PLANET ADN-4000 - Manual (Page 84)

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3.3.8 DNS
Short for Domain Name System (or Service or Server), an Internet service that translates
domain names into IP addresses. Because domain names are alphabetic, they're easier to
remember. The Internet however, is really based on IP addresses. Every time you use a
domain name, therefore, a DNS service must translate the name into the corresponding IP
address. For example, the domain name www.example.com might translate to
198.105.232.4.
The DNS system is, in fact, its own network. If one DNS server doesn't know how t
translate a particular domain name, it asks another one, and so on, until the correct IP
address is returned.
3.3.8.1 DNS Server
In this interface, you can modify the DNS server settings.
Figure: DNS Server Configuration overview
If 'Enable Automatic Assigned DNS' checkbox is selected, this router will accept the first
received DNS assignment from one of the PPPoA, PPPoE or MER/DHCP enabled PVC(s)
during the connection establishment.
If the checkbox is not selected, enter the primary and optional secondary DNS server IP
addresses. The interface is below.