How to direct requests to one machine in the network?

Question

Computer networks

Hello everyone

I could not find this information on the Internet.

I connected a static white IP address (a service from the provider), and now all requests to this address are sent to my network through a router.

There are ~5-10 devices behind the router, of which only one should work from this external IP address.

I'm not a networking expert.
How to set up a network so that only one machine on the network has an external address, and all the others work as before?

The DIR-300 router is on the latest firmware (there is a full stuffing of possibilities), and there is Keenetic in case of emergency.

Thanks

to Update 1 - while it has not been configured yet, only the service is connected, so I don’t know if DHCP issues a static external address there, or if you need to configure the router, for now xs.

Answer 1

In order for only 1 machine to go online with this external IP, you need to connect it to the provider directly. Right now, all the machines that will be behind the router go to the Internet with this IP.
And what exactly is the problem? why doesn't it fit? Just forward the necessary ports in the router to the "server" and that's it ...
DIR-300 and the concept of "full stuffing of possibilities" certainly amused)) good joke

Answer 2

The concepts of "DIR-300" and "full stuffing of opportunities" are compatible only if they wanted to say that there is a complete pipets with opportunities.
Forwarding to the desired machine on the desired port(s).
The kineticist should be able to.

Answer 3

What do you mean by "worked as before"? You were given an external address, the old gray address was most likely nailed down and now you only have a new one.