[Bug 234472] CARP using wrong multicast MAC destination (was: Missing outgoing CARP traffic on interface)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234472

--- Comment #11 from Kristof Provost <kp at freebsd.org> ---
I'm not sure that's a good idea for a change. As you say, you can solve your
problem by telling pf to not route-to for the multicast subnet, but if we'd add
the (also somewhat unexpected) implicit behaviour of not doing that for
multicast ranges there'd be no way to configure what you just ran into. 

You might not want to have route-to rewrite the MAC address, but there's
certainly cases where you'd want it to route out of a different interface
(which is possible if you don't specify an IP address with the route-to). I
also don't think we should make that impossible.

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