SBG3500-N Series User’s Guide
219
CHAPTER 12
Dynamic DNS Setup
12.1 Overview
DNS
DNS (Domain Name System) is for mapping a domain name to its corresponding IP address and
vice versa. The DNS server is extremely important because without it, you must know the IP
address of a machine before you can access it.
In addition to the system DNS server(s), each WAN interface (service) is set to have its own static
or dynamic DNS server list. You can configure a DNS static route to forward DNS queries for certain
domain names through a specific WAN interface to its DNS server(s). The SBG3500-N Series uses a
system DNS server (in the order you specify in the Broadband screen) to resolve domain names
that do not match any DNS routing entry. After the SBG3500-N Series receives a DNS reply from a
DNS server, it creates a new entry for the resolved IP address in the routing table.
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.
12.1.1 What You Can Do in this Chapter
•Use the DNS Entry screen to view, configure, or remove DNS routes (Section 12.2 on page
220).
•Use the Dynamic DNS screen to enable DDNS and configure the DDNS settings on the
SBG3500-N Series (Section 12.3 on page 221).
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