>You need a route via the loopback to make this work.  This should be
>added automatically if you use /etc/ifaliases.  I believe 'ifconfig' adds
>this automatically when you add the "primary" address.
>(e.g. my machine has a route via loopback for it's primary ethernet's
>ip address)
>
>'route add $alias 127.0.0.1'

	basically, BSD code does not really expect to have multiple interface
	addresses from the same prefix (for example, 10.1.1.1/24 and
	10.1.1.2/24).  there are many assumption made about it, including
	in_ifinit().  as it is critical requirement for IPv6, KAME team is
	trying to cook up better code (it is not yet merged into *BSD).
	we will need to bring it back to IPv4 too, it seems.

itojun