Create a Source NAT Rule with Persistent DIPP

Create an address object for the external IP address you plan to use.
Select
Objects
Addresses
and
Add
a
Name
and optional
Description
for the object.
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.
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.
Create the NAT policy.
Select
Policies
NAT
and click
Add
.
On the
General
tab, enter a descriptive
Name
for the policy.
(
Optional
) Enter a tag, which is a keyword or phrase that allows you to sort or filter policies.
For
NAT Type
, select
ipv4
(default).
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.
On the
Translated Packet
tab, for
Translation Type
, select
Persistent Dynamic IP And Port
.
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.
Click
OK
.
Commit
your changes.
(
Optional
) Use operational CLI commands to view persistent DIPP information.
Access the CLI.
>
show running persistent-dipp-pool
>
show running persistent-dipp-client pool <nat-pool-index>
>
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.
(
Optional
) Use configuration CLI commands to monitor persistent DIPP pool utilization. A syslog is generated if resource utilization exceeds the threshold you configured.
Access the CLI.
>
configure
#
set deviceconfig setting session persistent-dipp-alert-enable <no|yes>
#
set deviceconfig setting session persistent-dipp-alert-threshold <1-99>
#
set deviceconfig setting session persistent-dipp-alert-interval <5-120>