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Issue with DHCP scopes

    Question

  • A couple of weeks back i installed a new RODC (Windows 2008 R2) in our environment which is going to replace the exisiting ADC running on Windows 2003 R2. After configuring RODC and bringing it online i had two DCs altogether, the old ADC which was planned to be demoted yesterday hence had kept it running (due to change requests, approvals etc, etc.) and the new RODC. Two days back i changed the DHCP option 006 on all the scope with new DNS server IP. And today i brought the Old ADC down (completely demoted it). After this i have end up in a peculiar problem as all the DHCP clients have started behaving weirdly. IPs are not getting renewed and the total connectivity is down. In DHCP the scopes have failed and show deactivated mark on them.

    Had a hard time assigning static IP to all the clients today. But need to bring back the DHCP back by Monday morning. How do i go ahead and the very important question is, why this all happened at first place.

    Appreciate your responses.


    Best Regards, Jawad Qazi http://about.me/jawad.qazi




    • Edited by JawadQazi Friday, November 23, 2012 6:42 PM
    Friday, November 23, 2012 6:38 PM

Answers

  • Clients will renew their IPs if they exceeded the DHCP lease. If you are using a DHCP relay agent, it should relay the DHCP traffic to the correct DHCP server: If you changed the DHCP server IP address then you will need to update also your DHCP relay agents configuration.

    Please also try to reboot the server and, if it is a Windows DHCP server it should be authorized from a DC to be able to give IP addresses to your client.

    How to authorize a DHCP server: http://technet.microsoft.com/en-us/library/cc759688(v=ws.10).aspx


    This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

    Sunday, November 25, 2012 7:46 PM

All replies

  • what steps you took while changing the DHCP option 006 ?

    have you deactivated the scope and then changed the options ?

    Please check below link if it helps to you.

    http://social.technet.microsoft.com/Forums/en/winservergen/thread/b4818af5-030c-41f1-8c0f-a239bae1484d

    HTH.


    Thanks & Regards,
    Amit Katkar (MCTS)
    ------------------------------------------------------------
    This posting is provided "AS IS" with no warranties or guarantees and confers no rights.

    Friday, November 23, 2012 7:06 PM
  • Thanks for the reply Amit, i just went with the normal procedure of changing the DNS server IP in the Scope Options without deactivating any scopes. Also one point i would like to make here is the lease period confiured on the DHCP is 5 days.

    Best Regards, Jawad Qazi http://about.me/jawad.qazi

    Friday, November 23, 2012 7:15 PM
  • IP on client is not renewed even after run ipconfig /renew? Client will attempt to renew the same used Ip, its not guarantee.  Run ipconfig /all on client, is DNS value changed to the new DNS Server?

    Saturday, November 24, 2012 1:17 PM
    Moderator
  • Clients will renew their IPs if they exceeded the DHCP lease. If you are using a DHCP relay agent, it should relay the DHCP traffic to the correct DHCP server: If you changed the DHCP server IP address then you will need to update also your DHCP relay agents configuration.

    Please also try to reboot the server and, if it is a Windows DHCP server it should be authorized from a DC to be able to give IP addresses to your client.

    How to authorize a DHCP server: http://technet.microsoft.com/en-us/library/cc759688(v=ws.10).aspx


    This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

    Sunday, November 25, 2012 7:46 PM