I'm trying to figure out the best way to create a routable VPN between my production network and a small DR server that I have colo'd offsite.
On the production side I have an ASA 5515-X (10.1.0.0/23) and on the DR side I have a Windows Server 2012 R2 server running RRAS, DHCP, NAT, and Hyper-V. The DR server has a virtual environment with a subnet of 10.5.0.0/24 behind NAT (diagram attached for a visual). I've seen some tutorials online for how to create a routable VPN between the two, some utilizing the Windows Advanced Firwall to create an IPSec tunnel. So far, I've not been able to get the tunnel to come up.
Before I spend even more time trying to troubleshoot this, I was wondering what the best way to create a secure connection between these two subnets is and if anybody has done something similar successfully.