CentOS修改mac
http://www.haowlan.com/jishuluntan/488.html
CentOS 修改IP地址, DNS, 网关
http://www.21andy.com/blog/20100227/1717.html
RTNETLINK answers: File exists Error adding address 的解决方法
http://libin0019.iteye.com/blog/1216894
http://hi.baidu.com/522150680/blog/item/608795fd1c387ce4fd037fc3.html