HP VPN Firewall Appliances Network Management Configuration Guide

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Figure 114 DHCP relay agent configuration page

4. Configure advanced parameters for the DHCP relay agent as described in Table 26.

5. Click Apply.

Table 26 Configuration items

Item Descri

tion

DHCP Service Enable or disable global DHCP.

Unauthorized Server

Detect

Enable or disable unauthorized DHCP server detection.

There are unauthorized DHCP servers on networks, which reply DHCP clients with

wrong IP addresses.

With this feature enabled, the DHCP relay agent checks whether a request contains

Option 54 (Server Identifier Option). If it does, the DHCP relay agent records in the

option the IP address of the DHCP server that assigned an IP address to the client and

records the receiving interface. The administrator can use this information to check

for unauthorized DHCP servers.

With the unauthorized DHCP server detection enabled, the device records all

detected DHCP servers (including authorized DHCP servers) and saves one record

for each server. The administrator needs to find unauthorized DHCP servers from the

log information.