someone explain the parsing?  Do ISO IP
> packets have protocol IDs larger than 64 to avoid
> colliding with ARPA IP packets?  (ISO IP has the
> protocol ID in the first octet, whereas ARPA IP
> uses the first nybble- if ISO IP had a protocol ID
> field less than 64, it would look like an old version
> ARPA IP packet with confused length and checksums).
> Are the checksums and length fields parsed in a "i'll
> try to parse it ARPA and see if it works" strategy?

ISO 8473 is 10000001b I don't have my ESIS spec handy to see what it uses.

rob hagens