Setting up a test network in Hyper-V based on virtual WinServ 2012 R2?

Question

Computer networks

Good day!
I want to create a small network for testing based on a physical machine with Hyper-V installed on it and WinServ 2012 R2 * 2 created on it for AD, DHCP, DNS and Exchange and one machine on WIn7.
Faced the problem that no one sees anyone and does not function as it should.
Ideally, it is necessary that only the domain controller has access to the Internet, or at least that the machines see and catch ip from the controller.
Is it possible to do this at all on Hyper-V or am I doing something wrong?
The virtual switch manager is configured for the internal network.
There may be problems with the DNS service, I'll try to configure it.