Upgrade Domain COntroller from 2012R2 to 2019 keep same IP - Microsoft Q&A (2024)

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