Draytek Vigor2912 User Manual page 159

Relay Agent is checked. 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.
Start IP Address - Enter a value of the IP address pool for
the DHCP server to start with when issuing IP addresses. If
the 1st IP address of your router is 192.168.1.1, the starting
IP address must be 192.168.1.2 or greater, but smaller than
192.168.1.254.
IP Pool Counts - Enter the maximum number of PCs that
you want the DHCP server to assign IP addresses to. The
default is 50 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.
Lease Time - Enter the time to determine how long the IP
address assigned by DHCP server can be used.
Clear DHCP lease for inactive clients periodically -
Whenever a DHCP client requests an IP address from the
LAN DHCP server, the server will give out an IP to this
client for a certain amount of time (e.g., 1 day). However,
even if this client only uses the IP for say 5 minutes, the
server still "reserves" 1 day for that client. Because a DHCP
server only has a limited number of IPs to lease to its
DHCP clients, soon enough all the 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 Server IP Address 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:
Vigor2912 Series User's Guide
149