Draytek Vigor2100V User Manual page 43

Primary IP
Address
Secondary IP
Address
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.
LAN TCP/IP and DHCP Setup
You must specify a DNS server IP address here
because your ISP will at least provide you with at least
one DNS Server IP address. If you do not specify it, the
router will automatically apply default DNS Server IP
address: 194.109.6.66 to this field.
You must specify secondary DNS server IP address
here because your ISP often can let you have at least
one DNS Server IP address. If you do not specify it, the
router will automatically apply default secondary DNS
Server IP address: 194.98.0.1 to this field.
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