DDNS (Dynamic DNS) service allows you to assign a fixed domain name to a dynamic WAN IP address. This allows you to host your own Web, FTP or other type of TCP/IP server in your LAN. Before configuring DDNS, you need to visit www.dyndns.org and register a domain name. (The DDNS service is provided by DynDNS.org).
For users in China, 3322 and Peanut Hull are available. For 3322, please visit  http://www.3322.org/ to register. For Peanut Hull, please visit Vavic Network Technology website http://www.oray.net/ to register a domain name. 

DDNS Service The DDNS feature is disabled by default. To enable this feature, just select the DynDNS.org from the pull-down menu and enter Username, Password, and Host Name of the account you set up with DynDNS.org. For users in China, please select 3322.org or Peanut Hull, and enter Username, Password and Host Name of the account you set up with 3322.org or Peanut Hull. 

Internet IP Address : The Router's current Internet IP Address is displayed here. Because it is dynamic, this will change.

Status: When you finish entering the Username, Password and Host Name, click the Save Settings button, and the Status will be updated. It will show  "DDNS is updated successfully" once DDNS is updated successfully. If it shows "The hostname does not exist", "Username is not correct", "Hostname is not correct", please make sure you enter the correct information of the account you set up with DynDNS.org, 3322.org or Peanut Hull. 

Click the Save Settings button to save the DDNS settings or click the Cancel Changes button to undo your changes.