Hi, Not sure where this would fit in.
But I had some issues with IPv6 traffic, basically I had no communication other than ICMP. What seems to have solved it for me with was: # ethtool -K eth0 tx off I do not have this issue on the squeeze and wheezy installations I have running in LDOMs on the same machine. These two seem to have tx cheksumming off by default. I do see the same behaviour on my gentoo and oracle-linux installations. All of which is running kernel 4.X. Output from tcpdump. Noticeable difference seems to be the bad udp cksum. tx-checksumming: on 02:01:26.551180 AF IPv6 (28), length 100: (flowlabel 0xa7ea2, hlim 56, next-header UDP (17) payload length: 56) 2001:16d8:ffc0:0:214:4fff:fef8:82be.123 > 2001:16d8:eecb:0:21e:6ff:fec1:32a4.123: [bad udp cksum 0xc4a7 -> 0xd081!] NTPv4, length 48 Client, Leap indicator: clock unsynchronized (192), Stratum 0 (unspecified), poll 3 (8s), precision -6 Root Delay: 1.000000, Root dispersion: 1.000000, Reference-ID: (unspec) Reference Timestamp: 0.000000000 Originator Timestamp: 0.000000000 Receive Timestamp: 0.000000000 Transmit Timestamp: 3670358486.507984519 (2016/04/23 02:01:26) Originator - Receive Timestamp: 0.000000000 Originator - Transmit Timestamp: 3670358486.507984519 (2016/04/23 02:01:26) tx-checksumming: off 02:03:04.732493 AF IPv6 (28), length 100: (flowlabel 0xa7ea2, hlim 56, next-header UDP (17) payload length: 56) 2001:16d8:ffc0:0:214:4fff:fef8:82be.123 > 2001:16d8:eecb:0:21e:6ff:fec1:32a4.123: [udp sum ok] NTPv4, length 48 Client, Leap indicator: clock unsynchronized (192), Stratum 0 (unspecified), poll 3 (8s), precision -6 Root Delay: 1.000000, Root dispersion: 1.000000, Reference-ID: (unspec) Reference Timestamp: 0.000000000 Originator Timestamp: 0.000000000 Receive Timestamp: 0.000000000 Transmit Timestamp: 3670358584.688409149 (2016/04/23 02:03:04) Originator - Receive Timestamp: 0.000000000 Originator - Transmit Timestamp: 3670358584.688409149 (2016/04/23 02:03:04) 02:03:04.736695 AF IPv6 (28), length 100: (hlim 63, next-header UDP (17) payload length: 56) 2001:16d8:eecb:0:21e:6ff:fec1:32a4.123 > 2001:16d8:ffc0:0:214:4fff:fef8:82be.123: [udp sum ok] NTPv4, length 48 Server, Leap indicator: (0), Stratum 1 (primary reference), poll 3 (8s), precision -20 Root Delay: 0.000000, Root dispersion: 0.000289, Reference-ID: GPS^@ Reference Timestamp: 3670358580.663820624 (2016/04/23 02:03:00) Originator Timestamp: 3670358584.688409149 (2016/04/23 02:03:04) Receive Timestamp: 3670358584.755725264 (2016/04/23 02:03:04) Transmit Timestamp: 3670358584.755841612 (2016/04/23 02:03:04) Originator - Receive Timestamp: +0.067316092 Originator - Transmit Timestamp: +0.067432411 -kp
