[Bug 1586528] Re: Avahi-daemon withdraws address record

[Claudio Kuenzler]

I've just seen this issue the first time on a Ubuntu 20.04 (updated
several months ago from 16.04) AWS EC2 machine. Looking closer into
this, the machine lost its IP address multiple times in the last hours.
The following avahi-daemon log messages made me find this bug report:

ck at focal:~$ grep avahi-daemon /var/log/syslog | grep -i withdrawing
Jan 18 20:17:42 inf-mon04-p avahi-daemon[941]: Withdrawing address record for 10.10.1.41 on eth0.
Jan 18 21:44:52 inf-mon04-p avahi-daemon[941]: Withdrawing address record for 10.10.1.41 on eth0.

It's very interesting, that both of these events happened EXACTLY one
hour after the system boot:

ck at focal:~$ last | head
ck       pts/0        xx.xx.xx.xxx     Tue Jan 18 22:11   still logged in
root     ttyS0                         Tue Jan 18 21:50   still logged in
reboot   system boot  5.4.0-91-generic Tue Jan 18 20:44   still running
reboot   system boot  5.4.0-91-generic Tue Jan 18 19:17 - 20:39  (01:22)

Running "dhclient" on the EC2 console, as suggested in comment #46, re-
assigns the IP address.

Relevant versions installed:

ck at focal:~$ dpkg -l|egrep "(dhcp|network-manager)"
ii  isc-dhcp-client                      4.4.1-2.1ubuntu5.20.04.2              amd64        DHCP client for automatically obtaining an IP address
ii  isc-dhcp-common                      4.4.1-2.1ubuntu5.20.04.2              amd64        common manpages relevant to all of the isc-dhcp packages
ii  network-manager                      1.22.10-1ubuntu2.2                    amd64        network management framework (daemon and userspace tools)
ii  network-manager-gnome                1.8.24-1ubuntu3                       amd64        network management framework (GNOME frontend)
ii  network-manager-pptp                 1.2.8-2                               amd64        network management framework (PPTP plugin core)

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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)

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