So … Windows end-users are setting up their own VPNs with Hamachi and other networking programs.
Must be a fun time to be an IT security guy these days. *shudder*
wikipedia.org: Hamachi
An open source alternative to Hamachi: tinc
List of Hamachi Alternatives|Virtual Private Network Adapters
Hamachi: Roll Your Own VPNs the Fast and Free Way, Create and Manage Your Own Virtual Private Networks
