To debug this issue requires more information, the log messages from avahi itself are simply a "symptom" of the fact the network address was deleted.
For any affected system we need to know (1) How your network is setup, e.g. /etc/network/interfaces, Network-Manager, etc. Plus a copy of the relevant configuration file. (2) A full copy of the syslog file when the issue occurred including at least a few hours before the issue. There may be some other log items such as related to DHCP etc. If you reboot, the logs may get rotated to /var/log/syslog.1 (3) It would be helpful to know that if you attempt to reconfigure the network, does it then work. e.g. if you do ifdown, then ifup. Or try a manual "dhclient eth0" (or whatever the interface name is) I am imagining two main scenarios here, either (a) You are using DHCP and the DHCP lease fails for some reason causing it to be removed from the interface. Perhaps dhclient fails, or the DHCP server is temporarily unavailable. Hopefully syslog might have some info there. (b) The network card itself stops passing traffic due to a driver bug.. given everyone is reporting issues on realtek this doesn't seem unlikely. To narrow that down we really need someone to try re- configure the IP, try adding an IP manually/statically and then running tcpdump to see if any traffic is hitting the machine. You could also try perhaps remove the kernel module and insert it again. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1586528 Title: Avahi-daemon withdraws address record Status in avahi package in Ubuntu: Invalid Status in network-manager package in Ubuntu: Confirmed Bug description: For some reason, if I leave my Ubuntu VM up for a prolonged period of time the machine will lose connection to the network. ip addr shows that the nic port no longer has an address and an examination of the syslog shows this: May 27 14:19:38 matt-VirtualBox avahi-daemon[590]: Withdrawing address record for 10.0.2.15 on enp0s3. May 27 14:19:38 matt-VirtualBox avahi-daemon[590]: Leaving mDNS multicast group on interface enp0s3.IPv4 with address 10.0.2.15. May 27 14:19:38 matt-VirtualBox avahi-daemon[590]: Interface enp0s3.IPv4 no longer relevant for mDNS. for no known reason. The only reliable way to get the network to come back (that I have found) is a full reboot. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: avahi-daemon 0.6.32~rc+dfsg-1ubuntu2 ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8 Uname: Linux 4.4.0-22-generic x86_64 ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 CurrentDesktop: Unity Date: Fri May 27 15:11:34 2016 InstallationDate: Installed on 2015-10-22 (218 days ago) InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) SourcePackage: avahi UpgradeStatus: Upgraded to xenial on 2016-03-30 (58 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1586528/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
