User`s manual

VoIP/(802.11g) ADSL2+ (VPN) Firewall Router
Chapter 4: Configuration
50
DNS
A Domain Name System (DNS) contains a mapping table for domain name and IP addresses. On the
Internet, every host has a unique and user-friendly name (domain name) such as www.helloworld.com
and an IP address. An IP address takes the form of xxx.xxx.xxx.xxx, for example 192.168.1.254. You can
think of an IP address as a telephone number for devices on the Internet, and the DNS will allow you to find
the telephone number for any particular domain name. As an IP Address is hard to remember, the DNS
converts the user-friendly name into its equivalent IP Address.
To obtain a Domain Name System (DNS) IP address automatically if your ISP has provided it when you
logon, check the Enable box. Usually when you choose PPPoE or PPPoA as your WAN - ISP protocol,
the ISP will provide the DNS IP address automatically. You may leave the configuration field blank.
Alternatively, your ISP may provide you with an IP address of their DNS. If this is the case, you must enter
the DNS IP address manually.
If you choose one of the other three protocols ─ RFC1483 Routed/Bridged and IPoA , check with your ISP
- they may provide you with an IP address for their DNS server. You must enter the DNS IP address if you
set the DNS of your PC to be the LAN IP address of this router.