Configure linux VPN server with wildcard port forwarding to the contracted client + provide video tutorials for future setups.

Configure in our linux servers (CentOS and Ubuntu/Debian) and provide video tutorial about how it has been done so when needed we can do it ourselves... What we want is to create a VPN (pptp and l2tp both, preferably using softeitherVPN) service that sets the connected users IP to our servers public-IP and allow connected users all NAT ports discoverable/accessible. So except for the SSHD (22) port and VPN services ports, all other ports in the server should be forwarded to the connected users intranet/NAT.