Configuring IP address conflict detection

Before assigning an IP address, the DHCP server pings that IP address.

• If the server receives a response within the specified period, it selects and pings another IP address.

• If it receives no response, the server continues to ping the IP address until the maximum number of ping packets are sent. If still no response is received, the server assigns the IP address to the requesting client. The DHCP client uses gratuitous ARP to perform IP address conflict detection.

1. Enter system view.

   system-view

2. (Optional.) Set the maximum number of ping packets to be sent for conflict detection.

   dhcp server ping packets number

   The default setting is one.

   To disable IP address conflict detection, set the value to 0.

3. (Optional.) Set the ping timeout time.

   dhcp server ping timeout milliseconds

   The default setting is 500 ms.

   To disable IP address conflict detection, set the value to 0.