DHCP Server Cleanup

Posted on 2007-10-15
Last Modified: 2013-12-05
Is there a way to clean up any IP addresses that are issued but not being used by a computer in Windows 2000 Server.
Question by:al4629740
    LVL 70

    Expert Comment

    What lease time have you set?
    Unused IP addresses will be released for re-use once the lease has expired.
    You can make the lease time shorter if required.
    LVL 4

    Expert Comment


    Your DHCP server can be configured for lease IP configuration (not only addresses) for a established time. In the middle of this time, the client try to renew his configuration, and obtain 1/2 leased time minimun (up to new renew).
    You should bminimize this time if you have a lot of RRAS connections or you have your subnet suturated, and you can increase this time if you have static PC connecting every day to the LAN.
    In few words: try some times for obtain the best ratio of released configurations and get a stable lan with DHCP (don't lease time for 5 minutes -for example-). If after that, you don't have sufficient IP free, then you need to think in change your IP topology: increase your netmask can be a good sollution.

    LVL 4

    Accepted Solution

    Hello again,

    In order to put ideas in order:

    You can delete all entries of dhcp leases if yo are sure the pc is now off line, because dhcp is "only" a database of free IP address. Then you can generate "duplicate IP address" in your lan.
    The best way is wait until dhscp service cleans automatically leases entries.

    Don't hesistate contact again.


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