>That's better than using a global address.   But using the interface
>name is easier to manage and simpler.   Note that kernel interface
>doesn't have to have a way to pass around interface names, there's
>no reason why the route command given something like
>	route add default -int gif0
>can't go find what address is associated with gif0 and pass that in
>as the default route destinatin (using the link-local addr if
>appropriate, so it is immune to global addressing changes, and there
>doesn't need to be a processes sitting watching for renumber events).

	this is basically what we can do when we tweak route_output().

itojun