Access PPTP VPN client from LAN

[AllanJ]

I have connected a (Linux) PPTP client to the VPN on my AC68U router with Merlin firmware. The client gets the IP 192.168.10.2. My LAN on the router runs on 192.168.37.x. How can I set it up so I can access 192.168.10.2 from my LAN, eg. from 192.168.37.2. I can ping the client just fine from the router, but not from 192.168.37.2. Why is that and how do I fix it, so I can connect to services on the client?

I also tried connecting 192.168.37.2 as a VPN client (so it got the IP 192.168.10.3) to see if the router would then correctly route traffic to 10.2 but that didn't work either...