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From: CERF@A.ISI.EDU
Newsgroups: comp.protocols.tcp-ip
Subject: Re: ethernet multicast
Message-ID: <[A.ISI.EDU]15-Aug-87.21:29:39.CERF>
Date: Sat, 15-Aug-87 21:29:00 EDT
Article-I.D.: <[A.ISI.EDU]15-Aug-87.21:29:39.CERF>
Posted: Sat Aug 15 21:29:00 1987
Date-Received: Sun, 16-Aug-87 12:10:28 EDT
References: <1311@bloom-beacon.MIT.EDU>
Sender: daemon@ucbvax.BERKELEY.EDU
Distribution: world
Organization: The ARPA Internet
Lines: 4

You should look into host group multicast - see Bob Braden or the
RFCs for details.

Vint Cerf