Help setting up VON on a linux router/firewall/cache server

Hello,

I'm contributing through this account since +1yr and i have still never used your VPN service.

I would actually like tointegrate a vpn bridge to my current setup which is a Linux Debian server 9.0 including two ethernet cards with a custom router/firewall, a webmin server including squid proxy server for http requests.

Please allow me to learn the most simple way to integrate the VPN.

I have checked bitmask already but i'm having trouble to make the signal flow from internet to my local ethernet.

I'm not using any graphical interface, can only work with bash lines and terminal connections

Let me know, i would appreciate some help

Thank you