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.