Re: Whatever happened to the great migration to IPv6?
"On the access side (e.g. end users) you can give them IPv6, but if you were to do only that they wouldn't see the vast majority of the Internet. "
not true, there are IPv6 to IPv4 gateway address ranges that map 1:1 from IPv6 to IPv4. One of those, the "well known" mechanism, is described here:
https://en.wikipedia.org/wiki/IPv6_transition_mechanisms#NAT64
(in this case the ISP would have to supply a NAT64 server to deal with the IPv4 connections)
There are others, but generally speaking direct IPv4 to IPv4 would be preferred, yeah. This could ALSO be done via NAT, if the ISP-assigned IPv4 address is an RFC1918 address, for example. [cheaper services do this sometimes, yeah]