How to set up a windows server 2012 R2 domain on 3 networks?

Question

Active Directory

We plan to install windows server 2012 r2 with 3 physical network cards in order to combine 3 different networks in one domain. There are 3 different networks (3 hosts) and these devices do not intersect (3 Internet accesses). But at the same time, all 3 must be united by one domain (managed by one controller, probably via DNS) for management purposes.

It is assumed that each network will still have its own independent DHCP, and the domain should simply distribute the domain network.

How is it possible to implement it?

Answer 1

How is it possible to implement it?

Leave the organization of the network at the mercy of network devices, ensure the availability of CD from all networks and everything will be OK

Answer 2

Physically connect the networks with a router, isolate these three subnets on it as needed, but provide all three with access to the controller.

Answer 3

The first link in Google for "windows server router" is https://www.itworkroom.com/windows-server2012-r2-r...
No thanks.

Answer 4

The difficulty will be in setting DNS .
There are official articles:
https://docs.microsoft.com/en-us/windows-server/ne...
https://docs.microsoft.com/en-us/windows-server/ne...
But how it works for a case when it is necessary to give different addresses of one AD DC - I do not presume to judge. Maybe you will be the first person to successfully implement such a strange scheme. And even in this case, the painfully hitting rake can jump out later, during operation.
And so - the answers given by Sasha Odarchuk and Dmitry Shitskov push you in the right direction. Listen to them, and it will do without a rake.