4-Port ADSL Router User Manual

Configuring Dynamic Host Configuration Protocol
46
You can create up to two pools. The pools can maintain
a combined total of 254 IP addresses. For example, you can
configure only one pool with addresses in the range 192.168.1.2
through 192.168.1.255, or two pools with the following address
ranges:
Pool 0: 192.168.1.2 through 192.168.1.128
Pool 1: 192.168.1.129 through 192.168.1.255
The same pool can be used for distributing IP addresses to your
LAN PCs (connected via the Ethernet port), as long as these ports
are in the same subnet. You may want to create a second pool
if any of these circumstances apply:
•
Your LAN configuration includes two subnets.
•
You have only one subnet, but the addresses you want
to distribute are not in a continuous range. (Alternatively,
you can exclude particular addresses from distribution from
a single pool; see page 50.)
The DHCP server will distribute addresses to the computers
connected to a given device interface only when that interface
is in the same subnet as the pool addresses. For example, assume
that the Ethernet interface is assigned IP addresses that place them
in two different subnets, as shown:
Ethernet interface (eth-0): IP address 192.168.1.1
mask 255.255.255.0
With this configuration, you could create the following two pools:
Pool 0: 192.168.1.2 through 192.168.1.11
Pool 1: 192.168.2.2 through 192.168.2.2
The DHCP server would automatically distribute the Pool 0
addresses only to computers connected to the interface in the
same subnet as these addresses-the LAN interface, eth-0.