Draytek Vigor2830 Series User Manual page 137

DNS Server
Configuration
and the maximum is 253.
Gateway IP Address - Enter a value of the gateway IP address
for the DHCP server. The value is usually as same as the 1st IP
address of the router, which means the router is the default
gateway.
DHCP Server IP Address for Relay Agent - Set the IP address
of the DHCP server you are going to use so the Relay Agent can
help to forward the DHCP request to the DHCP server.
DNS stands for Domain Name System. Every Internet host must
have a unique IP address, also they may have a human-friendly,
easy to remember name such as www.yahoo.com. The DNS
server converts the user-friendly name into its equivalent IP
address.
Force DNS manual setting - Force Vigor router to use DNS
servers in this page instead of DNS servers given by the Internet
Access server (PPPoE, PPTP, L2TP or DHCP server).
Primary IP Address -You must specify a DNS server IP address
here because your ISP should provide you with usually more than
one DNS Server. If your ISP does not provide it, the router will
automatically apply default DNS Server IP address: 194.109.6.66
to this field.
Secondary IP Address - You can specify secondary DNS server
IP address here because your ISP often provides you more than
one DNS Server. If your ISP does not provide it, the router will
automatically apply default secondary DNS Server IP address:
194.98.0.1 to this field.
The default DNS Server IP address can be found via Online
Status:
If both the Primary IP and Secondary IP Address fields are left
empty, the router will assign its own IP address to local users as a
DNS proxy server and maintain a DNS cache.
If the IP address of a domain name is already in the DNS cache,
the router will resolve the domain name immediately. Otherwise,
the router forwards the DNS query packet to the external DNS
server by establishing a WAN (e.g. DSL/Cable) connection.
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Vigor2830 Series User's Guide