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From: lamaster@pioneer.arpa (Hugh LaMaster)
Newsgroups: comp.protocols.misc
Subject: Re: On the TCP/IP versus ISO "debate"
Message-ID: <1744@ames.UUCP>
Date: Thu, 11-Jun-87 14:36:36 EDT
Article-I.D.: ames.1744
Posted: Thu Jun 11 14:36:36 1987
Date-Received: Sat, 20-Jun-87 11:36:25 EDT
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Reply-To: lamaster@pioneer.arc.nasa.gov (Hugh LaMaster)
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In article <8706111658.AA14605@ames-nas.arpa> yamo@AMES-NAS.ARPA (Michael J. Yamasaki) writes:

>
>Whew.  Perhaps, I'm confused.  In my world there is a thing called the ISO
>Reference Model.  This is a thing which describes a seven layer "onion", uh,

This is actually the OSI Reference Model (Open Systems Interconnect).  ISO is
the International Standards Organization.  It is confusing.  But OSI does not
specify any protocols.  There are many ISO protocols however.

*******************

Moving on to something else, I have been looking at the ISO protocols the last
few days, and it finally occurred to me exactly what I didn't like.  The
problem, for an internet user, is that X.25 is not, and cannot ever be, a
complete layer 3 protocol.  In fact, it could be a layer 2.5 protocol, which
is sort of the way that the current Arpanet uses it: as the host interface
protocol, which IP sits on top of.  Now, I haven't seen any ES-IS proposals,
so I can't legitimately complain about it, but the published intention was to
write it as a GATEWAY to X.25, which I think is entirely incorrect.  Instead,
X.25 should be moved to its proper place in level 2 and be one of the many
media that IP can run on top of.  Then, in layer 3, there needs to be a
definition of "The Internet Addressing Standard" as applied to the new ISO IP,
with re-implementations of name service, domain name service, gateways, etc.
X.25 might be used by some gateways to talk to each other, or, the gateways
might use something else (a lot of people are putting TCP/IP on T1 now; is
there a "standard encapsulation"?).  Comments?




  Hugh LaMaster, m/s 233-9,  UUCP {seismo,topaz,lll-crg,ucbvax}!
  NASA Ames Research Center                ames!pioneer!lamaster
  Moffett Field, CA 94035    ARPA lamaster@ames-pioneer.arpa
  Phone:  (415)694-6117      ARPA lamaster@pioneer.arc.nasa.gov

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