LogMeIn Hamachi requires very little configuration to allow you to extend your domain over the VPN.

You will need to install the software on the Server, create a Gateway Network, and add your Server to it. The last step of the creation of the network is to set the Gateway Node and select your server.

At this point, your Server will lose Internet connectivity for a few moments, as Hamachi configures the routing information to allow the network users to authenticate to the domain. No additional configuration on your part is needed.