How to set up packet forwarding within the local network?

Question

Computer networks

Hello! Help solve the problem. I work at a school and I was faced with the task of organizing access for teachers to an electronic journal installed on a PC located in the school building (now you can only connect to it from a local network). But there is one catch, the EJC has a login log, it displays the IP addresses of everyone who logs in to the log and it is necessary that all IPs are only from the local network (there should be no external IPs). I have an idea to set up one PC (on Ubuntu) so that everyone who logs in from a home PC connects to it, and this PC forwards packets to the server with ECV and the local IP is displayed in the login log. How can I do that? Maybe there is some other way? Any suggestions would be welcome... Thanks in advance!

Answer 1

1. Hardware. You will need a fairly smart router, configure VPN reception there, distribute addresses from the local network range on DHCP. The teacher clings to the local school via VPN.
2. Software - raise OpenVPN on the server, similarly - addresses from the local network.
The teacher puts the OpenVPN client, receives configs from you, clings.
UPD: answered a similar question, if you go in the direction of Teamviewer or analogues:
Teamviewer alternative for machines behind NAT with a gray IP?

Answer 2

Openvpn is here to help.

Answer 3

the easiest option is TeamViewer on a computer at school, all log entries are through it