In this article, I will show you how to use ethtool command on Linux. I will be using Debian 9 Stretch for the demonstration. But any modern Linux distribution should work.

In most cases, ethtool should already be installed on your favorite Linux distribution. You can check whether ethtool is installed already with the following command:. If you see an error, then ethtool may not be installed on your computer. You can install ethtool very easily in your favorite Linux distribution. So it is really easy to install. You can install it very easily. You can display information about the network interface cards NICs connected to your computer with ethtool utility.

To do that, you need the network interface name of your network interface card NIC. On Linux, every network interface card NIC is assigned unique names such as eth0ens32 etc.

9 Linux ethtool Examples to Manipulate Ethernet Card (NIC Card)

First, find the assigned names of all the available network interfaces of your computer, with the following command:. As you can see, I have only two network interface cards NICs connected to my computer.

If you have more, it should show up here. The assigned names of my network interfaces are ens33 and enx00e04c42a3fe respectively. Yours should be different. But take a note of these as you will need it from now on. As you can see, a lot of information about the network interface card enx00e04c42a3fe is listed here. The currently used duplex mode and speed is displayed here as well.

As you can see, it is connected in full duplex mode at Mbps speed. You can also find out whether your NIC supports auto negotiation from here. As you can see, my enx00e04c42a3fe NIC is using Realtek r driver version 1.

Yours may be different. You can find out how many packets the NIC sent Tx or transmitted and received Rx or received using ethtool. You can also find out how many of these packets collided, transmission Tx errors and receiver errors Rx and many more. Making your NIC blink may sound useless.

But imagine a case where your computer has lots of network interfaces. How would you know which port is assigned what network interface name? Well, just blink each network interface and find out for yourself using ethtool.When you execute ethtool command with a device name, it displays the following information about the ethernet device.

This above ethtool output displays ethernet card properties such as speed, wake on, duplex and the link detection status. Following are the three types of duplexes available. You can disable this using autoneg option in the ethtool as shown below. Using ethtool you can change the speed of the ethernet device to work with the certain network devices, and the newly assign speed value should be within the limited capacity. Once you change the speed when the adapter is online, it automatically goes offline, and you need to bring it back online using ifup command.

When there is a problem with the network connection, you might want to check or change the ethernet device parameters explained in the above examples, when you see following issues in the output of ethtool command. Upon successful connection, the three parameters mentioned above gets appropriate values.

To capture and analyze packets from a specific network interface, use tcpdump utility. Let us assume that you have a machine with four ethernet adapters, and you want to identify the physical port of a particular ethernet card. For example, eth0.

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The above line should be the last line of the file. This will change speed, duplex and autoneg of eth2 device permanently. Include the below line as the last line in the corresponding eth1 adpater config file. I have a problem regarding the ethernet card. It gives the error as :Delying initialising, eth does not seem to present. I have to try it out on different systems. That will blink the LED for the interface for 30 seconds.

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CLI wont respond to you for 30 seconds while its doing it however. Hi, I would like to enable Interrupt coalescing in my code. I m getting broadcast storm at my network which i need to optimise using interrupt coalescing.

ethtool man

Notify me of followup comments via e-mail.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. Typically this involves blinking one or more LEDs on the specific network port.

N Length of time to perform phys-id, in seconds. All following options only apply if -s was specified. Autonegotiation is enabled by default, but in some network devices may have trouble with it, so you can disable it if really necessary. Currently only internal and external can be specified, in the future further types might be added. 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. This option clears all previous options. The argument to this option must be 6 bytes in Ethernet MAC hex format xx : yy : zz : aa : bb : cc. Sets the driver message type flags by name or number.

Configures the hash options for the specified network traffic type. When this option is set, all other options are ignored. By default, it prints out the dump flag, version and length of the dump data.

When data is indicated, then ethtool fetches the dump data and directs it to a file. Sets the receive flow hash indirection table to spread flows between receive queues according to the given weights. The sum of the weights must be non-zero and must not exceed the size of the indirection table.

By default this will flash all the regions on the adapter.

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N A number to identify flash region where the image should be flashed. Default region is 0 which denotes all regions in the flash.

ethtool man

Valid only for flow-type ether. Valid for all IPv4 based flow-types. Applies to all IPv4 based flow-types.To display the current parameters of the first network port eth0 :. Since[1] it's considered obsolete and replaced by ethtool. From Wikipedia, the free encyclopedia. The references in this article are unclear because of a lack of inline citations. Help Wikipedia improve by adding precise citations! December Learn how and when to remove this template message. This article does not cite any sources.

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By using this site, you agree to the Terms of Use and Privacy Policy. This network -related software article is a stub. You can help Wikipedia by expanding it.Ethtool advertise options: speed and mode of operation. This utility allows querying and changing settings such as speed, port, auto-negotiation, PCI locations and checksum offload on many network devices, especially Ethernet devices. We present here a short selection of often used ethtool commands together with some useful commands that are not well known.

For a full list of commands type ethtool -h or see the man page, ethtool 8for a more comprehensive list and explanation. The first two examples are information queries and show the use of the different formats of the command. For example eth0 or em1. The ethtool command with only a device name as an option is used to print the current settings of the specified device.

It takes the following form:. Some values can only be obtained when the command is run as root. Here is an example of the output when the command is run as root :. Issue the following command, using the short or long form of the argument, to query the specified network device for associated driver information:.

Here follows a list of command options to query, identify or reset the device. They are in the usual -short and --long form:. The --identify or -p option 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 specified network port. The --show-time-stamping or -T option queries the specified network device for time stamping parameters.

The --show-featuresor --show-offloador -k option queries the specified network device for the state of protocol offload and other features. The --test or -t option is used to perform tests on a Network Interface Card. Service will be interrupted.

Service should not be interrupted.

ethtool man

Changing some or all settings of the specified network device requires the -s or --change option.Today's Posts. Quick Links. Search Forums. Show Threads. Show Posts. 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. Typically this involves blinking one or more LEDs on the specific ethernet port. N Length of time to perform phys-id, in seconds. 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.

All following options only apply if -s was specified. Autonegotiation is enabled by deafult, but in some network devices may have trouble with it, so you can disable it if really necessary. Currently only internal and external can be specified, in the future further types might be added. Sets Wake-on-LAN options. Not all devices support this.

Ethtool Commands

The argument to this option is a string of characters specifying which options to enable. This option clears all previous options. The argument to this option must be 6 bytes in ethernet MAC hex format xx:yy:zz:aa:bb:cc. Meanings differ per driver. BUGS Not supported in part or whole on all ethernet drivers.

OpenSolaris Commands. Advanced Search. Unanswered Threads. Contact Us.Ethtool allows you to query and change your NIC settings such as the SpeedPortauto-negotiation and many other parameters.

In the examples below, we will show you how to install the " Ethtool " utility and demonstrate some basic functions that the tool can be used for. In the examples below we are using CentOS 7. Note: In Ubuntu No need to install. If you want to check to see if "Ethtool" is installed, you may issue the command: sudo apt-cache policy ethtool This command will display any installed versions of "Ethtool" found.

ethtool(8) - Linux man page

If you want to check to see if "ethtool" is already installed, then you can issue the command " yum list ethtool ". You can check this by issuing the command zypper se ethtool. If "ethtool" is installed a small "i" will be displayed in the first column of output.

Where Option can be none or more options. For example " eth0 ", " em1 " or " enp0s3 ". If you are unsure of the name of the interface on your system, you may issue one of the following commands " ifconfig -a or ip a s Both of these commands will display your systems interfaces. To display the version of Ethtool that is installed on your system, issue the command ethtool --version.

From the above we can see that version 4. If you issue the ethtool command with only the device name of your interface, then a list of the current settings will be displayed to your screen. From the above output we are able to see quickly important settings such as Speed, Auto Negotiation, Duplex settings and link detection status. Using the "ethtool" utility you can display the name of the device driver that is in use for the specified device:.

In the example above, the device name is "enp0s3" and the driver in use is "e". Additional firmware information will also be displayed. Using the "ethtool" utility you can display network statistics for your specified interface by using the option " --statistics " or " -S ". The above example output has been reduced for clarity. The "ethtool" utility gives you the ability to quickly change various settings on your interface.

Below are some examples using the " --change option. The "-s" option may also be used as the short-form version of the command. In the above example we specified a value for " speed ", " duplex " and " autoneg ".

For a full list of these values, it is worth consulting the man pages by issuing the commands: " man ethtool " or " ethtool --help ". It is possible to identify a given port on an interface by issuing the " --identify " or " -p " option. This option will typically blink the LED light of your interface.

In the above example the LED light will be illuminated for a period of 20 seconds on the specified interface.

ethtool man

Please note, this option is dependant on the type of interface and hardware. If you have made any change using the " Ethtool ", it is important to understand that by default, these changes will be lost after a system re-boot.

Ethtool - Linuxコマンド - Unixコマンド

However, it is possible to specify a script or command that can be run by adding entries into your start up scripts. However, on many systems it is also possible to specify options directly within the interface configuration file.

How to monitor Ethernet Activity using Arpwatch Tool

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