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# ethtool - Unix, Linux Command

# NAME

ethtool - Display or change ethernet card settings

# 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] [hex on|off] [file name]

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] [gro 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|2500|10000] [duplex half|full] [port tp|aui|bnc|mii|fibre] [autoneg on|off] [advertise N] [phyad N] [xcvr internal|external] [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 changing them.

ethX is the name of the ethernet device on which ethtool should operate.

# OPTIONS

ethtool with a single argument specifying the device name prints current settings of the specified device.

Tag | Description
--- | ---
-h --help | Shows a short help message.
-a --show-pause
| Queries the specified ethernet device for pause parameter information.
-A --pause
| Changes the pause parameters of the specified ethernet device.
autoneg on|off
| Specifies whether pause autonegotiation should be enabled.
rx on|off
| Specifies whether RX pause should be enabled.
tx on|off
| Specifies whether TX pause should be enabled.
-c --show-coalesce
| Queries the specified ethernet device for coalescing information.
-C --coalesce
| Changes 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
| Changes the rx/tx ring parameters of the specified ethernet device.
rx N | Changes the number of ring entries for the Rx ring.
rx-mini N
| Changes the number of ring entries for the Rx Mini ring.
rx-jumbo N
| Changes the number of ring entries for the Rx Jumbo ring.
tx N | Changes the 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. The register format for some devices is known and decoded others are printed in hex. When raw is enabled, then ethtool dumps the raw register data to stdout. If file is specified, then use contents of previous raw register dump, rather than reading from the device.

-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 certain portions of the EEPROM. Default is to dump the entire EEPROM.
-E --change-eeprom
| Changes EEPROM byte for the specified ethernet device. offset and value specify which byte and it’s new value. Because of the persistent nature of writing to the EEPROM, a device-specific magic key must be specified to prevent the accidental writing to the EEPROM.
-k --show-offload
| Queries the specified ethernet device for offload information.
-K --offload
| Changes the offload parameters of the specified ethernet device.
rx on|off
| Specifies whether RX checksumming should be enabled.
tx on|off
| Specifies whether TX checksumming should be enabled.
sg on|off
| Specifies whether scatter-gather should be enabled.
tso on|off
| Specifies whether TCP segmentation offload should be enabled.
ufo on|off
| Specifies whether UDP fragmentation offload should be enabled
gso on|off
| Specifies whether generic segmentation offload should be enabled
gro on|off
| Specifies whether generic receive offload should be 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-specific statistics.
-t --test | Executes adapter selftest on the specified ethernet device. Possible 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
| Allows changing some or all settings of the specified ethernet device. All following options only apply if -s was specified.
speed 10|100|1000|2500|10000
| 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|fibre
| Selects device port.
autoneg on|off
| Specifies whether autonegotiation should be enabled. Autonegotiation is enabled by deafult, but in some network devices may have trouble with it, so you can disable it if really necessary.
advertise N
| Sets the speed and duplex advertised by autonegotiation. The argument is a hexidecimal value using one or a combination of the following values:

Tag | Description
--- | ---
0x001 10 Half 0x002 10 Full 0x004 100 Half 0x008 100 Full 0x010 1000 Half(not supported by IEEE standards)
0x020 1000 Full
0x8000 2500 Full(not supported by IEEE standards)
0x800 10000 Full
0x03F Auto

phyad N | PHY address.
xcvr internal|external
| Selects 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...
| 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.

Tag | Description
--- | ---
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
| Sets 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
| Sets the driver message level. Meanings differ per driver.

# BUGS

Not supported (in part or whole) on all ethernet drivers.

# 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/

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