When installing a Windows Server 2012 R2 domain controller, you get this warning:
This computer has at least one physical network adapter that does not have static IP address(es) assigned to its IP Properties. If both IPv4 and IPv6 are enabled for a network adapter, both IPv4 and IPv6 static IP addresses should be assigned to both IPv4 and IPv6 Properties of the physical network adapter. Such static IP address(es) assignment should be done to all the physical network adapters for reliable Domain Name System (DNS) operation.
This is because at least one of the network adapters does not have a static IP. This may or may not be a problem. Obviously on a server any network adapter that you use should have a static IP. AD will work with a DHCP address, but as IP addresses can change when assigned by DHCP, aspects of AD could become unavailable – such as DNS or synchronization. In my case, I have 2 network adapters, one with a dynamic IP address (unused / created by the Hyper-V install) and the other with a static IP address for AD. In this scenario it is safe to ignore the warning.