Questions tagged [ethtool]
The ethtool tag has no usage guidance.
61
questions
-2
votes
0
answers
37
views
ethtool -m in windows (SFP Digital Optical Monitoring - DOM) [migrated]
I am running 10 Gbit optical link on Intel X520 on Windows in home lab. I plan to do some experiments with the fiber and it would be interesting to see SFP transceiver Digital Optical Monitoring (DOM) ...
- 710
0
votes
0
answers
32
views
Why does connectivity differ for straight and crossover cabling towards 1Gbit MDI-X capable switch (from Linux OS)?
There's no constraint with directly connecting a Realtek 1000/100/10Mbit transceiver towards a common router.
There was no connection ('Could not activate connection: Connection 'Name of Lan ...
- 11
0
votes
2
answers
256
views
Unable to ping other devices in the network through ethernet port on a custom board
I am on a embedded development platform and trying to bring up the ethernet and do a ping test.
As of now, I have the ethernet up after the linux boot, but I am unable to ping other systems. My ...
- 101
0
votes
0
answers
252
views
Is there a network card that lets you set "master slave" mode in Linux?
I am trying to locate an ethernet network card that allows for the setting of the master slave mode. Ethtool add this configuration (ethtool -s master-slave ) but I can't find a card that supports ...
- 151
0
votes
0
answers
149
views
How to view current PHY master-slave settings in Linux (Centos Stream)
I am trying to view the current master-slave settings on my network cards (HPs with Intel controllers).
I see ethtool has the master-slave option to set the mode, but I didn't see how to view the ...
- 151
0
votes
1
answer
173
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
4
votes
1
answer
1k
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 ...
- 369
0
votes
1
answer
3k
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 ...
- 45
0
votes
0
answers
83
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
1
vote
1
answer
185
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 ...
- 121
0
votes
1
answer
2k
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:
...
- 3
0
votes
1
answer
279
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 ...
- 3
1
vote
1
answer
602
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 ...
- 33
1
vote
1
answer
4k
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-...
- 463
2
votes
1
answer
3k
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 ...
- 21
1
vote
1
answer
954
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?
- 11
2
votes
1
answer
21k
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 ...
- 35
1
vote
0
answers
565
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 ...
- 21
9
votes
2
answers
754
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 (...
- 1,583
3
votes
1
answer
4k
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
...
- 431
2
votes
2
answers
7k
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 ...
- 616
0
votes
1
answer
120
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 / ...
- 21
2
votes
0
answers
305
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]:...
- 21
0
votes
0
answers
600
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 ...
- 143
0
votes
1
answer
223
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
...
- 979
9
votes
2
answers
20k
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: ...
- 174
1
vote
1
answer
16k
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
...
- 1,031
0
votes
0
answers
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 ...
- 121
-2
votes
1
answer
7k
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
...
- 3
0
votes
1
answer
679
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.
...
- 177
1
vote
0
answers
891
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 ...
- 88
0
votes
0
answers
358
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?
- 619
2
votes
1
answer
13k
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 ...
- 33
7
votes
1
answer
8k
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 ...
- 173
2
votes
0
answers
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: ...
- 133
0
votes
1
answer
901
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:
...
- 101
2
votes
3
answers
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 ...
- 751
10
votes
1
answer
10k
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, ...
- 247
2
votes
2
answers
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 ...
- 161
0
votes
1
answer
685
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 ...
- 757
1
vote
1
answer
7k
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 ...
- 111
11
votes
2
answers
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. ...
- 32.2k
25
votes
8
answers
57k
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 ...
- 561
3
votes
1
answer
350
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, ...
- 41
9
votes
3
answers
26k
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 ...
- 11.8k
2
votes
1
answer
764
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 ...
- 21
1
vote
1
answer
14k
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: ...
- 205
-1
votes
2
answers
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, ...
- 103
6
votes
2
answers
34k
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: ...
- 125
0
votes
2
answers
894
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 ...
- 343