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VoIP/(802.11g) ADSL2+ (VPN) Firewall Router
Chapter 4: Configuration
51
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 is a 32-bit number in 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 friendly name into its equivalent IP Address.
You can 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,
it 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 the LAN IP address of this router.
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