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Article #65

Multicast source addresses

#65
From: Dave P. Wiltzius
Date: Tue, 16 May 1989 17:32
26 lines
1601 bytes
I'm currently in a discussion with two vendors (who shall
remain nameless); one makes a brouter and another sells
a network management software package.  The software not
only recognizes 802.3 format packets (and not "Ethernet")
but also - get this - sets the multicast bit in the MAC
level source address.  Unfortunately, the brouter notices
this and drops the packet.  I know at least one bridge
that will *learn* the multicast address (which could
result in defeating that multicast address - I didn't
check).

I would like the brouter to be a bit more lenient (i.e.
forward the packet as appropriate but don't learn the
multicast source address) and the software vendor to
fix the code (let "Blue Book" Ethernet - type field in
bytes 12-13 be supported, not just 802.3 - length in
bytes 12-13 . . .) and don't set that multicast bit
in the source address.

Could people send me the names of LAN software that
they have found that puts a multicast/broadcast
in the MAC level source address?  I know of two, and
one was just recently fixed.  Thanks much.

  Dave Wiltzius (wiltzius@lll-lcc.llnl.gov)
  Lawrence Livermore Nat'l Lab
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!well!lll-lcc!wiltzius
From: wiltzius@lll-lcc.UUCP (Dave P. Wiltzius)
Newsgroups: comp.protocols.pcnet,comp.protocols.tcp-ip,comp.dcom.lans
Subject: Multicast source addresses
Message-ID: <2480@lll-lcc.UUCP>
Date: 16 May 89 17:32:25 GMT
Reply-To: wiltzmus@lll-crg.UUCP (Dave P. Wiltzius)
Followup-To: comp.protocols.pcnet
Organization: CRG, Lawrence Livermore Labs
Lines: 26