Upgrade Domain COntroller from 2012R2 to 2019 keep same IP

Aseman Kavir 21 Reputation points
2021-10-01T19:47:05.08+00:00

Hi ,

I have DCs across 6 sites, All DCs are 2012R2 and we need to upgrade them to 2019. For first DC in Domain which is the main DC and has all FSMO roles on it and also DHCP , I want to upgrade it but keep the same IP , this way I don`t need to update DNS IP across all Servers and devices. ( it will be hard to capture all devices and you might miss those have static DNS on them )

Each site has 2 DC for failover and DHCP and DNS on them

1.What is the best path to upgrade DCs with same IP ?
2. I also want to move DHCP to separate server while I am performing this upgrade, the DHCP IP will change. is there any thing I need to be concerned about other than DHCP Relay and shortening the lease of IPs ?

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Accepted answer
  1. cthivierge 4,056 Reputation points
    2021-10-01T20:42:13.727+00:00

    Hi,

    To change the IP of a Domain Controller.

    Change IP address of the DC and then run ipconfig /registerdns and restart netlogon on it.

    Here is the steps i would suggest you...

    1. Assign a temporary IP Address to the new DC (Still a member server at that time)
    2. Promote the new DC
    3. Assign a Temporary IP Address to the old DC (the schema update will be done at the same time)
    4. On the old DC, run ipconfig /registerdns and restart the Netlogon service
    5. Assign the IP Address of the old DC to the new DC
    6. On the new DC, run ipconfig /registerdns and restart the Netlogon service
    7. Transfer the FSMO roles to the new DC
    8. You can wait few days just to be sure that everything is ok before removing old DC's

    Repeat the steps 1 to 6 for all new DC's

    For the DHCP, you mentioned that you want to move the DHCP on another server (other than the DC's)
    Prerequisites: DHCP Relay for sure also if you have IPHelper configuration in your main switch, you must ensure the new DHCP Servers are listed

    1. Backup the DHCP Server
    2. This can be done using a simple netsh command --> export c:\temp\dhcpdb_DC1 all
    3. Stop the DHCP Service on the Old DC
    4. On the new DHCP Server, install DHCP Role and authorize it but do not configure it
    5. Import the DHCP Backup using netsh command --> import c:\temp\dhcpdb_DC1 all

    Repeat steps 1 to 5 for all DHCP Server

    As a prerequisite for Domain migration, be sure that the SYSVOL has been migrated to DFSR
    https://techcommunity.microsoft.com/t5/storage-at-microsoft/streamlined-migration-of-frs-to-dfsr-sysvol/ba-p/425405

    hth

    1 person found this answer helpful.

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  1. Muthu Kumar 1 Reputation point
    2022-11-11T11:27:58.723+00:00

    Thanks for the great article. How about dns server migraton. can we create a seconaday zone then migrate it ?

    any other ms article

    Regards
    Muthu

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