PAN-OS

1. Create an address object for the external IP address you plan to use.

   1. Select ObjectsAddresses and Add a Name and optional Description for the object.
   2. Select IP Netmask from the Type and then enter the IP address of the external interface on the firewall, 203.0.113.100 in this example.
   3. Click OK.

      Although you don't have to use address objects in your policies, it is a best practice because it simplifies administration by allowing you to make updates in one place rather than having to update every policy where the address is referenced.
2. Create the NAT policy.

   1. Select PoliciesNAT and click Add.
   2. On the General tab, enter a descriptive Name for the policy.
   3. (Optional) Enter a tag, which is a keyword or phrase that allows you to sort or filter policies.
   4. For NAT Type, select ipv4 (default).
   5. On the Original Packet tab, select the zone you created for your internal network in the Source Zone section (click Add and then select the zone) and the zone you created for the external network from the Destination Zone list.
   6. On the Translated Packet tab, for Translation Type, select Persistent Dynamic IP And Port.
   7. For Address Type, there are two choices. You could select Translated Address and then click Add. Select the address object you created or enter the translated source address.

      An alternative Address Type is Interface Address, in which case the translated address will be the IP address of the interface. For this choice, you would select an Interface and optionally an IP Address if the interface has more than one IP address.
   8. Click OK.
3. Commit your changes.
4. (Optional) Use operational CLI commands to view persistent DIPP information.

   1. Access the CLI.
   2. > show running persistent-dipp-pool
   3. > show running persistent-dipp-client pool <nat-pool-index>
   4. > show running persistent-dipp-client-translation ip <client-ip-address>

   Use the last two show commands at runtime to track persistent NAT resource usage by client IP address.
5. (Optional) Use configuration CLI commands to monitor persistent DIPP pool utilization. A syslog is generated if resource utilization exceeds the threshold you configured.

   1. Access the CLI.
   2. > configure
   3. # set deviceconfig setting session persistent-dipp-alert-enable <no|yes>
   4. # set deviceconfig setting session persistent-dipp-alert-threshold <1-99>
   5. # set deviceconfig setting session persistent-dipp-alert-interval <5-120>