Cleaning Up Phantom DHCP Leases....

Posted on 2003-02-25
Medium Priority
Last Modified: 2013-12-23

NT Server 4.0, SP5, no option to upgrade to SP6;

I inherited a DHCP server that was originally set up for infinite lease expiration; The DHCP pool began to dry up, events recorded in event manager; I ran Jetpack.exe, to no avail ( waited 4 hours as recommended ).

I was able to obtain a DHCP Manager dump from DHCPCMD.exe -- I thought I could delete the phantom leases via a batch job.  In Win2K server, you can use the "delete lease [IP]" command -- no such options on NT server.......or are there???

Question by:Luke223
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LVL 79

Expert Comment

ID: 8020926
One way to clean it up for sure is to stop the server service, open \WINNT\system32\dhcp and delete all the files and folders there, restart the service and setup the new scope again. Once everyone reboots, you should be starting off with a clean slate.

Author Comment

ID: 8022371
Hmmmm.....good point, lrmoore.  If I delete all files, including the dhcp.mdb, will they be re-created once I re-create the scope and start the service back up?  I must admit it sounds a bit risky on a large LAN, however.....
LVL 79

Accepted Solution

lrmoore earned 400 total points
ID: 8022399
If you have a large lan, perhaps you have another server that is underutilized that you could enable DHCP on. Stop it on the existing one, turn on the new one with the same scope just to handle things in case. Clear the old one, setup the scope, turn off the temp, start the old one. If your leases are longer than the 3day default, nobody should even know.

Author Comment

ID: 8076058
I cleaned up enough entries in our pool to allow us to run until another server is set up -- I will personally ensure this server gets set up properly, in order to avoid problems in the future.  Thanks for your help, guys !!!

Expert Comment

ID: 9158495
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