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From: info-vax@ucbvax.ARPA
Newsgroups: fa.info-vax
Subject: 3 Protocol Query
Message-ID: <6369@ucbvax.ARPA>
Date: Fri, 19-Apr-85 16:00:35 EST
Article-I.D.: ucbvax.6369
Posted: Fri Apr 19 16:00:35 1985
Date-Received: Sat, 20-Apr-85 07:44:27 EST
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Organization: University of California at Berkeley
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From: Jeffrey R. Del Papa <DP@MIT-MC>

it is fully possible to have several protocols on one peice of coax. at
lmi we have chaosnet, tcp/ip, and xns all on the same wire. the only problem
comes with the new ethernet ieee standard for packet format. under the
old 802.2 you have 6 bytes of destination ether address, 6 bytes of source
ether address and a 2 byte type code. under the new 802.3, you have
the 12 bytes of address, followed by two bytes of length information.
there is a type field somewhere, but it means all the protocols will have
to have the transport layer changed, and it isn't possible to run both
protocols on the same wire. so much for standards ....

						jeff