re: idle chatter about reference models


Craig Partridge (craig@NNSC.NSF.NET)
Sat, 14 Nov 87 11:47:57 -0500


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



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