> At least the former usage has some certain applications. For example, in > case of NAT64, if a dual-stack host could distinguish synthesized IPv6 > addresses from native IPv6 addresses, it will not prefer a synthesized IPv6 > address to an IPv4 address for initiating a communication with an IPv4 host.
The well known prefix is easy to recognize, so there is no problem there. For stateless, the design makes sure that the IPv4 translatable addresses can be routed natively, which means there is no reason to not prefer them. That leaves a pretty small domain of applicability for any scheme that would reserve identifier patterns... -- Christian Huitema -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
