I'm currently configuring a Windows 2012 server to be a Routing and Remote Access server (PPTP VPN). I'm able to successfully connect to the server via my Windows machine and my Macbook using a mobile broadband device; that much is working. I'm also able to successfully ping internal IP addresses at that site and access resources.
We have 2 other sites connected to this site using Site-Site VPN's configured on our routers, our remote office and our production data center. I'd like to be able to connect to the VPN server and have access to the other two sites (IP range for site B is 192.168.1.0/24 and for site C is 192.168.100.0/23). I've tried setting up routes in the Routing and Remote Access console, but so far have not met with success.
I'm very grateful for any tips or tricks to get this working!