> => low overhead (i.e. BAKE, SUCV) proposals won't apply (no home agent), While there is not an agent per se, there is a notion of a home which is the previous set of prefixes. In a sense each node is its own home agent. Thus the ability to use return routability as an authorization check for e.g. BAKE can be used to handle attacks from attackers that are not on the path. Erik