参考：http://blog.sina.com.cn/s/blog_6f9797380101m03x.html
route print
route add 0.0.0.0 mask 0.0.0.0 192.168.0.1
route delete 0.0.0.0
参考：http://blog.sina.com.cn/s/blog_6f9797380101m03x.html
route print
route add 0.0.0.0 mask 0.0.0.0 192.168.0.1
route delete 0.0.0.0