Stephen,
Perhaps, if the folks hadn't been so dogmatically against NAT at the time, the v4-to-v6 transition model would have worked similarly and we'd be done with it by now...
I doubt it. The underlying problem with NAT doesn't go away whatever you do. IMHO, there probably isn't any true solution that doesn't involve a mechanism for distributing address-to-address mappings in some shape or form, so that all parties have the same view of whatever address mapping applies to a given e2e traffic flow. (It doesn't matter for this argument whether you're using the address mapping to perform NAT, encapsulation, or SHIM6 type address-swapping.) If you try to design a better NAT-PT, I'm pretty sure it will involve signalling back to the IPv6 side that "your correspondent believes that your address is ::FFFF:192.0.2.3", or some such. Brian _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf