From owner-freebsd-net  Thu Jul 12  7:24: 9 2001
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Date: Thu, 12 Jul 2001 09:24:01 -0500 (CDT)
From: mark tinguely <tinguely@web.cs.ndsu.NoDak.edu>
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To: dcs@newsguy.com, net@FreeBSD.ORG
Subject: Re: Multicasting and routes
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>  It seems there is a problem in our IP stack with regards to
>  multicasting. The symptoms is the inability to send multicast packets on
>  correctly configured sockets in the absence of a default (or,
>  erroneously, multicast address being used) route.

I don't know if I am reading your question correctly, but have you
tried adding a multicast route? In /etc/rc.conf:

static_routes="multicast loopback"
route_multicast="224.0.0.0 -netmask 0xf0000000 -interface ${hostname}"

this allows only one interface to send the multicast packets, and requires
a multicast router to place the packets on the other interfaces.

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