Show negotiated Ethernet link settings
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read-onlyno known side effects Compatibility
LinuxVerified for Linux using posix, bash, zsh syntax.
Operational knowledgereview due 2027-01-20
Requirementsethtoolethtool must be installed and available on PATH.
Version supportethtool Current supported releasesVerified for linux using posix, bash, zsh syntax; consult compatibility notes for platform-specific differences.
Expected signalsSettings for eth0:Representative successful output; values vary with the selected target and system state.
Known errorsethtool: command not foundethtool is missing or is not available on PATH.
Verifyethtool {{interface}}The output matches the expected target and exits without an error.Rollback noteNot required: this command is read-only and does not change system state.
Command breakdown
01ethtoolCommandRuns the ethtool stage of this one-liner.
02<interface>ParameterA value supplied in the Fill parameters section.
Example input
ethtool eth0
Example output
Settings for eth0:
Speed: 1000Mb/s
Duplex: Full
Auto-negotiation: on
Link detected: yes
Illustrative output — exact values vary by system and data.
Official sources