User's Manual

ISG50 User’s Guide 317
CHAPTER 17
DDNS
17.1 DDNS Overview
Dynamic DNS (DDNS) services let you use a domain name with a dynamic IP address.
17.1.1 What You Can Do in this Chapter
•Use the DDNS screen (see Section 17.2 on page 318) to view a list of the configured DDNS
domain names and their details.
•Use the DDNS Add/Edit screen (see Section 17.2.1 on page 319) to add a domain name to the
ISG50 or to edit the configuration of an existing domain name.
17.1.2 What You Need to Know
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: You must have a public WAN IP address to use Dynamic DNS.
You must set up a dynamic DNS account with a supported DNS service provider before you can use
Dynamic DNS services with the ISG50. When registration is complete, the DNS service provider
gives you a password or key. At the time of writing, the ISG50 supports the following DNS service
providers. See the listed websites for details about the DNS services offered by each.
Note: Record your DDNS account’s user name, password, and domain name to use to
configure the ISG50.
After, you configure the ISG50, it automatically sends updated IP addresses to the DDNS service
provider, which helps redirect traffic accordingly.
Table 99 DDNS Service Providers
PROVIDER SERVICE TYPES SUPPORTED WEBSITE
DynDNS Dynamic DNS, Static DNS, and Custom DNS www.dyndns.com
Dynu Basic, Premium www.dynu.com
No-IP No-IP www.no-ip.com
Peanut Hull Peanut Hull www.oray.cn
3322 3322 Dynamic DNS, 3322 Static DNS www.3322.org