This document describes stateful NAT64 translation, which allows
IPv6-only clients to contact IPv4 servers using unicast UDP, TCP, or
ICMP. One or more public IPv4 addresses assigned to a NAT64
translator are shared among several IPv6-only clients. When stateful
NAT64 is used in conjunction with DNS64, no changes are usually
required in the IPv6 client or the IPv4 server.