Enabling unauthorized DHCP server detection
Unauthorized DHCP servers may assign wrong IP addresses to DHCP clients.
With unauthorized DHCP servers detection enabled, the DHCP relay agent checks whether a request contains Option 54 (Server Identifier Option). If yes, the DHCP relay agent records the IP address of each detected DHCP server that assigned an IP address to a requesting DHCP client in the option, and records the receiving interface. The administrator can use this information to check for unauthorized DHCP servers.
The relay agent logs a DHCP server only once.
To enable unauthorized DHCP server detection:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enable unauthorized DHCP server detection. | dhcp relay server-detect | Disabled by default |