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Article ID: 000037977
Last Modified Date: 12/10/2021
Access Level: Public

Microsoft DHCP server giving Bad Address in DHCP status log when rebooting or adding Polycom IP phones

Microsoft DHCP server giving “Bad Address” in DHCP status log when rebooting or adding Polycom IP phones The Microsoft DHCP service marks an address as bad when a client (IP Phone) refuses the lease. The reason for this is that Microsoft DHCP service does not check to see if an address is used before giving it out on a new DHCP request. However the phone will send an ARP to see if the address is used already and DECLINE the address if any device responds. To resolve this you will need to enable Conflict Detection in the Advanced Tab. The steps are as follows;
  1. Open DHCP.
  2. In the console tree, click the applicable DHCP server.
  3. On the Action menu, click Properties.
  4. Click the Advanced tab.
  5. For Conflict detection attempts, type a number greater than 0 (zero) and less than six, and then click OK.
The number you type determines how many times the DHCP server tests an IP address before leasing it to a client. All Software Versions