If you use private IP addresses within your internal networks, you must use NAT to translate the private addresses to public addresses that can be routed on external networks. If you define Layer 3 interfaces on the firewall, you can configure a Network Address Translation (NAT) policy to specify whether source or destination IP addresses and ports are converted between public and private addresses and ports. For example, private source addresses can be translated to public addresses on traffic sent from an internal (trusted) zone to a public (untrusted) zone. NAT is also supported on virtual wire interfaces.

The NAT64 option translates between IPv6 and IPv4 addresses, providing connectivity between networks using disparate IP addressing schemes, and therefore a migration path to IPv6 addressing. IPv6-to-IPv6 Network Prefix Translation (NPTv6) translates one IPv6 prefix to another IPv6 prefix.

Since NAT allows you to translate private, non-routable addresses to one or more globally-routable addresses, it helps conserve an organization’s routable IP addresses. NAT allows you to not disclose the real IP addresses of hosts that need access to public addresses and to manage traffic by performing port forwarding. You can use NAT to solve network design challenges, enabling networks with identical IP subnets to communicate with each other. The firewall supports NAT on Layer 3 and virtual wire interfaces.

NAT rules are based on source and destination zones, source and destination addresses, and application service (such as HTTP). Like Security policies, NAT security rules are compared against incoming traffic in sequence, and the first rule that matches the traffic is applied.

As needed, add static routes to the local router so that traffic to all public addresses is routed to the firewall. You may also need to add static routes to the receiving interface on the firewall to route traffic back to the private address.

In PAN-OS, you create NAT security rules that instruct the firewall which packet addresses and ports need translation and what the translated addresses and ports are.

Prisma SD-WAN NAT Policies