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Thread: Domain Controller Multiple NIC DNS problem

  1. #1
    Join Date
    Oct 2005
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    190

    Domain Controller Multiple NIC DNS problem

    I am on a domain controller with 2 ip address. It usually adds both og them automatically to DNS. Can anyone tell me whether there is any way that will let me select which one of these ip address should be added into DNS and prevent the other one to be added automatically? Thanks

  2. #2
    Join Date
    Sep 2005
    Posts
    179
    You can try to enable or disable DNS updates in Windows 2000 and in Windows Server 2003, just follow the steps given here - http://support.microsoft.com/?id=246804

  3. #3
    Join Date
    Sep 2009
    Posts
    1

    Re: Domain Controller Multiple NIC DNS problem

    Hello . I have read the responses , but find the solutions rather confusing.
    In my case, the second NIC card in my Win2003 DC , DNS, & DHCP server is connected to a switch dedicated for Internal Backup purposes only and with another IP subnet 192.168.x.x.
    It has File and Print, MS Client, DNS and Netbios all disabled.
    Yet when I Enable the secondary card, after a short while, the secondary DNS IP number is propogated thruout the primary card network and my users begin to experience connection errors.
    Is there a simple solution to this?
    Thanks for any advice or suggestions, I am at my wits end with this...

  4. #4
    Join Date
    Nov 2005
    Posts
    344

    Re: Domain Controller Multiple NIC DNS problem

    I have checked the NIC binding order with the protocols help but thats not the case for 100% of the problem. MS wouldnt suggest having a DC to be multihomed, that is, having multiple NICs in the DC connected. You can plan on changing that in the neat future rather than fixing the symtoms.

  5. #5
    Join Date
    Sep 2009
    Posts
    1
    This is very interesting info. Where can I find your step-by-step?

    What if a virtual multihomed DC is deployed and configured with a single virtual nic and a second virtual NIC is installed/configured in the last step of the installation/configuration process? Anyone has experience with this?

  6. #6
    Join Date
    Dec 2005
    Posts
    946
    Usually a multi-homed DC is a multihomed DC, whether physical or virtual is not relevant, it is still the same thing. Check the article below for more information:

    Active Directory Communication Fails on Multihomed Domain Controllers
    http://support.microsoft.com/default...b;en-us;272294

    Symptoms of Multihomed Browsers
    http://support.microsoft.com/default...b;EN-US;191611

  7. #7
    Join Date
    Dec 2009
    Posts
    2

    Re: Domain Controller Multiple NIC DNS problem

    I accidentally multihomed my DC by plugging the network cable into the wrong NIC, I don't want it to be multihomed and have plugged the network cable into the correct NIC. Can this write up be adapted to remove the binding to the second NIC?

    Every time i delete it in the DNS (which is also on the DC) it reappears each time it reloads.

    Cheers guys this might just save my bacon

  8. #8
    Join Date
    Feb 2006
    Posts
    335

    Re: Domain Controller Multiple NIC DNS problem

    You can try to disable the unused NIC in networking section. Or, it will still try to register even with any ip address. If it is disabled then Windows ignores it.

  9. #9
    Join Date
    Dec 2009
    Posts
    2

    Re: Domain Controller Multiple NIC DNS problem

    Thank you so much, that has done the trick, DNS back up to full speed.

  10. #10
    Join Date
    Aug 2010
    Posts
    1

    Re: Domain Controller Multiple NIC DNS problem

    Guys,
    I know this was the case in DC's running WIN 2000 and 2003.
    Was it resolved in later versions of active directory?
    Does 2008 R2 for example display the same issue with the don't multihome rules?
    Rgds
    Steve P

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