http://yjmade.net/blog/vps/openvpn-windows7-configuration-2010-03.html
http://bbs.chinaunix.net/thread-1638529-1-1.html
http://www.bolehvpn.net/forum/index.php?topic=1746.0
http://blog.csdn.net/zubin006/archive/2009/09/11/4544684.aspx
http://www.xiaohui.com/dev/server/20070514-install-openvpn.htm
