How to set up RDP connections to different computers?

Question

RDP

Good day dear community.
Given:
- local network with a "zoo" of different servers running Windows Server of different years and versions
- white external IP
- high-speed Internet channel
- medium computer for experiments

It is necessary:
​​- to make sure that different users, under different accounts on different computers, could connect via external IP, each to their own computer.

Question:
- Is it possible to implement this without an L2\L3 switch?

Thanks in advance to everyone for help.

Answer 1

Set up port forwarding on the router and users connect via RDP, and specify in the address:
<external address>:port1
<external address>:port2
, etc.
Each port will forward to the desired server on port 3389.

Answer 2

There is a standard approach - to use Remote Desktop Gateway, which allows you to organize a secure connection via HTTPS to internal RDP servers.

Answer 3

VPN of course, also an alternative to forwarding connections through different ports is cascading rdp connections.
Users connect under a public login and password to the server, which instead of the standard shell runs mstsc (client for connecting via rdp), everything else is limited to the maximum for the user, by the way, it can be a separate machine or several (there will be a heavy load on the network when a large number of simultaneous connections, in principle, everything is the same as with port forwarding, but the pieces of iron are cheaper there).
You will also need to disable the ability to save the login and password in local policies.
ps this solution can be a crutch, but it allows you to basically not touch the firewall settings on the router, i.e. when new users appear, you don’t need to go there