> 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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