_:n5d205736d85f4ccf8913d057aad5b9a3xb3
<http://schema.org/text>
"1. After all old DCs are gone.\n2. Yes. New VMs.\n3. Yes, you can put re-use the IP address on a replacement DC. I always do.\n4. Doesn't matter, but I would look st eliminating child domain.\n5. Doesn't really matter, but both child DCs should have DNS and GC IMHO. \n\nDetails on 3. Setup new DC on temporary IP. Have DNS and DHCP on it and properly configured.\n\nTo cut over, take old FC and put it on a new IP. Take new DC and give it the permanent IP and then reboot it.\n\nYou're switched over. Check to be sure things are okay. You can now demote old DC at your leisure. If something isn't working right, you can always switch IPs again so that the original DC gets its original IP.\n"
<https://community.spiceworks.com/topic/2256431-upgrading-2008r2-2012r2-domain-controllers-to-2016>