To use DDNS servers, you must subscribe to them and usually pay for their services. When other computers want to contact your domain, their DNS gets your IP address from your DDNS server. These entries are kept up to date by your computer sending its current IP address to the DDNS server to ensure its entry is always up to date. These are public servers that store a DNS entry for your computer that includes its current IP address and associated domain name. To solve this problem there are dynamic DNS (DDNS) servers. Computers that want to contact this computer do not know what its current IP address is. It is different when a computer has a dynamic IP address, such as an IP address assigned dynamically by a DHCP server, and a domain name. 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. 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 following topics are included in this section:Ĭonfiguration overview Dynamic DNS over VPN conceptsĪ typical computer has a static IP address and one or more DNS servers to resolve fully qualified domain names (FQDN) into IP addresses. This section describes how to configure a site-to-site VPN, in which one FortiGate unit has a static IP address and the other FortiGate unit has a domain name and a dynamic IP address.
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