>> 	for outgoing traffic, it is just matter of routing configuration.
>> 	even if the source address is B1 or B2 (because you specified it
>> 	with bind(2), or you are TCP listener side nad have no choice)
>> 	if routing table suggests to go out from interface A, outgoing
>> 	traffic goes out from interface A.
>So basically I'm SOL.. that's alright I guess, I can still use the static
>IP address for IPv6 access (which is the main reason why I wanted it in
>the first place).

	if you try to use gif(4), assymetric routing may bite you due to
	ingress filtering (default configuartion is on secure side).  grab
	1.5R (netbsd-current) and use IFF_LINK2.

itojun