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AT&T has deployed 6RD instead of native dual-stack. I can get close to gigabit on IPv4, but max out at 80mbps if I use their 6RD gateway.

It also crashes some of their modems! Every few hours through normal traffic, in under a minute if I quickly visit many IPv6 addresses.

AT&T has some areas on native dual-stack now. I gather they are working on moving away from 6rd.