> 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? You can configure the ETHTOOL_OPTS option in the ifcfg files to automatically assign settings on startup. Regards, Simon