Chapter 20 DNS

20.10 Dynamic DNS

Dynamic DNS allows you to update your current dynamic IP address with one or many dynamic DNS services so that anyone can contact you (in NetMeeting, CU-SeeMe, etc.). You can also access your FTP server or Web site on your own computer using a domain name (for instance myhost.dhs.org, where myhost is a name of your choice) that will never change instead of using an IP address that changes each time you reconnect. Your friends or relatives will always be able to call you even if they don't know your IP address.

First of all, you need to have registered a dynamic DNS account with www.dyndns.org. This is for people with a dynamic IP from their ISP or DHCP server that would still like to have a domain name. The Dynamic DNS service provider will give you a password or key.

"You must go to the Dynamic DNS service provider’s website and register a user account and a domain name before you can use the Dynamic DNS service with your ZyWALL.

20.10.1 DYNDNS Wildcard

Enabling the wildcard feature for your host causes *.yourhost.dyndns.org to be aliased to the same IP address as yourhost.dyndns.org. This feature is useful if you want to be able to use, for example, www.yourhost.dyndns.org and still reach your hostname.

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

20.11Configuring Dynamic DNS

To change your ZyWALL’s DDNS, click ADVANCED > DNS > DDNS. The screen appears as shown.

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ZyWALL 2 Plus User’s Guide