Draytek Vigor 2110 User Manual page 110

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.
Force router to use address for DNS - 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).
After finishing all the settings here, please click OK to save the configuration.
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Vigor2110 Series User's Guide