How to set up a VPN gateway on OpenBSD?

Question

openvpn

Please tell me how to raise the OpenVPN gateway on BSD.
Given:
A virtual machine with two interfaces, for example - eth0, eth1.
eth0 looks to the outside, eth1 to the virtualbox internal network.
There is an account on nordvpn and, accordingly, OpenVPN configs on a doublevpn connection.
How to organize packet transit from eth1 (internal virtual network) to vpn.
The passage of any packets bypassing vpn is strictly prohibited.

Answer 1

OpenBSD is Theo de Raadt's toy scratching system. It is not meant to be lifted on anything at all. Use GNU/Linux distributions and everything will work for you.