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Chapter 4: System Management Efficient Networks
®
Router family
Technical Reference Guide
Page 4-2 Efficient Networks
®
DHCP (Dynamic Host Configuration Protocol)
The router supports DHCP and can act as the DHCP server. (The router’s DHCP
server disables itself if it locates other active DHCP servers on the network or if a
DHCP server on the WAN has been explicitly specified.)
When configured, the router can provide DHCP functions as follows:
• As a server, IP addresses are assigned to workstations attached to the LAN
that issue DHCP address requests.
• As a client, the router requests that an IP address be assigned to the WAN
side port of the router.
• As a relay, the router passes through client requests from the LAN side onto
the WAN asking for IP address assignment and relays responses back to the
appropriate client.
This section describes how to configure DHCP. The procedures that follow illustrate
the process using the Command Line Interface; to configure DHCP via the WMI, use
the DCHP Configuration page (page 8-35). Configuring DHCP can be a complex
process; this section is therefore intended for network managers. For a complete list
and explanation of the DHCP commands, refer to the Command Line Interface Guide:
Chapter 8, DHCP Commands.
NOTE:
Some DHCP values can be set using the Windows Quick Start application, the
Windows Configuration Manager, or the web-based EZ Setup application.
DHCP Address Allocation
DHCP is a service that allocates IP addresses automatically to any DHCP client
requesting an IP address. (A DHCP client can be any device attached to your
network, for example, a PC.) It can also provide option values (such as the subnet
mask, DNS, and gateway values) automatically.
Using DHCP to automatically acquire initialization parameters translates into avoiding
the more involved router/PC manual initialization process. (The manual initialization
requires re-configuration of router and/or PC addresses to be in the same network.)
To configure DHCP for a network, the network administrator defines a range of valid
IP addresses to be used in the subnetwork as well as options and other parameters.
This process is described in the next section, DHCP Administration and
Configuration.
NOTE:
DHCP is effective only if the TCP/IP stack is installed on the PCs.