Or/also, nag your ISP to give you an IPv6 prefix (or switch to Comcast, because they delegate you a /62). If you still want to manage a stateful firewall then

Or/also, nag your ISP to give you an IPv6 prefix (or switch to Comcast, because they delegate you a /62). If you still want to manage a stateful firewall then go for it. But we shouldn't still need this NAT traversal crap in an IPv6 world.