Thanks for your response.
I'm aware that iTunes filters traffic outside of its subnet, I'm
thinking a pf.conf(5) rule something like
nat on enc0 inet proto udp from $subnet_A to 224/4 port = 5353 ->
might successfully fool iTunes into not filtering the traffic. This
wouldn't successfully route the packet, however, as my routing table
which I guess means that multicasted traffic needs the assistance of
mrouted(8) or the like to find its destination. Or could I use the
route-to option in pf.conf(5) to do this without the complication of
running a multicast routing daemon, something like
pass in on enc0 route-to ( enc0 $subnet_B ) inet from $subnet_A to
I'll experiment with that a bit, but any assistance in the mean time
would be appreciated.