my ISP has supported IPv6 for some time. The provided router out of the box doesn't do much but if you put it in passthrough mode, you can do anything IPv6 related.

After screwing with this for a few weeks, all I had was weird networking problems. v6 and v4 don't coexist nicely, especially naming, and if you want to talk to a v4 web server and only have a v6, well... you need a proxy.