Using DHCPCMD to Modify a Reservation Converts It to a Lease

ID: Q198541

The information in this article applies to:

Microsoft Windows NT Server version 4.0
Microsoft Windows NT Server, Enterprise Edition version 4.0

SYMPTOMS

When you use the DHCPCMD command ADDRESERVEDIP to modify an existing reservation, error 20022 (ERROR_DHCP_RESERVEDIP_EXISTS) is returned. When you subsequently inspect the reservation using DHCP ADMIN, the reservation has been turned into an active lease. If DHCPCMD is run again to modify the lease, it works correctly and is turned back into a reservation.

CAUSE

This is a problem in DHCP server, which incorrectly handles the modification of an existing reservation, causing the reservation to be partially deleted. This results in the remaining data looking like an active lease.

Running the same command again causes the reservation to be correctly re- added.

RESOLUTION

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:

http://www.microsoft.com/Windows/ServicePacks/

Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack

For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

STATUS

Microsoft has confirmed this to be a problem in Windows NT version 4.0. This problem was first corrected in Windows NT version 4.0 Service Pack 5.

Additional query words: 4.00 dhcpadmn tcpip

Keywords : kbbug4.00 kbfix4.00 nt4sp5fix
Version : winnt:4.0
Platform : winnt
Issue type : kbbug