Subnet change for PDC, DNS, DHCP. How to do it right?

Question

System administration

Hello, it is necessary to change the network addressing on PDC, DNS and DHCP. PDC, DNS, DHCP are on one machine, but there is still DNS on another machine. Relocation is required from 192.168.1.0/24 to 10.8.121.0/24. How to make a move?

Answer 1

Give the IP address for the DC from the new one additionally - in parallel with the old one.
Do ipconfig /registerdns and make sure that the DNS has a new entry in the forward and reverse zone.
Reconfigure DHCP to issue ip addresses from a new subnet, or (more correctly) issue from a new subnet and, as an additional ip, also from the old one.
Wait for the lifetime of ip addresses in DHCP to pass and remove the remnants of the old 192.168.1.0/24.
Another option is to simply change the DHCP lifetime to a small period of time and simply replace old addresses with new ones everywhere in one operation. Then there will be downtime of some computers for this short period.
But all this is a theoretical description of how it should be. But in practice, the assessment should be carried out by someone who understands what is happening on the local network and what these changes can affect.

Answer 2

Isn't it easier to raise an additional DC in the desired network, after all replications, transfer all roles to it, and after all the checks, downgrade and withdraw the old one. In this case, DNS itself replicates the zone and all settings.