ethtool

ethtool is used for querying settings of an ethernet device and changing them.

• ethtool [EN] @ Wikipedia

Documentation

• man 8 'ethtool' [EN]

Syntax

ethtool [PARAMETER] INTERFACE [OPTION ...]

Parameters

-s, --change

Allows changing some or all settings of the specified ethernet device. All following options only apply if -s was specified.

speed NUMBER

Set speed in Mb/s. ethtool with just the device name as an argument will show you the supported device speeds.

duplex half|full

Sets full or half duplex mode.

port tp|aui|bnc|mii

Selects device port.

autoneg on|off

Specifies whether autonegotiation should be enabled. Autonegotiation is enabled by default, but in some network devices may have trouble with it, so you can disable it if really necessary.

wol p|u|m|b|a|g|s|d

Sets Wake-on-LAN options. Not all devices support this. The argument to this option is a string of characters specifying which options to enable.

p

Wake on physical activity.

u

Wake on unicast messages.

m

Wake on multicast messages.

b

Wake on broadcast messages.

a

Wake on ARP.

g

Wake on 'MagicPacket'.

s

Enable 'SecureOn' password for 'MagicPacket'.

d

Disable (wake on nothing). This option clears all previous options.

Examples

Set link speed, duplex mode and autonegotiation

ethtool --change 'eth0' speed 1000 duplex 'full' autoneg 'off'

Activate Wake-on-LAN

ethtool --change 'eth0' wol 'g'