[ericyan]

I only said this "proxy" need to be dual-stacked. This "proxy" or "gateway" or whatever refers to the public facing part of the their stack -- if they don't have a public facing part then they don't have this problem.

The "proxy" can outsourced or manged on-perm and does not have to be shared with anyone. This "proxy" may or may not be a L7 proxy that only understands HTTP.

I run my own proxy for HTTP(S), SSH, SMTP and DNS. It took me about 1 hr to set it up. Only 4 IPv4 address are used for my whole stack, the rest are all IPv6-only.