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.