>>>I'm not sure. It would add an ether_cmp() to a criticial path, but unlike
>>>the smc91cxx.c case not only in promiscuous mode. Maybe it should only check
>>>that if we are in half-duplex mode?
>>>
>>>But on the other hand, the current solution does not cause any performance
>>>hit and works - what's the problem with it?
>>
>>	the problem is that !IFF_SIMPLEX interfaces are not really supported in
>>	L3 logic.  we need to look at that (IPv4/v6 multicast, IPv6 ND, and
>>	such).  i don't think i can make IPv6 DAD work with !IFF_SIMPLEX
>>	interfaces, due to the way IPv6 DAD is specified.

	i was looking at the wrong source.  sys/net/if_ethersubr.c deals
	with it, so it should be okay.  sorry for the noise.

itojun