hamachi

http://www.hamachi.cc/
簡単に仮想ネットワークが構築できるツールのようだ。

Hamachi is a zero-configuration virtual networking application enabling secure direct communications between any two computers on the Internet regardless of the presence of firewalls or address translation devices on the route between them. In particular, it can create true peer-to-peer network between two computers each residing behind its own broadband router. Sleek and simple interface, fast and transparent operation.