Ok I have done some more investigation and seems like I found it. I went through syslog in range of 2 minutes before and after bug notice (which I controlled with ping). I did this for 4 times to reduce possibility of something missing.
Really do not know why I did not noticed this earlier, but I think there was too much "<info>" debug messages that I considered it as "normal" obviously: There are never ending cycles about exchanging IPv6 addresses: ---------------------------------------------------------------------------------------------------------------------------- [nm-ip6-manager.c:1340] netlink_notification(): netlink event type 20 [nm-ip6-manager.c:885] process_address_change(): (eth0): address cache size: 6 -> 6: [nm-ip6-manager.c:835] dump_address_change(): (eth0) new address: <IPv6 address 1> [nm-ip6-manager.c:1340] netlink_notification(): netlink event type 20 [nm-ip6-manager.c:885] process_address_change(): (eth0): address cache size: 6 -> 6: [nm-ip6-manager.c:835] dump_address_change(): (eth0) new address: <IPv6 address 2> [nm-ip6-manager.c:1340] netlink_notification(): netlink event type 52 Between that, there are also this messages (in any pattern I could notice): ---------------------------------------------------------------------------------------------------------------------------- [nm-ip6-manager.c:1340] netlink_notification(): netlink event type 24 [nm-ip6-manager.c:1340] netlink_notification(): netlink event type 25 And finally, in time of bug occurs (+/- 5 seconds) there is this particular message: ---------------------------------------------------------------------------------------------------------------------------- [nm-netlink-monitor.c:167] link_msg_handler(): netlink link message: iface idx 3 flags 0x1003 This message just brought me there: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=657495 and it seems be related. So I read it and disabled IPv6 in sysctl.conf. All <"info"> debug messages are gone. Will report definitely later if it helped but seems so. This also explains why I did not noticed nothing in Precise, because I remember I disabled IPv6 before this bug has been discovered. Cannot recall reason, but I'm pretty sure. I haven't found this bug on launchpad, but I think description should be modified to reflect this investigation. Thank you for "psychically" force me to check this again, I was about to buy router as a workaround :P -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1129251 Title: Ethernet connection - damaged packets To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1129251/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
