http://www.linuxidc.com/Linux/2007-12/9623p3.htm
These were writed and collected by kf701,
you can use and modify them but NO WARRANTY.
Contact with me : kf_701@21cn.com
程序1:检测接口的 inet_addr,netmask,broad_addr
程序2:检查接口的物理连接是否正常
程序3:更简单一点测试物理连接
程序4:调节音量