Nodes are not consistently configured with IPv4 and/or IPv6 addresses on network adapters that are usable by the cluster.

During cluster validation of a multi-subnet SQL Server 2012 Availability Group cluster, the validation report kept returning the following warning:

"Nodes are not consistently configured with IPv4 and/or IPv6 addresses on network adapters
that are usable by the cluster."

Below that entry was as follows:

Node <Server1> configured with IP addresses from protocol IPv4
Node <Server2> is configured with IP addresses from protocol IPv4 and IPv6

After comparing ipconfig /all and device manager (show hidden devices) entries on both nodes, Server2 included 4 Microsoft ISATAP Adapters, while Server1 didn't.

Shown here as already disabled

After a couple hours of research and verification that we aren't using IPv6 on our network, I disabled the ISATAP devices inside the device manager and the cluster was able to validate properly.