Well, it is in general a good idea to disable all the fancy nic feature like tso, gro, rx/tx offload if strange things happen
-----Ursprüngliche Nachricht-----
Von: CentOS <centos-bounces@xxxxxxxxxx> Im Auftrag von Eliezer Croitoru
Gesendet: Donnerstag, 6. September 2018 13:51
An: 'CentOS mailing list' <centos@xxxxxxxxxx>
Betreff: Re: bad udp cksum
I have seen such and issue but it depends on the environment structure.
I have seen it mostly on VM's and it was resolved.
The hardware and software details of the setup might help to understand what's causing it.
Eliezer
----
Eliezer Croitoru
Linux System Administrator
Mobile: +972-5-28704261
Email: eliezer@xxxxxxxxxxxx
-----Original Message-----
From: CentOS [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of Laszlo Danielisz
Sent: Thursday, August 9, 2018 9:53 PM
To: centos@xxxxxxxxxx
Subject: bad udp cksum
Hi,
Recently I'm noticing an interesting issue.
My CentOS servers are trying to send logs to a logging server via 514/udp, however I'm not receiving anything.
I did the following on CentOS
*tcpdump -vvv -nn udp -i esn160 port 514*
In another session on the same server:
*nc syslog-server -u 514*
tcpdump started to show me messages like:
*[bad udp cksum 0x3ce9 -> 0xb0f5!] SYSLOG, length: 172*
After some research I disabled TCO (ethtool -K ens160 tx off rx off), now tcpdump shows:
*[udp sum ok] [|syslog]*
And I'm also receiving the logs. Yay!
I have the same issue on multiple servers with CentOS versions 7.3.1611,
7.4.1708 & 7.5.1804. I'm having the issue no matter if it is a physical or virtual server (they also use different hardware and NIC's)
Of course I could run ethtool every time a server starts but I think there should be a better solution. Also I enjoy having TCO giving some rest to the CPUs.
Did anyone find a solution for this?
Thanks!
Laszlo
_______________________________________________
CentOS mailing list
CentOS@xxxxxxxxxx
https://lists.centos.org/mailman/listinfo/centos
_______________________________________________
CentOS mailing list
CentOS@xxxxxxxxxx
https://lists.centos.org/mailman/listinfo/centos
________________________________
financial.com AG
Munich Head Office/Hauptsitz München: Georg-Muche-Straße 3 | 80807 Munich | Germany | Tel. +49 89 318528-0 | Google Maps: https://goo.gl/maps/UHwj9
Frankfurt Branch Office/Niederlassung Frankfurt: Messeturm | Friedrich-Ebert-Anlage 49 | 60327 Frankfurt am Main | Germany | Google Maps: https://goo.gl/maps/oSGjR
Management Board/Vorstand: Dr. Steffen Böhnert | Dr. Alexis Eisenhofer | Dr. Yann Samson
Supervisory Board/Aufsichtsrat: Werner Engelhardt (Chairman/Vorsitzender), Eric Wasescha (Deputy Chairman/Stellv. Vorsitzender), Franz Baur
Register Court/Handelsregister: Munich – HRB 128972 | Sales Tax ID Number/St.Nr.: DE205370553
_______________________________________________
CentOS mailing list
CentOS@xxxxxxxxxx
https://lists.centos.org/mailman/listinfo/centos
