ATL Telecom AM30 - Manual (Page 53)

ATL Telecom User Guide
AM30
5
3
Configuring DHCP Server
Note
Before you begin, be sure to configure your PCs to accept
DHCP information assigned by a DHCP server. For detailed
instructions, see the Quick Start chapter, “Part 2 —
Configuring Your Computers.”
To set up DHCP server, you first define the ranges of IP addresses that you want to be
distributed to your PCs, called DHCP server address pools.
Guidelines for creating DHCP server address pools
IP address pools can contain multiple public addresses that you have purchased from your
ISP, but are typically private addresses that you create. LAN administrators often create
private IP addresses for use only on their networks. See “Overview of NAT” on page 61 for
an explanation of private IP addresses.
You can create up to two pools. The pools can maintain a combined total of 254 IP
addresses. For example, you could 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) and a USB-connected computer, as long as these ports are in the same
subnet. You may want to create a second pool if any of these circumstances apply:
fThe device’s Ethernet (eth-0) and USB (usb-0) ports
are in different subnets (note that different subnets
are not required). See Appendix 0 for an explanation
of subnets.
fYour LAN configuration includes two subnets.
fYou 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 57.)
The DHCP server will distribute addresses to 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 and USB interfaces are 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
USB interface (usb-0): IP address 192.168.2.1
mask 255.255.255.0