In article AANLkTinQPPu_j=0EmUAF2xoJTHQSxdLUW0btGgU8zvjZ@mail.gmail.com, George Herbert george.herbert@gmail.com wrote:
It's not really a 6to4 NAT per se - it's a 6to4 application level proxy. The question is, what does Squid hand off to Apache via a IPv4 back end connection if the front end connection is IPv6.
I don't think it's useful to think of it in these terms (6to4 anything). All it is is an HTTP proxy; it receives one HTTP request from a client, then open a new connection itself to a web server and sends the same request, then sends the reply back. Whether the client connection comes via IPv6 has no impact on the backend connection, and vice versa.
Here's a diagram:
request client ------------> proxy IPv6
request proxy -----------> backend IPv4
response proxy <----------- backend IPv4
response client <------------ proxy IPv6
- river.