• NAME
  
  ethtool - Display or change ethernet card settings
• SYNOPSIS
  
  ethtool ethX
  ethtool -h|--help
  ethtool -a|--show-pause ethX
  ethtool -A|--pause ethX 2 autoneg on off 2 rx on off 2 tx on off
  ethtool -c|--show-coalesce ethX
  ethtool -C|--coalesce ethX 2 adaptive-rx on off 2 adaptive-tx on off N ] N ] N ] N ] N ] N ] N ] N ] N ] N ] N ] N ] N ] N ] N ] N ] N ] N ] N ] N ]
  ethtool -g|--show-ring ethX
  ethtool -G|--set-ring ethX N ] N ] N ] N ]
  ethtool -i|--driver ethX
  ethtool -d|--register-dump ethX 2 raw on off 2 hex on off name ]
  ethtool -e|--eeprom-dump ethX 2 raw on off N ] N ]
  ethtool -E|--change-eeprom ethX N ] N ] N ]
  ethtool -k|--show-offload ethX
  ethtool -K|--offload ethX 2 rx on off 2 tx on off 2 sg on off 2 tso on off 2 ufo on off 2 gso on off 2 gro on off 2 lro on off
  ethtool -p|--identify ethX [ N ]
  ethtool -r|--negotiate ethX
  ethtool -S|--statistics ethX
  ethtool -t|--test ethX 1 offline online
  ethtool -s ethX speed N 2 duplex half full 4 port tp aui bnc mii fibre 2 autoneg on off N ] N ] 2 xcvr internal external N ]
  ethtool -n ethX
  ethtool -N ethX
• 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.

  -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.

  Specifies whether pause autonegotiation should be enabled.

  Specifies whether RX pause should be enabled.

  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.

  Specifies whether RX checksumming should be enabled.

  Specifies whether TX checksumming should be enabled.

  Specifies whether scatter-gather should be enabled.

  Specifies whether TCP segmentation offload should be enabled.

  Specifies whether UDP fragmentation offload should be enabled

  Specifies whether generic segmentation offload should be enabled

  Specifies whether generic receive offload should be enabled

  Specifies whether large 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:

  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 N

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

  Sets full or half duplex mode.

  Selects device port.

  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:

  "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)"

  "0x1000" "   10000 Full"

  "0x03F" "    Auto"

  phyad N

  PHY address.

  Selects transceiver type. Currently only internal and external can be

  specified, in the future further types might be added.

  wol (WO

  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 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 (MAc

  Sets the SecureOn(tm) password.  The argument to this option must be 6 bytes in ethernet MAC hex format ((MA).

  msglvl N

  Sets the driver message level. Meanings differ per driver.

  -n --show-nfc

  Retrieves the receive network flow classification configurations.

  rx-flow-hash (FL

  Retrieves the hash options for the specified network traffic type.

  "tcp4" "    TCP over IPv4"

  "udp4" "    UDP over IPv4"

  "ah4" "     IPSEC AH/ESP over IPv4"

  "sctp4" "   SCTP over IPv4"

  "tcp6" "    TCP over IPv6"

  "udp6" "    UDP over IPv6"

  "ah6" "     IPSEC AH/ESP over IPv6"

  "sctp6" "   SCTP over IPv6"

  -N --config-nfc

  Configures the receive network flow classification.

  rx-flow-hash (FL (HO

  Configures the hash options for the specified network traffic type.

  p

  Hash on the device port number on which the packet was received.

  m

  Hash on the Layer 2 destination address of the rx packet.

  v

  Hash on the VLAN tag of the rx packet.

  t

  Hash on the Layer 3 protocol field of the rx packet.

  s

  Hash on the IP source address of the rx packet.

  d

  Hash on the IP destination address of the rx packet.

  f

  Hash on bytes 0 and 1 of the Layer 4 header of the rx packet.

  n

  Hash on bytes 2 and 3 of the Layer 4 header of the rx packet.

  r

  Discard all packets of this flow type. When this option is set, all other options are ignored.

• 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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