sysfs ethernet link status

 

# cat /sys/class/net/eth0/operstate up # macb e000b000.ethernet eth0: Link is Down # cat operstate  down # macb e000b000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off # cat operstate up

[링크 : https://serverfault.com/questions/15776/how-to-check-the-physical-status-of-an-ethernet-port-in-linux]