I am building a test environment on HyperV running 2012 R2. I have two switches external and internal. I have two VM's, a standalone RRAS server (2008R2)with two NIC's. One is connected to the External switch, the other to the Internal switch (Chris Test Lab). From the RRAS box, I can access the internet, get updates, PING locally and lookup names externally and from the internet. IP setup on the Internal NIC is 10.10.10.1 with no Gateway. DNS on the NIC is pointed to 10.10.10.10, Domain Controller listed below.
My second VM is a Domain Controller (2008R2) connected to the Internal switch. Domain Services are installed and it is functioning correctly. From the Domain Controller, I can PING IP's on my corporate network as well as the RRAS Internal NIC (10.10.10.1). I cannot resolve names external names, I can resolve my Domain Controller name. I have IP Forwarders in DNS set to 8.8.8.8. My DC IP is 10.10.10.10 the GW is set as the RRAS Internal NIC (10.10.10.1).
On the RRAS server, network connection for Chris Test Lab was set to Unidentified Network (Public), I have changed it Private, but name resolution is still not working.