Translate Internal Client IP Addresses to Your Public IP Address (Source DIPP NAT)

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 do not 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, select
Dynamic IP And Port
from the
Translation Type
list in the Source Address Translation section of the screen.
For
Address Type
, there are two choices. You could select
Translated Address
and then click
Add
. Select the address object you just created.
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.
Click
Commit
.
(
Optional
) Access the CLI to verify the translation.
Use the
show session all
command to view the session table, where you can verify the source IP address and port and the corresponding translated IP address and port.
Use the
show session id <id_number>
to view more details about a session.
If you configured Dynamic IP NAT, use the
show counter global filter aspect session severity drop | match nat
command to see if any sessions failed due to NAT IP allocation. If all of the addresses in the Dynamic IP NAT pool are allocated when a new connection is supposed to be translated, the packet will be dropped.