SYNOPSIS
ethtool ethX
ethtool -h|--help
ethtool -a|--show-pause ethX
ethtool -A|--pause ethX [autoneg on|off] [rx on|off] [tx on|off]
ethtool -c|--show-coalesce ethX
ethtool -C|--coalesce ethX [adaptive-rx on|off] [adaptive-tx on|off]
[rx-usecs N] [rx-frames N] [rx-usecs-irq N] [rx-frames-irq N] [tx-usecs
N] [tx-frames N] [tx-usecs-irq N] [tx-frames-irq N] [stats-block-usecs
N] [pkt-rate-low N] [rx-usecs-low N] [rx-frames-low N] [tx-usecs-low N]
[tx-frames-low N] [pkt-rate-high N] [rx-usecs-high N] [rx-frames-high
N] [tx-usecs-high N] [tx-frames-high N] [sample-interval N]
ethtool -g|--show-ring ethX
ethtool -G|--set-ring ethX [rx N] [rx-mini N] [rx-jumbo N] [tx N]
ethtool -i|--driver ethX
ethtool -d|--register-dump ethX [raw on|off]
ethtool -e|--eeprom-dump ethX [raw on|off] [offset N] [length N]
ethtool -E|--change-eeprom ethX [magic N] [offset N] [value N]
ethtool -k|--show-offload ethX
ethtool -K--offload ethX [rx on|off] [tx on|off] [sg on|off]
[tso on|off] [ufo on|off] [gso on|off]
ethtool -p|--blink ethX [N]
ethtool -r|--negotiate ethX
ethtool -S|--statistics ethX
ethtool -t|--test ethX [offline|online]
ethtool -s ethX [speed 10|100|1000] [duplex half|full]
[port tp|aui|bnc|mii] [autoneg on|off] [phyad N] [xcvr internal|exter�‐
nal] [wol p|u|m|b|a|g|s|d...] [sopass xx:yy:zz:aa:bb:cc] [msglvl N]
DESCRIPTION
ethtool is used for querying settings of an ethernet device and chang‐
ing them.
ethX is the name of the ethernet device to work on.
change the pause parameters of the specified ethernet device.
autoneg on|off
Specify if pause autonegotiation is enabled.
rx on|off
Specify if RX pause is enabled.
tx on|off
Specify if TX pause is enabled.
-c --show-coalesce
queries the specified ethernet device for coalescing informa‐
tion.
-C --coalesce
change the coalescing settings of the specified ethernet device.
-g --show-ring
queries the specified ethernet device for rx/tx ring parameter
information.
-G --set-ring
change the rx/tx ring parameters of the specified ethernet
device.
rx N Change number of ring entries for the Rx ring.
rx-mini N
Change number of ring entries for the Rx Mini ring.
rx-jumbo N
Change number of ring entries for the Rx Jumbo ring.
tx N Change number of ring entries for the Tx ring.
-i --driver
queries the specified ethernet device for associated driver
information.
-d --register-dump
retrieves and prints a register dump for the specified ethernet
device. When raw is enabled, then it dumps the raw register
data to stdout.
-e --eeprom-dump
retrieves and prints an EEPROM dump for the specified ethernet
device. When raw is enabled, then it dumps the raw EEPROM data
to stdout. The length and offset parameters allow dumping cer‐
tain portions of the EEPROM. Default is to dump the entire EEP‐
ROM.
Specify if RX checksumming is enabled.
tx on|off
Specify if TX checksumming is enabled.
sg on|off
Specify if scatter-gather is enabled.
tso on|off
Specify if tcp segmentation offload is enabled.
ufo on|off
Specify if UDP fragmentation offload is enabled
gso on|off
Specify if generic segmentation offload is enabled
-p --identify
initiates adapter-specific action intended to enable an operator
to easily identify the adapter by sight. Typically this
involves blinking one or more LEDs on the specific ethernet
port.
N Length of time to perform phys-id, in seconds.
-r --negotiate
restarts auto-negotiation on the specified ethernet device, if
auto-negotiation is enabled.
-S --statistics
queries the specified ethernet device for NIC- and driver-spe‐
cific statistics.
-t --test
executes adapter selftest on the specified ethernet device. Pos‐
sible test modes are:
offline|online
defines test type: offline (default) means to perform full set
of tests possibly causing normal operation interruption during
the tests, online means to perform limited set of tests do not
interrupting normal adapter operation.
-s --change
option allows changing some or all settings of the specified
ethernet device. All following options only apply if -s was
specified.
speed 10|100|1000
Set speed in Mb/s. ethtool with single argument will show you
the supported device speeds.
xcvr internal|external
Select transceiver type. Currently only internal and external
can be specified, in the future further types might be added.
wol p|u|m|b|a|g|s|d...
Set 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 phy activity
u Wake on unicast messages
m Wake on multicast messages
b Wake on broadcast messages
a Wake on ARP
g Wake on MagicPacket(tm)
s Enable SecureOn(tm) password for MagicPacket(tm)
d Disable (wake on nothing). This option clears all previous
options.
sopass xx:yy:zz:aa:bb:cc
Set the SecureOn(tm) password. The argument to this option must
be 6 bytes in ethernet MAC hex format (xx:yy:zz:aa:bb:cc).
msglvl N
Set the driver message level. Meanings differ per driver.
BUGS
Not supported (in part or whole) on all ethernet drivers (read
/usr/share/doc/ethtool/README.Debian to get an idea about supported
features).
COMPATIBILITY
Requires 2.4 or newer kernel to be effective. Also work on Sparc run‐
ning 2.2 kernel with Happy Meal ethernet card.
AUTHOR
ethtool was written by David Miller.
Modifications by Jeff Garzik, Tim Hockin, Jakub Jelinek, Andre Majorel,
Eli Kupermann, Scott Feldman, Andi Kleen.
AVAILABILITY
ethtool is available over the Web on the SourceForge site at
http://sourceforge.net/projects/gkernel/
Ethtool version 5 September 2006 ETHTOOL(8)
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