ethtool

Display and modify Network Interface Controller (NIC) parameters. More information: http://man7.org/linux/man-pages/man8/ethtool.8.html.

ethtool eth0

ethtool --driver eth0

ethtool --show-features eth0

ethtool --statistics eth0

ethtool --identify eth0 10

ethtool -s eth0 speed 10|100|1000 duplex half|full autoneg on|off