Ethtool

Primary means in Linux kernel-based operating systems for displaying and modifying the parameters of network interface controllers and their associated device driver software from application programs running in userspace.

• https://n0tes.fr/2019/12/03/ethtool/

Looking interface problems

ethtool -S enp2s1
NIC statistics:
     tx_packets: 72761
     rx_packets: 81459
     tx_errors: 0
     rx_errors: 0
     rx_missed: 0
     align_errors: 0
     tx_single_collisions: 0
     tx_multi_collisions: 0
     unicast: 76717
     broadcast: 3938
     multicast: 804
     tx_aborted: 0
     tx_underrun: 0

Statistics

ethtool -m enp2s1

Informations (driver, firmware, supported operations)

ethtool -i enp2s1

Change MAC address

ethtool -s enp2s1 phyad 42:21:10:05:02:00

Change the speed

ethtool -s enp2s1 speed 1000 duplex full autoneg on