>    (2) Even when clone parent gets removed (by "ifconfig -alias" clone
>    children stays there (it is hard to do since we do not mark
>    clone children)
>This also gets in the way of renumbering (rt_ifa of the arp entry
>points to the old address).

	if my understanding is correct correct, we need to go through the
	whole tree, to check rt_ifa on PMTUD routes.

itojun