ethtool
Here are few examples of ethtool use. More examples, man page.
ethtool is being supplanted by nmcli, cli to NetworkManager.
Display NIC settings
root@pmox3:~# ethtool enp1s0
Settings for enp1s0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
2500baseT/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
2500baseT/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Link partner advertised pause frame use: Symmetric
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: 1000Mb/s
Duplex: Full
Auto-negotiation: on
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
MDI-X: Unknown
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
drv probe ifdown ifup
Link detected: yes
Get MAC address
root@pmox2:~# ethtool -P eno1
Permanent address: 6c:2b:59:f8:0d:f6
root@pmox2:~# ethtool -P vmbr0
Permanent address: not set
Display the driver used
root@pmox2:~# ethtool -i eno1
driver: e1000e
version: 5.15.39-1-pve
firmware-version: 0.5-4
expansion-rom-version:
bus-info: 0000:00:1f.6
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes
root@pmox2:~# ethtool -i vmbr0
driver: bridge
version: 2.3
firmware-version: N/A
expansion-rom-version:
bus-info: N/A
supports-statistics: no
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no
## Display NIC statistics
Use `ethtool -S enp1s0` or, better yet, `watch -d "ethtool -S eno1"`.
root@pmox3:~# ethtool -S enp1s0 NIC statistics: tx_packets: 12 rx_packets: 5625 tx_errors: 0 rx_errors: 0 rx_missed: 0 align_errors: 0 tx_single_collisions: 0 tx_multi_collisions: 0 unicast: 0 broadcast: 2206 multicast: 3419 tx_aborted: 0 tx_underrun: 0 tx_octets: 1694 rx_octets: 1310239 rx_multicast64: 0 tx_unicast64: 1 tx_broadcast64: 0 tx_multicast64: 11 tx_pause_on: 0 tx_pause_off: 0 tx_pause_all: 0 tx_deferred: 0 tx_late_collision: 0 tx_all_collision: 0 tx_aborted32: 0 align_errors32: 0 rx_frame_too_long: 0 rx_runt: 0 rx_pause_on: 0 rx_pause_off: 0 rx_pause_all: 0 rx_unknown_opcode: 0 rx_mac_error: 0 tx_underrun32: 0 rx_mac_missed: 0 rx_tcam_dropped: 0 tdu: 0 rdu: 0
## NIC test
root@pmox3:~# ethtool -t eno1 The test result is PASS The test extra info: Register test (offline) 0 Eeprom test (offline) 0 Interrupt test (offline) 0 Loopback test (offline) 0 Link test (on/offline) 0
root@pmox3:~# ethtool -t enp1s0
Cannot test: Operation not supported