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Questions tagged [ethtool]

62 questions
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4 answers

Disable TCP checksum offloading on KVM virtual network

I have a virtual network for connecting KVM guests with the host. I need to disable TCP checksum offloading on this network. The ethtool works fine but I want to disable it permanently and I could not find anything in virsh or QEMU documentation.…
jackhab
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1 answer

Why is my bandwidth averaging 3 kbps on a 10 mbps device?

I have a server with a 100 mbps port and connection that I rate limited to 10 mbps/full duplex because I am only paying for a 10 mbps connection and there are steep overage charges. Ever since then, the bandwidth has absolutely plummeted. I turned…
compucuke
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1 answer

Why is mii-tool saying duplex is half while ethtool is saying duplex is full?

CentOS 5.x I configured my CenTOS server to use full duplex. I did this by editing the network script: more…
Mike B
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1 answer

Where to find list of possible arguments for ethtool -K?

When I want to disable/enable interface features with the ethtool -K command, how can I list all available options? When I run ethtool -k I see a list of options, but I don't know the equivalent ethtool -K name for each one. My man page shows the…
snowsnoot
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1 answer

Collecting SFP+ attributes in Linux

I need to collect hw component inventory from physical systems running RHEL (6 and 7) and its derivatives. I need to collect the SFP+ attributes along with the rest of the components. I know I can easily get this with ethtool, as long as the…
Lubos A.
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2 answers

Changing network interface speed with ethtool is not working

Im using lenevo M5 server which have Gbps ethernet cards, but strangely when i read cat /sys/class/net/eth3/speed it show 100 similarly when using ethtool it show 100Mbps only.The output of dmesg and ethtool are below. Any idea why is…
sherpaurgen
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1 answer

Unable to set eth0 autoneg off speed 1000 duplex full : invalid argument

I use Ubuntu server for my things,but when i config speed 1000 and duplex full the error occur. I've tried the answers from here,does not work, the command i used is ethtool -s eth0 speed 100 duplex full Before this happened I changed my network…
amrino
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Cannot set 1G speed on 10G nic using ethtool

I have a linux server with 10G fibre nics: xyz@xyz48:~$ sudo ethtool p1p1 Settings for p1p1: Supported ports: [ FIBRE ] Supported link modes: 10000baseT/Full Supported pause frame use: No Supports auto-negotiation: No …
Akshya11235
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2 answers

How to detect ethernet uplink speed on CentOS 6 OpenVZ VPS

I recently purchased a VPS which was advertised as a 100Mbps uplink but the promotion promised a free upgrade to a 1Gbps uplink. I'm trying to find out if I received the upgrade with various methods without any luck. Running lspci I get: [root@host…
SSpoke
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3 answers

How to get ethtool wake-on-lan setting to "stick"?

I have a couple of machines in my server room normally powered off which it's useful to be able to power up remotely. One of them is an old dual-P3 IBM serverWorks Intel STL2 machine on which wake-on-LAN has performed flawlessly for years. I hit…
timday
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1 answer

some nodes in a cluster has higher frame value in ifconfig

I am running a cluster consisting of 22 nodes. (22 nodes under the same 1Gbps switch.) I noticed some nodes in the cluster has higher "frame" value in ifconfig like the following. some nodes (higher frame): eth0 Link encap:Ethernet HWaddr…
hiroyuki
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2 answers

What does a high number of rx_crc_errors indicate?

When running ethtool I notice a very high level of rx_crc_errors. When the server is under heavy load the counter goes even higher. What does this typically point to as the source of the problem? Media or cable issues?
Graham Zulauf
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2 answers

What does "sudo ethtool -K tx-checksum-ip-generic off" do exactly? Should I be worried about turning it off?

Recently upgraded to Debian 11 bullseye, and our Docker swarm nodes had trouble talking to each other, and started dropping some connections. After much Google-ing, we stumbled on these…
Keith Palmer Jr.
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1 answer

When using ethtool -S what is the difference between rx_packets and rx_pkts_nic?

rx_packets are much larger than rx_pkts_nic. Why is this the case? Is there a doc somewhere with explanation of all the NIC stat fields?
jjdiaz
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Meaning of rx_fcs_errors

On my server I do see RX frame errors in ifconfig: eth0: flags=4163 mtu 1500 ether d0:50:99:30:f6:81 txqueuelen 1000 (Ethernet) RX packets 11604295 bytes 3261247616 (3.0 GiB) RX errors 7339…
Stefan
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