Connecting external computer to the virtual environment

Hi,

I am using Windows Server 2012 - Hyper-V Host with 2 virtual instances inside, VM1 and VM2. The VM1 role is RRAS server and VM2 is a Database server. The remote users connect to RRAS server (through PPTP VPN) to be able to access the Database server.

I wanted to add a physical server (Linux) and configure and connect it in same segment as the VM2 or Database Server.

My question is how will I connect the Physical Server to the virtual network so that users will use the same RRAS server to access  the Linux Box.

Appreciate your help.