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User Manual
4-4 DHCP Relay
The section describes how to forward DHCP requests to another specific DHCP server via
DHCP relay. The DHCP servers may be on another network.
4-4.1 Configuration
This section describes how to configure DHCP Relay setting including：
Relay Mode (Enabled and Disabled)
Relay Server IP setting
Relay Information Mode (Enabled and Disabled)
Relay Information Mode Policy (Replace, Keep and Drop)
Web Interface
To configure a DHCP Relay in the web interface:
1. Select "Enabled" in the Relay Mode of DHCP Relay Configuration.
2. Specify Relay Server IP address.
3. Select "Enabled" in the Relay Information Mode of DHCP Relay
Configuration.
4. Specify Relay (Replace, Keep and Drop) in the Relay Information
Mode of DHCP Relay Configuration.
5. Click Save.
Figure 4-4.1: The DHCP Relay Statistics
Parameter description:
Relay Mode :
Indicates the DHCP relay mode operation. Possible modes are:
Enabled: Enable DHCP relay mode operation. When DHCP relay mode operation is
enabled, the agent forwards and transfers DHCP messages between the clients and the
server when they are not in the same subnet domain. And the DHCP broadcast message
won't be flooded for security considerations.
Disabled: Disable DHCP relay mode operation.
Relay Server :
Indicates the DHCP relay server IP address. A DHCP relay agent is used to forward and to
transfer DHCP messages between the clients and the server when they are not in the
same subnet domain.
Relay Information Mode :
Indicates the DHCP relay information mode option operation. Possible modes are:
Enabled: Enable DHCP relay information mode operation. When DHCP relay information
mode operation is enabled, the agent inserts specific information (option 82) into a DHCP
message when forwarding to DHCP server and removes it from a DHCP message when
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Publication date: Feb., 2013
Revision A3
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