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From: craig@NNSC.NSF.NET (Craig Partridge)
Newsgroups: comp.protocols.tcp-ip
Subject: re: idle chatter about reference models
Message-ID: <8711181317.AA08570@ucbvax.Berkeley.EDU>
Date: Wed, 18-Nov-87 08:19:09 EST
Article-I.D.: ucbvax.8711181317.AA08570
Posted: Wed Nov 18 08:19:09 1987
Date-Received: Sat, 21-Nov-87 04:38:33 EST
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Organization: The ARPA Internet
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Mike,

    I'd say HMP belonged at the transport layer.  It can be reasonably
neatly dropped into a binary bsd kernel as a transport protocol, and
it has the usual transport functions (transport user addressing, sequence
numbers, etc).

    As for the four level ARM -- I recently argued to someone that we're
approaching five levels:

	     Application
	    [Presentation]
	      Transport
	     Internetwork
	       Network


The argument being that while we have no standard Presentation layer,
we are certainly using presentation schemes (XDR, Courier, ASN.1, multimedia
formats, etc.)

Craig