Draytek Vigor2920 Series User Manual page 167

Item
DNS Server
Configuration
After finishing all the settings here, please click OK to save the configuration.
Description
IPs will be used out and then no one will be able to get any IPs
from this server anymore. Therefore, this feature is used to get
the IP back from inactive clients (i.e. doesn't use the IP but the
server still reserves the IP for him).
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.
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 use the DNS server assigned by ISP. If
not, the router will assign its own IP address to local users as a
DNS proxy server.
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).
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Vigor2920 Series User's Guide