ethtool

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

• Display the current settings for an interface:
  ethtool {{eth0}}
• Display the driver information for an interface:
  ethtool --driver {{eth0}}
• Display all supported features for an interface:
  ethtool --show-features {{eth0}}
• Display the network usage statistics for an interface:
  ethtool --statistics {{eth0}}
• Blink one or more LEDs on an interface for 10 seconds:
  ethtool --identify {{eth0}} {{10}}
• Set the link speed, duplex mode, and parameter auto-negotiation for a given interface:
  ethtool -s {{eth0}} speed {{10|100|1000}} duplex {{half|full}} autoneg {{on|off}}