>> ifconfig wm0 inet 10.0.0.1 up
>> ifconfig bridge0 create
>> brconfig bridge0 add wm0
>> brconfig bridge0 add wi0
[versus]
>> ifconfig bridge0 create
>> brconfig bridge0 add wm0
>> brconfig bridge0 add wi0
>> ifconfig bridge0 inet 10.0.0.1 up

> In the latter case, with which MAC is an ARP request answered?

I can't see why a bridge `interface' would even _have_ an IP address,
or why it would be answering ARP requests; based on reading bridge(4),
I see no reason to think it has any interest in receiving packets in
the sense of passing them to higher protocol layers on the local host.

Or does a bridge interface not only bridge but also receive?  In that
case, bridge(4) is incomplete, and a bridge interface has to have a MAC
address, which could be a locally-administered address or could come
from the MAC address of one of its component interfaces or whatever.

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