If your ISP changes your external IP address on a regular basis, and you have a static domain name, you can configure the external interface to use a dynamic DNS service to ensure external users and/or customers can always connect to your company firewall.
If you have a FortiGuard subscription, you can use FortiGuard as your DDNS server. To configure dynamic DNS in the web-based manager, go to System > Network > DNS, select Enable FortiGuard DDNS, and enter the relevant information for the interface communicating to the server, and which server to use, and relevant information.
If you do not have a FortiGuard subscription, or want to use an alternate server, you can configure dynamic DNS in the CLI use the commands below. Within the CLI you can configure a DDNS for each interface. Only the first configured port appears in the web-based manager. Additional commands vary with the DDNS server you select.
config system ddns
set monitor-interface <external_interface>
set ddns-server <ddns_server_selection>
You can also use FortiGuard (when subscribed) as a DDNS as well. To configure, use the CLI commands:
config system fortiguard set ddns-server-ip
set ddns-server-port end
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