[I wrote:]
The minimum set of models I think we should consider are..
A) CPE is a router connected to a native IPv6 service provider with
prefix delegation. Note: this includes dual-stack-lite CPE, as
currently proposed.
B) CPE is an IPv4/NAT router connected to a service provider where
IPv6-in-IPv4 tunneling is available with a default route to
the public
default-free zone, e.g. 6to4, tunnel-broker, etc.
Are there *any* other realistic models to consider for residential
CPE?
CPE is an IPv4/NAT router connected to a service provider
where IPv6-in-IPv4 tunneling is available with a default
route to a border gateway for the service provider, e.g.,
ISATAP (with private IPv4 address on the CPE's provider-
facing interface).