DDNS
If your external IP address changes regularly and you have a static domain name, you can configure the external interface to use a dynamic DNS (DDNS) service. This ensures that external users and customers can always connect to your company firewall. If you have a FortiGuard subscription, you can use FortiGuard as the DDNS server.
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You can configure FortiGuard as the DDNS server using the GUI or CLI.
Sample topology