What is the procedure for changing IP addressing in a domain?

Question

Domain Name System

Good afternoon! There was a need to change the existing network 192.168.0.0/16 to 10.0.0.0/8
We have two domain controllers, DC1 on Windows Server 2016 and DC2 on Windows Server 2008. DNS on each of them, DHCP on DC1.
DHCP issues addresses from a reservation list.
I imagined it simply - on each DC, register the network 10.0.0.0 with the second address, create a new area 10.0.0.0 and, in my understanding, addresses from the new network should have started to be issued. But the reality is that addresses are not being issued, and judging by the absence of any information in the DHCP logs, the test machine simply cannot reach the DHCP server.
Please help me what else I forgot to do or did wrong

Answer 1

If the test machine is manually assigned an address from the 10.0.0.0/8 network, is DC1 accessible to it (ping , tracert , etc.) at its address on the 10.0.0.0/8 network? And vice versa - is the test machine available to the server.
If available, make sure that the DHCP server is "listening" on the interface on this network (I haven't held modern Windows in my hands for a long time, I think that the good old netstat will help you with this), well, I think to monitor network traffic with some kind of monitor (what is there for Windows?), see what packets arrive at the interface - fly away.

Answer 2

Set up VLANs. There is a lot of information on the net.

Answer 3

If there is an Exchange, then it's not worth shooting in the foot. I would raise a new site in the domain with my controller and my addressing and then crawl into it. But in my opinion it is easier to raise a new domain, at the same time all the old rake laid out by the predecessors can be removed, but this is not fast.