> 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

This is a standard concept in routing even outside of IPv6.
You do not need a next hop address for p2p links.  It would be
great if someone stepped up and implemented it in NetBSD, but
so far no-one, including myself, has found the time.

Chris.