ZyXEL Communications ZyWALL 300 User Manual

ZyWALL USG 300 User’s Guide

This chapter describes how to configure dynamic DNS (DDNS) services for the ZyWALL. 
First, it provides an overview, and then it introduces the screens. See 

for related information on these screens.

DNS maps a domain name to a corresponding IP address and vice versa. Similarly, dynamic 
DNS maps a domain name to a dynamic IP address. As a result, anyone can use the domain 
name to contact you (in NetMeeting, CU-SeeMe, etc.) or to access your FTP server or Web 
site, regardless of the current IP address.

"

If you have a private WAN IP address, then you cannot use Dynamic DNS.

Before you can use Dynamic DNS services with the ZyWALL, you first need to set up a 
dynamic DNS account with www.dyndns.org. (This is the only DNS service provider the 
ZyWALL supports at the time of writing.) DynDNS offers several DNS services. Please see 
www. dyndns.org for more information about each of them. When registration is complete, 
DynDNS gives you a password or key.

"

You must go to DynDNS’s Web site to set up a user account and a domain 
name before you can use the Dynamic DNS service with the ZyWALL.

After this, you configure the ZyWALL. Once the ZyWALL is configured, it automatically 
sends updated IP addresses to DynDNS, which helps redirect traffic accordingly.

Enable this feature to have *.yourhost.dyndns.org (for example, 

www.yourhost.dyndns.org

) 

routed to the same IP address as 

yourhost.dyndns.org

.