Windows Server 2019 DC reboot changes DNS IP address of another DC and replicates it across servers.

Dave Stubbs 1 Reputation point
2021-07-10T14:26:51.837+00:00

I'm struggling to find the cause of this problem, or even an error in the logs to point me at where to start as most errors derive from the result, not the cause.

I've had a single server for some time called CRONUS, IP 10.0.0.151 and as part of an upgrade I've added a second server CRONUS2 with IP 10.0.0.150.

I've added CRONUS2 to the same domain, forest etc and transferred all roles to CRONUS2 with a view to eventually shutting down CRONUS.

But whenever I reboot CRONUS2 it updates the DNS entry of CRONUS 10.0.0.150 (CRONUS2 IP address) causing all of the replication to fail, etc. etc. as you'd expect.

I can't figure out why the CRONUS2 machine should be updating the IP address of CRONUS when it boots. I know it should do its own, but what would make it change the IP address of another host name?

CRONUS still runs and is using IP 10.0.0.151 on its adaptor, and none of the adaptors have multiple IP addresses.

I tried changing the IP of CRONUS2 to 10.0.0.152 and rebooting and it did exactly the same but using that IP address instead.

Windows Server 2019
Windows Server 2019
A Microsoft server operating system that supports enterprise-level management updated to data storage.
3,437 questions
Windows DHCP
Windows DHCP
Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.DHCP: Dynamic Host Configuration Protocol (DHCP). A communications protocol that lets network administrators manage centrally and automate the assignment of Internet Protocol (IP) addresses in an organization's network.
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3 answers

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  1. Dave Patrick 426K Reputation points MVP
    2021-07-10T14:32:59.917+00:00

    Please run;

    Dcdiag /v /c /d /e /s:%computername% >C:\dcdiag.log
    repadmin /showrepl >C:\repl.txt
    ipconfig /all > C:\dc1.txt
    ipconfig /all > C:\dc2.txt

    then put unzipped text files up on OneDrive and share a link.

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  2. Fan Fan 15,291 Reputation points Microsoft Vendor
    2021-07-12T01:40:45.3+00:00

    Hi,
    Welcome to share here!
    Did you assign the static IP address manually? Or By the DHCP server?
    113671-7121.jpg

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  3. Dave Patrick 426K Reputation points MVP
    2021-07-15T12:32:56.117+00:00

    Just checking if there's any progress or updates?

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

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