Questions tagged [ethtool]

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1answer
30 views

Is there any load when reading EEPROM inside SFP module?

I am trying to measure the optical receving/transmitting levels with ethtool on the server. It was confirmed that ethtool reads information from EEPROM inside the SFP module. When a read operation to ...
1
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1answer
42 views

Why NIC ring parameters are not pre-set at their Hardware max capabilities?

Check the NIC ring buffer: # ethtool -g eth0 Ring parameters for eth0: Pre-set maximums: RX: 4096 RX Mini: 0 RX Jumbo: 0 TX: 4096 Current hardware settings: RX: 256 RX ...
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1answer
111 views

Linux Link Speed Advertise

As far as I know, the following command would set the speed and duplex advertised by auto-negotiation. ethtool -s eth0 advertise 0x020 where 0x020 indicates 1000baseT Full according to the following ...
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0answers
47 views

What if command (ethtool) to flash physical ports on NIC does not work? How can I identify which of the live ports are flapping?

I have 2 live ports and one of which has network flapping issue. ethtool -p runs but does not flash my ports. What else can I do without pulling the wrong fiber?
1
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1answer
68 views

Should ethtool on one machine show different speed to the other machine?

I have two connected computers. On host A, ethtool shows a speed of 100Mb/s, but host B that is connected to it shows 10Mb/s. Why is this the case? On host B, the link partner advertised link mode is ...
0
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1answer
706 views

Can not disable autoneg via ethtool

I want to disable the auto-negotiation feature of NIC, I run the following command $sudo ethtool -s ens1f0 speed 10000 duplex full autoneg off Then I check if it takes effect via ethtool ens1f0: ...
0
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1answer
146 views

How to direct flows to specific vf queue?

SR-IOV allows us to create a VF from PF, now I want to direct some flows to VF via Flow Director. Here is ethtool help message action N Specifies the Rx queue to send packets to, or some other ...
1
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1answer
204 views

Wrong link speed; what happens if manually set speed using ethtool fails?

I've got a remote xen server and I noticed that the speed link in autoneg is 100 Full Duplex; all my network is 1000 Full Duplex; do you know any reason for this? Ethtool mentions on both my server ...
0
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1answer
2k views

how to verify status of TCP Segmentation Offloading

we do the following on linux rhel machines ethtool -K ifcfg-478476 tso off now lets say that we want to verify the settings how to do the check with ethtool or other cli? we try ethtool -k ifcfg-...
1
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1answer
2k views

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 ...
1
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1answer
547 views

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?
1
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1answer
12k views

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 ...
1
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0answers
424 views

Meaning of rx_fcs_errors

On my server I do see RX frame errors in ifconfig: eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 ether d0:50:99:30:f6:81 txqueuelen 1000 (Ethernet) RX packets ...
9
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2answers
715 views

nic: Something Wicked happened! ffff

I'm configuring a GNU/Linux Router with Debian Stretch (9.7) and before rebooting the server, all traffic from one interface to another was going ok, but after that, I received a message like this (...
3
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1answer
3k views

What does rx_csum_offload_errors mean?

I see too many rx_csum_offload_errors on ethtool output and it constantly increases. What is the reason of these errors and how can I fix it? # ethtool -S enp12s0f0 | grep error rx_errors: 0 ...
2
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2answers
5k views

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 ...
0
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1answer
85 views

What data is not available for tcpdump unlike interface statistics tools?

I'm analizing the logs on specific interface and wondering why this command during small load-test: tcpdump -i enp21s0f0 -s0 -w /tmp/dump2.cap` catched only 75 MB, when ethtool -S enp21s0f0 / ...
1
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0answers
265 views

What do the numbers in square brackets of ethtool output mean?

I'm looking at NIC statistics and can't find any info about these numbers: [0],[1]..[7] like here: [root@machine-1 ~]# ethtool -S enp21s0f0 NIC statistics: [0]: rx_bytes: 23048043995115 [0]:...
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0answers
496 views

Same ethernet cards, same firmware, same drivers ... different Advertising Mode

I have a strange issue. Having same cards, same drivers and same updated version of ethtool on 2 different OS, (XenServer7.* and centOS7.3). if I run on centOS ethtool on the card I get: Supported ...
0
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1answer
190 views

transfer rate faster than the NIC suggests

i followed this thread to get the information on reading NIC speeds. How do I verify the speed of my NIC? i am using ethtool to verify the speed of my NIC as discussed the thread. :~ # ethtool eth0 ...
8
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2answers
16k views

What does the ring parameter in ethtool -g output signify?

For instance, if I run ethtool -g eth0 on my system, I get the following output: Ring parameters for eth0: Pre-set maximums: RX: 4096 RX Mini: 0 RX Jumbo: 0 TX: ...
1
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1answer
14k views

how to change the auto-negotiation to yes in linux servers

when I run the ethtool command on eth0 ( on VM machine redhat version 6.7 ) I see Supports auto-negotiation: No can we change this to - auto-negotiation: yes ? , is it configurable? ethtool eth0 ...
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0answers
5k views

Cannot get current device settings: Operation not supported ethtool CentOS 7

Received an error "Cannot get current device settings: Operation not supported ethtool" while changing network speed using ethtool command on centos, # ethtool -s eth0 autoneg off speed 100 duplex ...
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1answer
6k views

ethtool error for limiting interface speed

i am limiting my bandwidth using ethtool and i used this command: sudo ethtool -s eth2 speed 500 But i got error message: Cannot advertise speed 500 i tried adding duplex half ...
0
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1answer
627 views

nic configuration on a linux virtual machine (rackspace)

I am trying to check my nic speed and duplex setting on a vm I have at rackspace. It is centos 6.4. When I run: # ethtool eth0 Settings for eth0: Link detected: yes This is all I get back. ...
1
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0answers
782 views

lxc / docker wake on lan?

Has anyone successfully implemented "wake on LAN" functionality in a linux container? In my setup each client has his own container for a vpn, but I only want the container to "boot up" when the ...
0
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0answers
347 views

Alternative ways to track dropped packets and report output

Instead of tailing /var/log/messages or doing a continuous ping is there a way with ifconfig or ethtool to track dropped packets, collisions, or tx/rx errors in real time?
2
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1answer
11k views

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 ...
7
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1answer
7k views

meaning of rx_queue_*_csum_err and rx_fifo_errors

I am trying to debug some networking issue with one server. I monitor this machine with multiple monitors and I see that at times ping error rate jumps to 5/10% I am running on ubuntu and I see that ...
2
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0answers
6k views

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: ...
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1answer
816 views

How to change the setting for a network device reported by ethtool, specifically Speed, on VM?

This is related to these two questions, although they don't answer my question. The machines are RHEL6. 1.ethtool not showing all the properties 2.changing network speed to 1000Mb/s Output on VM: ...
2
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2answers
8k views

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 ...
10
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1answer
9k views

ethtool says that eth0 uses MII but twisted pair is used

ethtool says that "Supported ports: [ TP MII ]" and "Port: MII". I guess that TP means twisted pair and Media Independent Interface. However physically I see that network card uses twisted pair cable, ...
2
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2answers
2k views

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 ...
0
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1answer
628 views

Extremely slow network and half duplex

I am having an extremely slow network netperf -H 11.x.x.21 TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 11.x.x.21 (11.x.x.19) port 0 AF_INET Recv Send Send Socket Socket Message ...
1
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1answer
6k views

Can't set NIC speed to 10Gbps using ethtool

We're using IBM Blade Center HS-22 servers with Broadcom NetXtreme II 10Gbps NICs to a Nortel 10Gbps switch. With one of the chassis the NICs can establish a 10G rate with the command "ethtool eth2 ...
11
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2answers
2k views

packet queue performance discrepencies with BIND nameserver

Background: I've inherited a high volume caching nameserver environment (Redhat Enterprise Linux 5.8, IBM System x3550) that has inconsistent ring buffer settings: 1020 for eth0 and 255 for eth1. ...
22
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8answers
50k views

How to persist ethtool settings through reboot

I would like to turn off tcp segmentation offload on a CentOS5 server. Using ethtool the command is ethtool -K eth0 tso off However, this setting only persists for this session. How can I make it ...
3
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1answer
337 views

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, ...
7
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3answers
23k views

Why is ethtool not showing me all the properties for a NIC?

CentOS 5.8 | VMWare ESX 5.1 When I run ethtool eth0 I see the following: [root@foo ~]# ethtool eth0 Settings for eth0: Current message level: 0x00000007 (7) Link detected: yes Is ...
2
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1answer
697 views

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 ...
1
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1answer
12k views

changing network speed to 1000Mb/s

I am trying to change the server uplink from 100Mb/s to 1000Mb/s ethtool eth0 output # ethtool eth0 Settings for eth0: Supported ports: [ TP MII ] Supported link modes: ...
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2answers
2k views

"Speed Mismatch" between 1000T and 10000T?

I have a server in a data center, which has an Ethernet NIC card with Fibre support. I have a 1Gbps connection and my ISP asked me to make sure the settings on my device are as follows: Full Duplex, ...
6
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2answers
32k views

debian set eth0 autoneg off speed 1000 duplex full: Invalid argument

I use debian for my things,but when i config speed 1000 and duplex full the error occur the exactly command i use: ethtool -s eth0 autoneg off speed 1000 duplex full Cannot set new settings: ...
0
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2answers
874 views

RedHat 5: HP Server ethtool not working

I am trying to check/change my network card speed settings with RedHat 5 and a Proliant G6 server from HP. On eth0 I can not really use ethtool - it just says Link detected. The network card is a ...
8
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1answer
41k views

Can't set up NIC to establish Gigabit link on Linux

I have Ubuntu 11.10 64 bits with one (actually two, but only one is connected) Intel 82578 Gigabit Network Card which is working on 100 Mbps and I want it to work on 1000 Mbps, but I can't. How can I ...
3
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1answer
2k views

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 /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 ONBOOT=yes BOOTPROTO=static ...
2
votes
2answers
8k views

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? ...
161
votes
8answers
503k views

How do I verify the speed of my NIC?

I just installed a new gigabit network interface card (NIC) in Linux. How do I tell if it is really set to gigabit speeds? I see ethtool has an option to set the speed, but I can't seem to figure ...
1
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0answers
2k views

Cannot enable WOL in Ubuntu using ethtool

I'm trying to build a linux box that will run without a monitor or keyboard, runs Ubuntu server, will go into suspend after a certain amount of time and is able to be woken up through network ...