[CentOS] bad udp cksum
lacibsd at gmail.com
Fri Aug 10 15:48:24 UTC 2018
I could, however that is going to increase the CPU load, mostly under heavy
On Fri, Aug 10, 2018 at 3:34 AM, Simon Matter <simon.matter at invoca.ch>
> > Hi,
> > Recently I'm noticing an interesting issue.
> > My CentOS servers are trying to send logs to a logging server via
> > 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
> > virtual server (they also use different hardware and NIC's)
> > Of course I could run ethtool every time a server starts but I think
> > should be a better solution. Also I enjoy having TCO giving some rest to
> > the CPUs.
> > Did anyone find a solution for this?
> You can configure the ETHTOOL_OPTS option in the ifcfg files to
> automatically assign settings on startup.
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