HP X Unified Security Platform Series Bedienungsanleitung PDF herunterladen (Seite 187)

DHCP Server

X Family LSM User’s Guide V 2.5.1 171

DHCP Relay

DHCP Relay allows DHCP to operate between a DHCP client on one security zone and a DHCP server

on another. To use DHCP relay, you configure the device to act as a DHCP relay agent. The device will

relay DHCP packets to the destination DHCP server and back to the client across security zone

boundaries. This enables DHCP clients on different networks to use the same DHCP server.

You can configure the device to act as a central or remote relay agent as illustrated in the following

figure:

•A Central Relay agent is connected to the network that contains the DHCP server. It receives

requests from a remote agent and forwards them to the DHCP server on its LAN. You can configure

this option to work over VPN so that the device allows a DHCP server at one site to provide IP

configuration to clients attached to a remote LAN. In this configuration, the device acts as a DHCP

Relay agent and supports DHCP over VPN tunnels using IKE.

•A Remote DHCP Relay Agent is connected to a client network that requests a DHCP lease. It listens

for DHCP requests from its LAN. When a client request is received, the agent inserts the Interface IP

of the requestor into the DHCP request before it is relayed to the central DHCP server. This address,

which is not contained in a DHCP address range, determines the scope of addresses used by the

central DHCP server to allocate the address to the remote client.

Note To use DHCP Relay, you must disable the DHCP Server. See “Disable the

DHCP Server” on page 170 for more information.

Figure 6–14: DHCP Relay: Device Configuration for Central and Remote Agent

Note For more detailed information on how DHCP Relay works, see the

Concepts Guide.

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HP X Unified Security Platform Series Bedienungsanleitung Seite 187