http://ccd9527.blogspot.tw/2009/01/ubuntu_25.html
http://blog.xuite.net/chu.hsing/Think/30713094-%5BUbuntu%5D+-+rc.local%E4%BC%BC%E4%B9%8E%E6%B2%92%E6%9C%89%E9%96%8B%E6%A9%9F%E5%95%9F%E5%8B%95
http://beakdoosan.blogspot.tw/2010/12/linux-route.html