Prestige 2302RL Support Notes
All contents copyright (c) 2007 ZyXEL Communications Corporation.
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Using Dynamic DNS (DDNS)
1.
What is DDNS?
A DNS (Domain Name Service) server stores the mappings of IP address and domain names. For example,
when users enters a web site address (the domain name), the DNS server automatically maps the web site
address to a public IP address and redirects the request to the intended web server.
Without DNS, users have to enter the IP address of the web server in order to access the web sites. This is very
inconvenient and not user-friendly as users have to remember the IP addresses of the web sites.
However, if the web server is located behind the Prestige which is using a dynamic WAN IP address, a fixed
mapping cannot be stored in the DNS server database since the WAN IP address changes. Thus Dynamic DNS
(DDNS) is used to solve this problem. For example, if you have hosted a web site (say www.zyxel.com) on a
server behind the Prestige which is assigned a dynamic WAN IP address from the ISP, users can still access the
web site from the WAN when you have set up the DDNS settings. With DDNS, users can always access a web
site regardless of the WAN IP address on the Prestige.
When the ISP assigns the Prestige a new WAN IP address, the Prestige sends this information to the DDNS
server which updates the IP-to-DNS mapping. Once the mapping is updated, outside users can still access the
web site hosted on an internal server behind the Prestige.
You must register an account with a DDNS service provider. The DDNS server saves the password-protected
e-mail address with the IP addresses and host names. Queries are serviced based on the e-mail addresses. Thus
you must set the same e-mail address you used for DDNS in the Prestige SMT menu 1.
Currently, the Prestige supports
WWW.DYNDNS.ORG
for the DDNS service. The following describes the
setup procedure.