I've got a consumer grade ASUS router (RT-AX56U) running OpenVPN Server (Let's call it HomeSweetHome), which I'm using to get remote access to my samba server from outside the network. At the same time, the router is tasked with running an OpenVPN client connection to PIA VPN, which is a necessity because of my location.
Both VPN connections work fine until I try to run them at once - at which point any HomeSweetHome client loses the ability to access global network while still having LAN access to my samba.
So basically, what I need is for my router to pass requests for Internet traffic coming through HomeSweetHome further to PIA, while also providing me with an access to LAN.
I found a couple similar questions being asked before, but they are focused around running both a client and a server on a separate hardware (mainly on Raspberry Pi) and my networking knowledge is somewhat limited to adapt the solution to my consumer-grade hardware.