FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
Nishtha_Baria
Article Id 257592
Description This article describes how to modify the IP given by ISP on FortiGate. If doing so it is needed to make sure that the changes are made to SD-WAN settings as well.
Scope FortiGate.
Solution

- First, modify the WAN interface by selecting Network -> Interfaces -> WAN port. To make these changes, select edit, change it to the desired IP address, and then select OK.

 

- The screenshot below shows the previous settings before the change of WAN1:

 

Picture1.png

 

- The screenshot below shows the settings after the change of WAN1:

 

Picture2.png

 

Note that making the changes in WAN1 Interface will not automatically update the gateway in SD-WAN. It is necessary to update SD-WAN settings.

 

- Go to Network -> Interfaces -> SD-WAN.

 

- Select the interface wan1 then select edit and change the gateway to the new ip. Enter the same IP as the wan1 interface. Select OK to save changes.

 

- The following screenshot shows the configuration before the change of WAN1 Gateway:

 

Picture3.png

 

- The following screenshot shows the configuration after the change of WAN1 Gateway:

 

Picture4.png

Picture5.png

 

For further assistance, contact Fortinet Support.