Draytek Vigor2830 Series User Manual page 123

DHCP Server
Configuration
DNS Server
Configuration
Subnet Mask - Type in an address code that determines the
size of the network. (Default: 255.255.255.0/ 24)
DHCP stands for Dynamic Host Configuration Protocol.
The router by factory default acts a DHCP server for your
network so it automatically dispatch related IP settings to
any local user configured as a DHCP client. It is highly
recommended that you leave the router enabled as a DHCP
server if you do not have a DHCP server for your network.
If you want to use another DHCP server in the network
other than the Vigor Router's, you can let Relay Agent help
you to redirect the DHCP request to the specified location.
Enable Server - Let the router assign IP address to every
host in the LAN.
Disable Server – Let you manually assign IP address to
every host in the LAN.
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.
Retrieve IPs from 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 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
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Vigor2830 Series User's Guide