Motorola Router 6161252-00-01 ユーザーズマニュアル

The Motorola Netopia® Embedded Software Version 8.7.4 offers DHCP Relay Agent functionality, as defined in 
RFC1542. A DHCP relay agent is a computer system or a gateway that is configured to for ward DHCP requests 
from clients on the LAN to a remote DHCP ser ver, and to pass the replies back to the requesting client 
systems. 

When a DHCP client star ts up, it has no IP address, nor does it know the IP address of a DHCP ser ver. 
Therefore, it uses an IP broadcast to communicate with one or more DHCP ser vers. These broadcasts are 
normally limited to the network segment on which the client is located, and do not pass through gateways such 
as the Motorola Netopia

®

 Router. If the Motorola Netopia

®

 Router is configured to act as a DHCP ser ver, it will 

assign the client an address from an address pool configured locally in the Motorola Netopia

®

 Router and 

respond to the client's request itself.

However, if the Motorola Netopia

®

 Router is configured to act as a DHCP relay agent, it does not satisfy the 

DHCP request itself, but instead for wards the request to one or more remote DHCP ser vers. These ser vers 
process the request, assign an address from an address pool configured on the remote ser ver, and for ward the 
response back to the Motorola Netopia

®

 Router for deliver y back to the client. The agent then sends the 

response to the client on behalf of the DHCP ser ver. This process is transparent to the client, which doesn't 
know that it is communicating through an intermediar y rather than directly to a local ser ver. Using DHCP relay, 
it is possible to centralize the configuration information for the host computers at many remote sites at a single 
location, easing the burden of administering configuration management for remote sites.

To configure the Motorola Netopia

®

 Router to act as a DHCP relay agent, from the Main Menu navigate to the 

System Configuration menu.

                              Served IP Addresses

 -IP Address------Type----Expires--Host Name/Client Identifier-----------------
 ----------------------------------SCROLL UP-----------------------------------
 192.168.1.1      Excluded for the gateway's IP address
 192.168.1.2      Excluded
 192.168.1.3      DHCP    00:24    Barr's XPi 120
 192.168.1.4
 192.168.1.5
 192.168.1.6
 192.168.1.7
 192.168.1.8
 192.168.1.9
 192.168.1.10
 192.168.1.11
 192.168.1.12
 192.168.1.13
 192.168.1.14
 ---------------------------------SCROLL DOWN----------------------------------
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