"The problem with corporate networks is they not only stop the
bad guys coming in but also your users who want to work remotely,
whether at home, at a client site or on the road. Here is where a
VPN product comes in, and the simplest to deploy on Windows is a
Linux virtual appliance called OpenVPN.
"The matter of remote access is a perennial concern to network
admins. You can make your network fully locked down so that it is
invisible and impenetrable to the legions of bad guys out on the
Internet, but the question will always arise, “How do I log
in from home?”
"Virtual Private Network – or VPN – technology
exists to solve this problem, allowing users to tunnel in to your
corporate network across the Internet in a secure manner."