I would like to implement a Windows Domain Network, corp.mydomain.com.
The domain network will consist of 3 LANs (in small offices/residences) that will use Comcast or AT&T as their internet provider.
I would prefer to have at least 2 domain controllers at each location.
From what I understand, it would be costly to do a Wide Area Network. If I use Virtual Private Networking, can it be set up on the domain controllers of the 2 remote locations? I want to make the 3 LANs exist on the domain without user execution.
Are there any alternatives other than VPN or WAN? I have done some research but haven't found any detailed documentation on how to do this.