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
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