Using the Dynamic DNS (DDNS)

- What is DDNS?

The DDNS service, an IP Registry provides a public central database where information such as email addresses, hostnames, IPs etc. can be stored and retrieved. This solves the problems if your DNS server uses an IP associated with dynamic IPs.

Without DDNS, we always tell the users to use the WAN IP of the Prestige to access the internal server. It is inconvenient for the users if this IP is dynamic. With DDNS supported by the Prestige, 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 Prestige.

When the ISP assigns the Prestige a new IP, the Prestige must inform the DDNS server the change of this IP 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.

The DDNS server stores password-protected email addresses with IPs and hostnames and accepts queries based on email addresses. So, there must be an email entry in the Prestige menu 1.

The DDNS servers the ZyAIR G-4100 supports currently is www.dydns.org and www.changeip.com where you apply the DNS from and update the WAN IP to.

- Setup the DDNS

1. Before configuring the DDNS settings in the Prestige, you must register an account from the DDNS server such as WWW.DYNDNS.ORG first. After the registration, you have a hostname for your internal server and a password using to update the IP to the DDNS server.
2. Go to WEB configuration page, Advanced->DDNS.
3. Check the first rule as Active.
4. Select the Service Provider as dyndns.org (www.dyndns.org)
5. Enter the Host Name you subscribe from the DDNS server. For example, zyxelsupport.dyndns.org
6. Enter the User Name/Password that you registered from the DDNS server.
7. Click Apply to finish.

Key Settings for using DDNS function:

Option | Description
Enable DDNS | Check the Active box.
Service Provider | Enter the DDNS server in this field. Currently, we support www.dydns.org and www.changeip.com.
Registered Host Name | Enter the hostname you subscribe from the above DDNS server. For example, zyxelsupport.dyndns.org
Login User | Enter the user name that you registered from the DDNS server.
Password | Enter the password that you registered from the DDNS server.

All contents copyright © 2004 ZyXEL Communications Corporation.