HP VPN Firewall Appliances Network Management Configuration Guide

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Configuring the DHCP relay agent
The DHCP relay agent configuration is supported only on Layer 3 Ethernet interfaces (or subinterfaces),
virtual Ethernet interfaces (or subinterfaces), VLAN interfaces, and Layer 3 aggregate interfaces.
Overview
The DHCP relay agent enables clients to get IP addresses from a DHCP server on another subnet. This
feature avoids deploying a DHCP server for each subnet, centralizes management, and reduces
investment.
Fundamentals
Figure 112 shows a typical application of the DHCP relay agent.
Figure 112 DHCP relay agent application
The DHCP server and client interact with each other in the same way regardless of whether the relay
agent exists (see "DHCP overview").
Figure 113 DHCP relay agent work process