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Use the ethtool command to get information about your Ethernet adapter.

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The ethtool utility for Linux is very good at getting information about your Ethernet adapter. Below is the standard information that is available concerning the basic abilities of the Ethernet adapter.

localhost% ethtool enp0s25
Settings for enp0s25:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Supported pause frame use: No
        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: 100Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: on (auto)
Cannot get wake-on-lan settings: Operation not permitted
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes

This command shows the time stamping parameters for my network adapter.

localhost% ethtool -T enp0s25
Time stamping parameters for enp0s25:
Capabilities:
        hardware-transmit     (SOF_TIMESTAMPING_TX_HARDWARE)
        software-transmit     (SOF_TIMESTAMPING_TX_SOFTWARE)
        hardware-receive      (SOF_TIMESTAMPING_RX_HARDWARE)
        software-receive      (SOF_TIMESTAMPING_RX_SOFTWARE)
        software-system-clock (SOF_TIMESTAMPING_SOFTWARE)
        hardware-raw-clock    (SOF_TIMESTAMPING_RAW_HARDWARE)
PTP Hardware Clock: 0
Hardware Transmit Timestamp Modes:
        off                   (HWTSTAMP_TX_OFF)
        on                    (HWTSTAMP_TX_ON)
Hardware Receive Filter Modes:
        none                  (HWTSTAMP_FILTER_NONE)
        all                   (HWTSTAMP_FILTER_ALL)
        ptpv1-l4-sync         (HWTSTAMP_FILTER_PTP_V1_L4_SYNC)
        ptpv1-l4-delay-req    (HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ)
        ptpv2-l4-sync         (HWTSTAMP_FILTER_PTP_V2_L4_SYNC)
        ptpv2-l4-delay-req    (HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ)
        ptpv2-l2-sync         (HWTSTAMP_FILTER_PTP_V2_L2_SYNC)
        ptpv2-l2-delay-req    (HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ)
        ptpv2-event           (HWTSTAMP_FILTER_PTP_V2_EVENT)
        ptpv2-sync            (HWTSTAMP_FILTER_PTP_V2_SYNC)
        ptpv2-delay-req       (HWTSTAMP_FILTER_PTP_V2_DELAY_REQ)

Show the network statistics like this.

localhost% ethtool -S enp0s25

Show the permanent hardware address with this command.

localhost% ethtool -P enp0s25

Print information about Ethernet adapter features with this command.

localhost% ethtool -k enp0s25

If your machine has multiple NIC devices in it and it is desired to know which physical device is which, use this command as root to make the LED lights flash to identify the particular NIC.

[root@localhost vtwm-5.4.7]# ethtool -p enp0s25

Do an EEPROM dump from the NIC device with this command as root.

[root@localhost vtwm-5.4.7]# ethtool -e enp0s25

This command, when used as root is also able to flash the firmware of a NIC with custom firmware, but that is something that is not to be taken lightly.

If you do not know the interface name use this example, this will find the active interface name and then query it.


┌──(john㉿DESKTOP-PF01IEE)-[~/Documents]
└─$ ethtool `ip a | awk ‘/UP/ { print $2 }’ | sed -n 2p | cut -d “:” -f1`
Settings for eth0:
Supported ports: [ ]
Supported link modes: Not reported
Supported pause frame use: No
Supports auto-negotiation: No
Supported FEC modes: Not reported
Advertised link modes: Not reported
Advertised pause frame use: No
Advertised auto-negotiation: No
Advertised FEC modes: Not reported
Speed: 10000Mb/s
Duplex: Full
Port: Other
PHYAD: 0
Transceiver: internal
Auto-negotiation: off
Cannot get wake-on-lan settings: Operation not permitted
Current message level: 0x000000f7 (247)
drv probe link ifdown ifup rx_err tx_err
Link detected: yes

Another example of the same one-liner. This is using parentheses instead of backticks.

┌──(john㉿DESKTOP-PF01IEE)-[~/Documents]
└─$ ethtool $(ip a | awk '/UP/ { print $2 }' | sed -n 2p | cut -d ":" -f1)
Settings for eth0:
        Supported ports: [ ]
        Supported link modes:   Not reported
        Supported pause frame use: No
        Supports auto-negotiation: No
        Supported FEC modes: Not reported
        Advertised link modes:  Not reported
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: 10000Mb/s
        Duplex: Full
        Port: Other
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: off
Cannot get wake-on-lan settings: Operation not permitted
        Current message level: 0x000000f7 (247)
                               drv probe link ifdown ifup rx_err tx_err
        Link detected: yes

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