NAT64 Overview

You can configure two types of NAT64 translation on a Palo Alto Networks firewall; each one is doing a bidirectional translation between the two IP address families:
A single IPv4 address can be used for NAT44 and NAT64; you don’t reserve a pool of IPv4 addresses for NAT64 only.
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.
Palo Alto Networks supports the following NAT64 features:
  • Hairpinning (NAT U-Turn); additionally, NAT64 prevents hairpinning loop attacks by dropping all incoming IPv6 packets that have a source prefix of 64::/n.
  • Translation of TCP/UDP/ICMP packets per RFC 6146 and the firewall makes a best effort to translate other protocols that don’t use an application-level gateway (ALG). For example, the firewall can translate a GRE packet. This translation has the same limitation as NAT44: if you don’t have an ALG for a protocol that can use a separate control and data channel, the firewall might not understand the return traffic flow.
  • Translation between IPv4 and IPv6 of the ICMP length attribute of the original datagram field, per RFC 4884.

Related Documentation