Check the physical status of an Ethernet port in Linux

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Using in-built command :

root@abcd~# ethtool <ethX>


for eg:

root@abcd~# ethtool eth0

Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: on
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000001 (1)
        Link detected: yes




check the last line if it shows yes then that ethernet port is up.






OR 




root@abcd~# dmesg | grep eth






device eth2 entered promiscuous mode

igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX

ADDRCONF(NETDEV_CHANGE): eth2: link becomes ready



























































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