How to connect PC to two wifi networks?

Question

Do it yourself

Good afternoon everyone! Soon there will be a need to connect computers to 2 networks. For N reasons, our network is built on wifi. In the theory that I will describe below, everything should work correctly, I want to hear either criticism if everything is very bad or instruction that everything will work.
I’ll explain right away why we need networks 1 and 2, network 1 is an Internet connection, a file server + a printer. The second network will be without Internet, it will have a PC to which you need to connect via RDP + the file server will be transferred here.
For each PC, purchase another wifi module. Buy a router, set up a DCHP server on it on a network other than the main one. And connect all PCs to it.
After all, according to the idea of ​​conflicts should not be?

Answer 1

Just configure the routes to the second network and that's it (in theory, this can even be registered in DHCP). Another question - why such a garden? After all, you can make one Wi-Fi with an internal network, and from it, through a VPN, release it to the Internet using a login / password.
Or let me guess, sir. institution?
PS
You run the risk of getting a "sea of ​​​​positive" by polluting yourself with a Wi-Fi channel and thereby setting up a network for yourself.

Answer 2

• Networks should hang on different channels (with a difference in numbers of at least 5, i.e. 1 and 6, 4 and 10) to avoid mutual jamming of signals.
  It's like organizing.
  The question is simple - why? You can just connect the server to the network and make password access.
  Since computers are connected to both networks, the “lack” of an Internet connection at the server is compromised by the presence of it at the clients (I encountered this in one large organization, the local security department switched to spontaneous checks with the arrest of equipment for a while).

Answer 3

I strongly do not recommend doing anything server-side on the wifi interface

Answer 4

Leave 1 network, transfer the Internet to a separate machine, let everyone on the Internet only through a proxy on this machine. For the operation of such an Internet, it is enough for all 110%, it will not work to cut yourself in network games, but this, as it were, is not required. What it gives:
+ Lack of noise in the WIFI range (2 points will have an extremely negative effect on each other, a little less if configured correctly) + Security (passing through the proxy is
problematic, to put it mildly)
YouTube during business hours)