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Date:      Thu, 2 Jan 2014 17:43:56 +1100
From:      Peter Jeremy <peter@rulingia.com>
To:        freebsd-net@freebsd.org
Subject:   Re: IPv4 Multicast MAC Address issues
Message-ID:  <20140102064356.GL87348@server.rulingia.com>
In-Reply-To: <20140101200303.GS99167@funkthat.com>
References:  <20140101085721.GA34334@server.rulingia.com> <20140101200303.GS99167@funkthat.com>

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On 2014-Jan-01 12:03:04 -0800, John-Mark Gurney <jmg@funkthat.com> wrote:
>Peter Jeremy wrote this message on Wed, Jan 01, 2014 at 19:57 +1100:
>> I'm trying to use multicast on my home network for the first time and
>> have found an apparent anomoly in the destination MAC address.
=2E..
>> FreeBSD shows that as the multicast MAC filter.  Unfortunately, it
>> seems that (at least on FreeBSD-10), the destination MAC address
>> uses the low 23 bits of the IP address of my default route.

>This is probably a bug, and I have confirmed this on:
>FreeBSD carbon.funkthat.com 11.0-CURRENT FreeBSD 11.0-CURRENT #4 r256870:2=
58399M: Wed Nov 20 12:33:22 PST 2013     jmg@carbon.funkthat.com:/usr/src/s=
ys/amd64/compile/lockprof  amd64

Thanks.  I've since checked 9.2/amd64 and it's OK there, so this is a
regression.  I've raised kern/185395.

--=20
Peter Jeremy

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