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DHCP Server deletes reservations

  • Article

DHCP Servers in Windows Server 2008 R2 are deleting reservations,   in certain instances, without user intervention.      If two DHCP Servers in split scope configuration are configured with  identifical reservations,  both of these servers may respond to client requests for a lease.   The client accepts a reserved IP address from one of the servers and the other server, automatically (and incorrectly) deletes the reservation on it's server.

 A hot fix is available for this issue.   

 Ajay
Team Networking

Comments

  • Anonymous
    January 01, 2003
    Hi Dominic, Using a down level (lower version) client to manage higher version server is not supported. To manage a Windows Server 2008 R2 DHCP, you will need to use MMC from Windows 7 or Windows Server 2008 R2. Thanks, Prasad Team DHCP

  • Anonymous
    January 01, 2003
    John, I agree that this should not have slipped through. We have now added more QA coverage around reservations. We also continue to look at QA processes in a constant endeavour to improve product quality. Thanks for your feedback. Prasad Team DHCP

  • Anonymous
    January 01, 2003
    Mark, Have you tried packet captures on the DHCP server. You should also look at the DHCP server audit log for messages for a the MAC addresses of the specific IP phone. Thanks, Prasad Team DHCP

  • Anonymous
    January 01, 2003
    I applied the hotfix and reboot the servers last week. It seems that the problem was corrected but something bizarr happen last night after the domain controller windows update was applied and rebooted. The DHCP server lost the router and the lease duration settings in all scopes "20".

  • Anonymous
    January 01, 2003
    There have been no reports of this issue (deletion of reservations) on Windows Server 2008.

  • Anonymous
    January 01, 2003
    http://social.technet.microsoft.com/Forums/en-US/winserverNIS/thread/5f0872d9-ff50-4ce9-a001-d9f7ab8cc4c6/ Above the discussion about the issue! Best regards, Arian van der Pijl!

  • Anonymous
    April 27, 2010
    The comment has been removed

  • Anonymous
    September 09, 2010
    Well I have a similar issue and I am not sure the hotfix wil fix the problem.  I only have the scopes for this server on one server, but I have a user that cannot see the DHCP Reservations.  He has full control of DHCP, and can create a reservation but when he refreshes the reservation disappears.  He is using WinXP with MMC 3.0 and the DHCP server is on a Domain Controller that is running R2.  From my console on Win7 MMC 3.0 I can see all the reservations.

  • Anonymous
    November 01, 2010
    Interesting issue here. We have IP phones from Mitel that work fine with a 2003 DHCP server, but when plugged into our test environment, 2008R2, they fail to obtain an address. If I create a reservation for the phone, then it picks up that address just fine, but won't get an address without a reservation. Any idea how to trouble-shoot this kind of problem?

  • Anonymous
    June 22, 2011
    Mark, Creat a new string > Scope Option Vendor class: ipphone.mitel.com User class: Default User Class 001 Mitel Data Entry String value: id:ipphone.mitel.com;sw_tftp=Mitel server IP;call_srv=Mitel server IP;dscp=46;vlan=Vlan ID;l2p=6

  • Anonymous
    July 25, 2013
    We have faced similar issue with 2008 and not R2, is it also known issue?

  • Anonymous
    June 23, 2014
    I have W2008R2 SP1 and splitscope is deleting reservations. Downloaded the hotfix, but popup says it is not for this computer.