netstat -i FLG含义

netstat -i 的描述时 display interface table，其中最后一列为FLG，其标识如下：

• B = A broadcast address has been set.
• L = This interface is a loopback device.
• M = All packets are received (promiscuous mode).
• O = ARP is turned off for this interface.
• P = This is a point-to-point connection.
• R = Interface is running.
• U = Interface is up.

参考：http://unix.stackexchange.com/questions/109251/understand-netstat-i-flgs