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What is DDNS?

April 26, 2017DDNS

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What is DDNS?

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The Dynamic DNS service allows you to alias a dynamic IP address to a static hostname, allowing your computer to be more easily accessed from various locations on the Internet. To use the service, you must first apply an account from several free Web servers such as WWW.DYNDNS.ORG. Without DDNS, we always tell the users to use the WAN IP of the ZyWALL to reach our internal server. It is inconvenient for the users if this IP is dynamic. With DDNS supported by the ZyWALL, you apply a DNS name (e.g., www.zyxel.com.tw) for your server (e.g., Web server) from a DDNS server. The outside users can always access the web server using the www.zyxel.com.tw regardless of the WAN IP of the ZyWALL. When the ISP assigns the ZyWALL a new IP, the ZyWALL updates this IP to DDNS server so that the server can update its IP-to-DNS entry. Once the IP-to-DNS table in the DDNS server is updated, the DNS name for your web server (i.e., www.zyxel.com.tw) is still usable.