@hui.wang - yes, I have seen this a few times in Focal since upgrading about a month ago. I didn't look at the logs closely, but the message that appears repeatedly after the interface fails is "eth0: kevent 0 may have been dropped" I think, and bug #1647397 may be related/identical.
User from that bug ascribes the cause to the use of bridge, and this is my case. @Matt, are you also running the interface in a bridge? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1861936 Title: Raspberry Pi 3 network dies shortly after a burst of IPv6 tunnel network load ((lan78xx): transmit queue 0 timed out) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1861936/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
