Access to computers behind client router

[gabrielewig]

I'm trying to set up VPN access to a handful of computers at our lab. File management, checking tests, etc. The building we lease doesn't allow us to port forward anything, so we've setup an OpenVPN AS on digital ocean and have connected both the remote computers and the lab router to that VPN.

Connections seem to work, and we can see the router remotely. But we cannot figure out how to connect to the computers behind the router. How would we expose those computers to the VPN network for access?

Thank you for the help!