I have one main office running server 2012 R2 as domain controller, file server, and print server. The DC is behind a firewall and has only one NIC. I have another branch office with the same setup however I would like the 2 servers to be able to replicate with each other and a shared drive at main office be available to users at branch office. I don't have a VPN appliances at either office just standard small business routers without VPN. Is it possible to and how can I use the built in RAS on the server2012 at each location to connect the 2 servers?