3Com Switch 7750 Configuration Guide

610 CHAPTER 57: DHCP SERVER CONFIGURATION
Solution
■ Disconnect the DHCP client from the network and then check whether there is
a host using the conflicting IP address by performing ping operation on
another host on the network, with the conflicting IP address as the destination
and an enough timeout time.
■ The IP address is manually configured on a host if you receive a response
packet of the ping operation. You can then disable the IP address from being
dynamically assigned by using the dhcp server forbidden-ip command on
the DHCP server.
■ Attach the DHCP client to the network, release the dynamically assigned IP
address and obtain an IP address again. For example, enter DOS by executing
the cmd command in Windows XP, and then release the IP address by
executing the ipconfig/release command. Then obtain an IP address again by
executing the ipconfig/renew command.