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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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How Do I Prevent a DHCP Server from Allocating an IP Address in Use to Another Client?

How Do I Prevent a DHCP Server from Allocating an IP Address in Use to Another Client?

To prevent a DHCP server from allocating an IP address in use to another client, run the dhcp server ping { packet number | timeout milliseconds } * command in the system view of the DHCP server to set the maximum number of ping packets to be sent and the maximum response time of a ping packet.

If this command is run, the DHCP server sends a ping packet to check whether an IP address is in use before allocating the IP address to a client. If there is no response to the ping packet within the maximum response time specified by milliseconds, the DHCP server continues to send ping packets until the number of sent ping packets reaches the maximum number specified by number. If there is still no response, the DHCP server considers that no device on the local network segment uses the IP address, and allocates the IP address to the client.

The time for the DHCP server to detect whether an IP address is in use should not be too long; otherwise, DHCP clients cannot obtain IP addresses. It is recommended that the configured total detection time (maximum number number of sent ping packets x maximum response time milliseconds of a ping packet) be less than 8 seconds.

Updated: 2020-01-07

Document ID: EDOC1000060766

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