Chapter 17 Ddns; Ddns Overview; Dyndns Wildcard; High Availability (Ha) - ZyXEL Communications ZyWALL 1050 User Manual

This chapter describes how to configure dynamic DNS (DDNS) services for the ZyWALL.
First, it provides an overview, and then it introduces the screens.
Configuration Overview chapter for related information on these screens.

17.1 DDNS Overview

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.
Note: 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.
Note: 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.

17.1.1 DYNDNS Wildcard

Enable this feature to have *.yourhost.dyndns.org (for example, www.yourhost.dyndns.org)
routed to the same IP address as yourhost.dyndns.org.

17.1.2 High Availability (HA)

The DDNS server maps a domain name to the IP address of one of the ZyWALL's WAN
ports. If that WAN port loses its connection, high availability allows the ZyWALL to
substitute the HA port's IP address in the domain name mapping.

Chapter 17 DDNS

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