Ethtool is a small utility for examining and tuning the settings of Ethernet-based network interfaces. With ethtool, it is possible to control various parameters, such as:
- Speed
- Media type
- Duplex operation
- Getting/setting EEPROM register content
- Hardware check summing
- Wake-on-LAN
Syntax
The syntax of the ethtool command is:
# ethtool [options] {device name}
ethtool Command Options
The following table describes some common ethtool command options.
| Option | Used To |
|---|---|
| -S {interface} | Show statistics for a NIC. |
| -i {interface} | Show driver information for a NIC. |
| -t {interface} | Execute a self-test on the NIC. |
| -s {interface} {setting} {value} | Change some of a NIC’s settings, such as its speed and duplex mode. |
| -f {interface} {image} | Write (“flash”) a firmware image to the NIC. |
ethtool Command Examples
1. Display the current settings for an interface:
# ethtool eth0
2. Display the driver information for an interface:
# ethtool --driver eth0
3. Display all supported features for an interface:
# ethtool --show-features eth0
4. Display the network usage statistics for an interface:
# ethtool --statistics eth0
5. Blink one or more LEDs on an interface for 10 seconds:
# ethtool --identify eth0 10
6. 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
7. Display the Ethernet interface driver settings using ethtool command as shown here:
# ethtool -i enp0s3
8. Modifying the Ethernet interface settings using ethtool command as shown:
# ethtool --change enp0s3 speed 10 duplex half autoneg off