How to organize control of another computer not via the Internet / LAN, but for example via USB?

Question

Computer networks

Good afternoon!
The task is somewhat strange.
There is a computer that needs to be controlled remotely, but which cannot be released to the Internet and which cannot be allowed into the local network. Thus, it is necessary to organize communication using some other protocol.
While such a bundle is being built - computer 1 is traditionally controlled through remote administration programs (Team Viewer, AnyDeskt, AmmyAdmin, etc ...) a tricky cable is already going from it to computer 2 - and the same screen-mouse-keyboard is transmitted there, but... by the USB protocol, let's say.
It seems that there are such things:
https://www.atenpro.ru/catalog/kvm_oborudovanie/re...
But as I understand it, they are biting and in fact it is the same computer, but with its own cable and software.

Answer 1

> which cannot be released to the Internet and which cannot be allowed into the local network
, connect as usual with a twisted pair cable via rj-45, but do not let it into the Internet and the local network, what problems ...

Answer 2

What prevents the evil Eve from breaking the first computer first (by the way, those remote administration tools that you listed are a total sieve that allows their owners and third parties to pick any client computer with pleasure), and then frolic on the second one?

Answer 3

Put another network card on PC 1, set up a network only between 2 PCs? and control via VNC for example.
or allocate PC 2 to a separate VLAN with its own subnet and the necessary restrictions, such as lack of Internet

Answer 4

A person has no understanding of what the Internet and a local network are. Network access can be restricted on the router. And for management it is better to use standard VNC, RDP solutions.
But if you really need it, then hardware access is also possible - called IP-KVM - it connects instead of a monitor and via usb and transmits data in TCP-IP networks.
Here is an example: https://aliexpress.ru/item/32815314499.html

Answer 5

Another option is a virtual machine.

Answer 6

Nobody needs to be fooled. The second network network in the computer, the crossover to the second computer, disable routing between network networks and instruct blocking firewalls.
You can IP-KVM - if you have a lot of extra money