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Hidden DHCP addresses RRS feed

  • Question

  • Dear all

    I am running split DHCP scopes on two windows server 2012 R2 servers. One of the DHCP server has 400 total addresses for distribution.

    In use addresses - 200 , Available - 100 so total 300 addresses are in the use but my scope is 400 and somewhere 100 hidden addresses are in use.

    How do I find this.

    Many thanks

    Wednesday, March 1, 2017 2:38 PM

Answers

  • Hi,

    Can you run Angry IP Scanner and check if it will find something.

    Can you run a reconcile on the scope as well to see if it will find issues.

    • Marked as answer by Ms-2010 Wednesday, March 1, 2017 4:14 PM
    Wednesday, March 1, 2017 3:36 PM
  • Hi,

    Have you tried reconciling the DHCP scopes which performs a consistency check against the database?  This can free up what appear to be hidden IPs.

    • Marked as answer by Ms-2010 Wednesday, March 1, 2017 4:14 PM
    Wednesday, March 1, 2017 3:43 PM

All replies

  • Hi,

    How you are checking the utilization? What is the free addresses available in statistics?

    To get the statistics got the Action menu, click Display Statistics

    Lets us know  your findings.


    Regards,
    Rafic

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    Wednesday, March 1, 2017 2:47 PM
  • Hi,

    I have account lease addresses in the DHCP scope which is 200 but in the statics ( Action menu -Display Statistics ) use addresses are 300. But I cant see these 100 hidden addresses.

    Wednesday, March 1, 2017 3:14 PM
  • Hi,

    Can you run Angry IP Scanner and check if it will find something.

    Can you run a reconcile on the scope as well to see if it will find issues.

    • Marked as answer by Ms-2010 Wednesday, March 1, 2017 4:14 PM
    Wednesday, March 1, 2017 3:36 PM
  • Hi,

    Have you tried reconciling the DHCP scopes which performs a consistency check against the database?  This can free up what appear to be hidden IPs.

    • Marked as answer by Ms-2010 Wednesday, March 1, 2017 4:14 PM
    Wednesday, March 1, 2017 3:43 PM
  • Hi,

    Can I try  reconciling the DHCP scopes while end devices are connected?

    Thanks

    Wednesday, March 1, 2017 4:03 PM
  • Hi,

    Done the reconciling the DHCP scopes and the database is consistent. But still quite a lot hidden ips.

    Thanks

    Wednesday, March 1, 2017 5:08 PM
  • Hi,

    When you reconcile, are the hidden IPs showing up with the IP address in the Client IP column and the same address in the Name column?   If so, we sometimes get this on our servers and I just delete them to free up the IPs. I've researched a fix for long time but have been unsuccessful.


    Thursday, March 2, 2017 7:54 AM
  • Hi,

    >>One of the DHCP server has 400 total addresses for distribution.

    How many of addresses did you configure on another DHCP server?

    Could you please provide details result of netsh dhcp server show mibinfo command to here?

    Best Regards

    John


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    Thursday, March 2, 2017 8:24 AM
  • Dear John,

    Another DHCP server have 600 addresses. Attached  netsh dhcp server show mibinfo command result.

    Thursday, March 2, 2017 12:25 PM
  • Hi,

    Have you create backup for DHCP database?

    Please try to restore DHCP database and check again.

    Best Regards

    John


    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Friday, March 3, 2017 9:27 AM