To display the current parameters of the first network port eth0 :.
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ethtool: Linux Command/Unix Command
Let's take this list of packages for instance: emacs, gimp, gcc, mutt, grub, kyle rankin, parted, tar, mutt, vim. Nine times out of ten, a common person is going to look at that list and become utterly confused over what package does what. That's just the beauty and beast of naming software in the open source community. But every so often a tool comes across my screen with such a blatantly obvious name that I just have to run a 'man' to make sure my eyes are not deceiving me.
In this case, it's ethtool. Yes, a simple name, for such a powerful utility. The name itself tells you what it does, an Ethernet Tool. That's it, ethernet tool. What Ethtool does is allows you to modify your Ethernet adapter settings inside of Linux.
What I'll be writing about today isn't the nitty gritty of ethernet adaptors coalesce, setting rings, register dumping, etc.Inclusion / exclusion x inclusione vs esclusione, alle gallerie
But what I will address are some really nifty tips and tricks I have learned over the last decade or so. So without further adieu, let's get started. First things first we need to determine what Ethernet adaptor you are using.
Keep in mind though, ethtool will only work against physical ethernet adapters. This means that bond0, tun0, and any other network device that is not a physical network device will not work with ethtool. Now that you know your device, lets have some fun, shall we? Note: Most linux kernels mark ethernet devices as ethX, where X is the starting at 0 of the physical Ethernet interface. I know I know, start with the least used things first.
But hey, someone might find this useful, right?
By running the following command you will get statistics about your network card. From here you can see a list of transmitted, received and errored packets. This can be useful during network troubleshooting, combined with other network utilities such as tcpdump. I'm sure this has happened to many of you, as I know it has happened to me. Ever had a server with more than 2 network cards?
Raise your hand. Ever had more than two? Ever had to trace what physical network card was recorded in linux as ethX? Sure, you could do it the hard way: grab the MAC address off of ifconfig, plug all the cables into a managed switch and then dump the tables on the switch to find what MAC address goes where.
Or, follow the blinking lights with ethtool.This family does not use a specific header, all information in requests and replies is passed using netlink attributes.
The ethtool netlink interface uses extended ACK for error and warning reporting, userspace application developers are encouraged to make these messages available to user in a suitable way.
In some cases, the request as such is allowed for anyone but unprivileged users have attributes with sensitive information e. This implements an array of entries. Each request or reply message contains a nested attribute with common header. Structure of this header is. One of them is sufficient in requests, if both are used, they must identify the same device. Some requests, e. Most GET requests also allow dump requests without device identification to query the same information for all devices providing it each device in a separate message.
The interpretation of these flags is the same for all request types but the flags may not apply to requests. Recognized flags are:.Stm32 usb adc
New request flags should follow the general idea that if the flag is not set, the behaviour is backward compatible, i. A client must not set flags it does not understand. For arbitrary length bitmaps, ethtool netlink uses a nested attribute with contents of one of two forms: compact two binary bitmaps representing bit values and mask of affected bits and bit-by-bit list of bits identified by either index or name.
Verbose bit-by-bit bitsets allow sending symbolic names for bits together with their values which saves a round trip when the bitset is passed in a request or at least a second request when the bitset is in a reply. This is useful for one shot applications like traditional ethtool command. On the other hand, long running applications like ethtool monitor displaying notifications or network management daemons may prefer fetching the names only once and using compact form to save message size.
Notifications from ethtool netlink interface always use compact form for bitsets. In requests modifying a bitmap, the former changes the bit set in mask to values set in value and preserves the rest; the latter sets the bits set in the bitmap and clears the rest. They consist of bit words in host byte order, words ordered from least significant to most significant i.
Kernel bit set length may differ from userspace length if older application is used on newer kernel or vice versa. If userspace bitmap is longer, an error is issued only if the request actually tries to set values of some bits not recognized by kernel.
Bit size is optional for bit-by-bit form. A bit may be identified by its index or by its name. A request fails if index exceeds kernel bit length or if name is not recognized.Tag Description -h --help Shows a short help message. 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. 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. 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. Retrieves and prints a register dump for the specified ethernet device.
Initiates adapter-specific action intended to enable an operator to easily identify the adapter by sight. Executes adapter selftest on the specified ethernet device.
Possible test modes are:. Allows changing some or all settings of the specified ethernet device. Specifies whether autonegotiation should be enabled. Sets the speed and duplex advertised by autonegotiation. Selects transceiver type. Tag Description p.
Sets the SecureOn tm password.Use the ethtool command in Linux to display or change the settings of your Ethernet device. The device name is usually rendered as ethXwith X referencing the number of the device.Jenkins retry example
The default Ethernet device is usually rendered as eth0. To change the settings for the specified Ethernet device, enter the command ethtool -s with the following switches:. Linux Switching from Windows.
Tweet Share Email. Use the following switches to modify the command's function:. This involves blinking one or more LEDs on the specific Ethernet port. N : The length of time to perform phys-id, in seconds. Offline performs a full set of tests and may cause normal operation interruption during the tests. Online performs a limited set of tests, and doesn't interrupt normal adapter operation. In the usual case it is, but might cause problems with some network devices, so you can turn it off.
Currently only internal and external can be specified, in the future further types might be added. 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. Meanings differ per driver. More from Lifewire.It provides simple and fast way to get and set configuration about IP address, interface speed, interface duplex or half duplex etc.
We will start with simply listing given network interface properties.
ethtool Commands and Examples
We will see that there is a lot of network interface properties which is outputted by ethtool. For this operation we do not need to provide any option. Network Interfaces are managed and used with drivers. Drivers are operating system level modules which is the same for network interface cards with same chipset. As stated previously auto-negotiation is used to determine link speed of the network interface transmitter. The other end of the link is another factor for link speed.Ngk bpr9es napa
We can enable auto-negotiation for talk the link speed with the remote host and set the best speed for the link. Network statistics provides useful information about network utilization of the system. We can change auto-negotiation of the given network interface card.The Linux Shack - Bonded Network Interfaces (ifenslave & ethtool)
We need root privileges becauase of system level chages. We can change the speed of the network interface card. This can be useful if remote interface do not supports auto-negotiation or there are link speed related problems.
Also disabling auto-negotiation is good practice. As we know network interface cards have some leds to give information about traffic and link. We can blink these leds by using ethtool. This may be useful if we need to blink leds to specify network interface card. After a system reboot all configurations will be reset. But we can make these configuration permanent in order to save configuration time.
Now GRO which is a linux network stack feature can be disabled using 'ethtool -k ethx gro off'. Is that available for LRO as well? It should prevent the system from performing lro.
However, many of the drivers which still use LRO are broken and do not honor ethtool. Learn more. Disabling LRO using ethtool? Ask Question. Asked 8 years, 10 months ago. Active 8 years, 10 months ago. Viewed 22k times. For readers: LRO stands for Large receive offload. And just fyi, there are issues with this in non linux protocol stacks too. As the checksum is not recalculated at least with gro this was the case certain network stacks like cisco's tcp will check the checksum and not be lenient like linux tcp is and ignore the error.
Active Oldest Votes.
Yes, if your ethtool is new enough. Nemo Nemo Seth Robertson Seth Robertson 26k 4 4 gold badges 51 51 silver badges 49 49 bronze badges. This is wrong, -k lower case shows the settings. Nemo's answers is the proper usage.
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