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To solve this problem there are dynamic DNS (DDNS) servers.
Policy-based VPN configuration uses more complex and often more IPsec security policies, but does not require a static route entry.A domain name assigned to this computer is resolved by any DNS server having an entry for the domain name and its static IP address.The IP address never changes or changes only rarely so the DNS server can reliably say it has the correct address for that domain all the time.To avoid this, the remote peer must perform a DNS lookup for the domain name of to be sure of the dynamic IP address before initiating the connection.
When configuring the Phase 1 entry for a VPN tunnel, the Remote Gateway determines the addressing method the remote end of the tunnel uses as one of Static IP Address, Dialup User, or Dynamic DNS. When you select the Dynamic DNS VPN type there is a related field called Dynamic DNS.The remote peer can reply to the local Forti Gate unit using the source IP address that was sent in the packet header because it is current.Without doing a DNS lookup first, the remote peer runs the risk of the dynamic IP changing before it attempts to connect.The Dynamic DNS field is asking for the FQDN of the remote end of the tunnel.