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Dc serving multiple isolted networks

Alex Kleeorin 61 Reputation points
2021-05-20T19:29:33.247+00:00

Hello fellow sysadmins.

Today i saw a really weird setup for one of our clients. He has and AD environment that consists of a single DC. The DC has 3 NICS, each NIC is in a different isolated network. All the DC address are registered in DNS.
Now my instincts tell that this setup is flawed and has a potential for a lot of problems, DNS for instance, you cant control what IP for DC you will get form the DNS.
But practically i haven't been able to receive a "wrong" DNS answer for any specific network. And it does work somehow.

I tried to search on the Internet for any reference for this kind of setup or any official Microsoft commendations. But didnt find anything like that.

Active Directory
Active Directory
A set of directory-based technologies included in Windows Server.
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  1. Anonymous
    2021-05-20T19:33:22.717+00:00

    Yes, that's correct. Multihoming a domain controller will always cause no end to grief for active directory DNS. Better option is to configure the routes on layer three hardware.

    --please don't forget to Accept as answer if the reply is helpful--

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  1. Daisy Zhou 32,421 Reputation points Microsoft External Staff
    2021-05-21T01:52:35.75+00:00

    Hello @Alex Kleeorin ,

    Thank you for posting here.

    Here is a good reference for this kind of setup.

    Multihomed DCs with DNS, RRAS, and/or PPPoE adapters
    https://blogs.msmvps.com/acefekay/2009/08/17/multihomed-dcs-with-dns-rras-and-or-pppoe-adapters/

    And here is a similar case for your reference.

    multiple NICs on the same DC
    https://social.technet.microsoft.com/Forums/windowsserver/en-US/5ad27745-29de-4072-be9a-6e3fa398f85f/multiple-nics-on-the-same-dc?forum=winserverDS

    In summary, to insure everything works, stick with one NIC.

    Hope the information above is helpful.

    Should you have any question or concern, please feel free to let us know.

    Best Regards,
    Daisy Zhou

    ============================================

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  2. Anonymous
    2021-05-27T12:36:28.33+00:00

    Just checking if there's any progress or updates?

    --please don't forget to Accept as answer if the reply is helpful--

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  3. Alex Kleeorin 61 Reputation points
    2021-06-02T19:59:43.183+00:00

    Thank for the help, and sorry for the delayed response. Been drowning in work.

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