NAT64 operates on Layer 3 interfaces, subinterfaces, and tunnel
interfaces. To use NAT64 on a Palo Alto Networks firewall for IPv6-initiated
communication, you must have a third-party
DNS64 Server or a solution
in place to separate the DNS query function from the NAT function.
The DNS64 server translates between your IPv6 host and an IPv4 DNS
server by encoding the IPv4 address it receives from a public DNS
server into an IPv6 address for the IPv6 host.