Enabling IP Address Conflict Detection

Enabling IP address conflict detection allows the NetEngine 8000 F that functions as a DHCPv4 server to send ping packets to detect IP address conflicts.

Context

Before assigning an IP address to a client, the DHCPv4 server needs to detect whether the IP address is used by another client. This prevents an IP address conflict.

IP address conflict detection can be configured on only network-side devices.

Procedure

Run system-view
The system view is displayed.
Run dhcp server ping timeout milliseconds
The longest time for the DHCPv4 server to wait for a ping response is configured.
Run dhcp server ping packets packet-number
The maximum number of ping packets sent by the DHCPv4 server is configured.
Run commit
The configuration is committed.

Follow-up Procedure

The ping command is used to check whether there is a ping response from the IP address to be assigned to a client within a specific time. If there is no response after a specific time, the DHCPv4 server re-sends a ping packet to this IP address until the allowed maximum number of ping packets are sent. If there is still no response, the DHCPv4 server considers that the IP address is not in use. This ensures that a unique IP address is assigned to the client.