Building a network in the office with a VPN?

Question

linux

There is: A computer with Linux Mint 18.3 (a server with 2 network cards), a kennetic router, a switch, a lot of wires and about 5 computers!
The task is to set up the network in the office in such a way:
It is necessary that the Internet goes to the computer (Linux), it must be connected to the VPN network, and from it the outgoing traffic goes to the router, from the router to the switch from the switch to other machines! Please tell me how to set up Linux so that the traffic goes to the whole office through vpn, what needs to be installed, as I understand it, iptables, open-vpn... Orient in which direction to look!
Ask questions! I will answer everyone!

Answer 1

1. Set up ip forwarding on the Linux server
2. Set up a VPN connection wherever you need it. You did not specify how the destination VPN server is implemented
3. On network clients, configure the IP address of your Linux server as a gateway

Answer 2

Lift the VPN from the router - he knows how to do it very well. Then you won't have to configure anything on the computers.