ethtool is a command used to query and set network card parameters.
You can use ethtool to check the status of many network cards and other information, and then analyze the current network problems.
- Command format:
ethtool [参数] [网络设备] - Command function:
ethtool 查询或控制网络驱动程序和硬件设置- Command parameters
ethtool version 3.15
Usage:
ethtool DEVNAME Display standard information about device
ethtool -s|--change DEVNAME Change generic options
[ speed %d ]
[ duplex half|full ]
[ port tp|aui|bnc|mii|fibre ]
[ mdix auto|on|off ]
[ autoneg on|off ]
[ advertise %x ]
[ phyad %d ]
[ xcvr internal|external ]
[ wol p|u|m|b|a|g|s|d... ]
[ sopass %x:%x:%x:%x:%x:%x ]
[ msglvl %d | msglvl type on|off ... ]
ethtool -a|--show-pause DEVNAME Show pause options
ethtool -A|--pause DEVNAME Set pause options
[ autoneg on|off ]
[ rx on|off ]
[ tx on|off ]
ethtool -c|--show-coalesce DEVNAME Show coalesce options
ethtool -C|--coalesce DEVNAME Set coalesce options
[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 DEVNAME Query RX/TX ring parameters
ethtool -G|--set-ring DEVNAME Set RX/TX ring parameters
[ rx N ]
[ rx-mini N ]
[ rx-jumbo N ]
[ tx N ]
ethtool -k|--show-features|--show-offload DEVNAME Get state of protocol offload and other features
ethtool -K|--features|--offload DEVNAME Set protocol offload and other features
FEATURE on|off ...
ethtool -i|--driver DEVNAME Show driver information
ethtool -d|--register-dump DEVNAME Do a register dump
[ raw on|off ]
[ file FILENAME ]
ethtool -e|--eeprom-dump DEVNAME Do a EEPROM dump
[ raw on|off ]
[ offset N ]
[ length N ]
ethtool -E|--change-eeprom DEVNAME Change bytes in device EEPROM
[ magic N ]
[ offset N ]
[ length N ]
[ value N ]
ethtool -r|--negotiate DEVNAME Restart N-WAY negotiation
ethtool -p|--identify DEVNAME Show visible port identification (e.g. blinking)
[ TIME-IN-SECONDS ]
ethtool -t|--test DEVNAME Execute adapter self test
[ online | offline | external_lb ]
ethtool -S|--statistics DEVNAME Show adapter statistics
ethtool -n|-u|--show-nfc|--show-ntuple DEVNAME Show Rx network flow classification options or rules
[ rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6 |
rule %d ]
ethtool -N|-U|--config-nfc|--config-ntuple DEVNAME Configure Rx network flow classification options or rules
rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6 m|v|t|s|d|f|n|r... |
flow-type ether|ip4|tcp4|udp4|sctp4|ah4|esp4
[ src %x:%x:%x:%x:%x:%x [m %x:%x:%x:%x:%x:%x] ]
[ dst %x:%x:%x:%x:%x:%x [m %x:%x:%x:%x:%x:%x] ]
[ proto %d [m %x] ]
[ src-ip %d.%d.%d.%d [m %d.%d.%d.%d] ]
[ dst-ip %d.%d.%d.%d [m %d.%d.%d.%d] ]
[ tos %d [m %x] ]
[ l4proto %d [m %x] ]
[ src-port %d [m %x] ]
[ dst-port %d [m %x] ]
[ spi %d [m %x] ]
[ vlan-etype %x [m %x] ]
[ vlan %x [m %x] ]
[ user-def %x [m %x] ]
[ dst-mac %x:%x:%x:%x:%x:%x [m %x:%x:%x:%x:%x:%x] ]
[ action %d ]
[ loc %d]] |
delete %d
ethtool -T|--show-time-stamping DEVNAME Show time stamping capabilities
ethtool -x|--show-rxfh-indir|--show-rxfh DEVNAME Show Rx flow hash indirection and/or hash key
ethtool -X|--set-rxfh-indir|--rxfh DEVNAME Set Rx flow hash indirection and/or hash key
[ equal N | weight W0 W1 ... ]
[ hkey %x:%x:%x:%x:%x:.... ]
ethtool -f|--flash DEVNAME Flash firmware image from the specified file to a region on the device
FILENAME [ REGION-NUMBER-TO-FLASH ]
ethtool -P|--show-permaddr DEVNAME Show permanent hardware address
ethtool -w|--get-dump DEVNAME Get dump flag, data
[ data FILENAME ]
ethtool -W|--set-dump DEVNAME Set dump flag of the device
N
ethtool -l|--show-channels DEVNAME Query Channels
ethtool -L|--set-channels DEVNAME Set Channels
[ rx N ]
[ tx N ]
[ other N ]
[ combined N ]
ethtool --show-priv-flags DEVNAME Query private flags
ethtool --set-priv-flags DEVNAME Set private flags
FLAG on|off ...
ethtool -m|--dump-module-eeprom|--module-info DEVNAME Query/Decode Module EEPROM information and optical diagnostics if available
[ raw on|off ]
[ hex on|off ]
[ offset N ]
[ length N ]
ethtool --show-eee DEVNAME Show EEE settings
ethtool --set-eee DEVNAME Set EEE settings
[ eee on|off ]
[ advertise %x ]
[ tx-lpi on|off ]
[ tx-timer %d ]
ethtool -h|--help Show this help
ethtool --version Show version numberThe corresponding parameter function introduction:
ethtool devname |--查询ethX网口基本设置
ethtool -a |--查看网卡中 接收模块RX、发送模块TX和Autonegotiate模块的状态：启动on 或 停用off。
ethtool -A |--修改网卡中 接收模块RX、发送模块TX和Autonegotiate模块的状态：启动on 或 停用off。
ethtool -c |--显示指定以太网卡的合并信息。
ethtool -C |--更改指定以太网卡的合并设置。
ethtool -g |--查看指定网卡的buffer size
ethtool -G |--更改指定网卡的buffer size
ethtool -i |--显示网卡驱动的信息，如驱动的名称、版本等。
ethtool -d |--显示register dump信息, 部分网卡驱动不支持该选项
ethtool -e |--显示EEPROM dump信息，部分网卡驱动不支持该选项
ethtool -E |--修改网卡EEPROM byte
ethtool -k |--显示网卡Offload参数的状态：on 或 off，包括rx-checksumming、tx-checksumming等。
ethtool -K |--修改网卡Offload参数的状态
ethtool -p |--用于区别不同ethX对应网卡的物理位置，常用的方法是使网卡port上的led不断的闪；N指示了网卡闪的持续时间，以秒为单位。
ethtool -P |--查看永久物理地址（mac地址）
ethtool -r |--如果auto-negotiation模块的状态为on，则restarts auto-negotiation
ethtool -S |--显示NIC- and driver-specific 的统计参数，如网卡接收/发送的字节数、接收/发送的广播包个数等。
ethtool -t |--让网卡执行自我检测，有两种模式：offline or online
ethtool -s |--修改网卡的部分配置，包括网卡速度、单工/全双工模式、mac地址、是否支持流控等- Examples of commonly used commands:
1.查看当前 eth1 网卡基本信息（查看网速、全/半双工、自协商等）：
ethtool eth1
2.查看当前 eth1 网卡驱动版本等信息：
ethtool -i eth1
3.修改当前 eth1 网卡的部分配置（修改网卡速度、单工/全双工模式、自协商等）
ethtool -s eth1 [speed 10|100|1000] [duplex half|full] [autoneg on|off]
4.查看当前 eth1 网卡某个寄存器设置：
ethtool -d eth1 | grep 0xX
5.查看当前 eth1 是哪个网卡（没插网线，板卡网卡比较多同时忘记是哪个网卡的情况下,使eth1闪烁10分钟）：
ethtool -p eth1 600
6.查看/设置当前 eth1 网卡的描述符缓冲区大小（rx ring、tx ring）
ethtool -g eth1
ethtool -G eth1 rx 4096
7.查看eth1网卡寄存器值
ethtool -d eth0- How to permanently save ethtool settings on network devices
Solution 1: The
ethtool settings can be saved in the /etc/sysconfig/network-scripts/ifcfg-ethX file to activate the options when the device is started next time.
For example: ethtool -s eth0 speed 100 duplex full autoneg off
This command sets the eth0 device to full duplex autonegation, and the speed is 100Mbs. To set these parameters when eth0 is started, modify the file /etc/sysconfig/network-scripts/ifcfg-eth0 and add the following line:
ETHTOOL_OPTS="speed 100 duplex full autoneg off"
ethtool is a powerful network management tool under Linux. There are countless articles introducing it. Some more detailed ethtool articles are listed as a supplement.
Linux network card driver support and implementation of ethtool: https://www.cnblogs.com/imapla/p/4575621.html