I have followed the guide in the following link to setup my Windows 2008 R2 server to handle VPN connections.
http://www.thomasmaurer.ch/2010/10/how-to-install-vpn-on-windows-server-2008-r2/
My question is how do I know what type of security I have installed following the above? Apparently it's using my domain credentials for logging in but is that enough security? I would prefer to have to instal some sort of certificate on the devices that need to utilize the VPN connection. Is that possible? If so, what options do I change in my current setup to enable that?