[Bug 1698248] Re: avahi-daemon constantly registers/withdraws IPv6 address record

[Chris Bainbridge]

On my network, tcpdump suggests this happened in response to the router
sending an IPv6 router advertisement every few minutes, and was stopped
after:

  ip6tables -A INPUT -p icmpv6 --icmpv6-type router-advertisement -j
DROP

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Title:
  avahi-daemon constantly registers/withdraws IPv6 address record

Status in avahi package in Ubuntu:
  Confirmed

Bug description:
  Running Ubuntu 17.04, have avahi-daemon 0.6.32-1ubuntu1 installed.

  If I check syslog, every 5 - 10 seconds there is a set of messages
  like message like:

  Jun 15 20:53:01 dan-pc avahi-daemon[6673]: Registering new address record for 2001:1970:5ea2:c101:a899:2dfa:5a35:61fd on enp0s31f6.*.
  Jun 15 20:53:01 dan-pc avahi-daemon[6673]: Registering new address record for 2001:1970:5ea2:c101:64ee:d405:6df8:900a on enp0s31f6.*.
  Jun 15 20:53:01 dan-pc avahi-daemon[6673]: Withdrawing address record for 2001:1970:5ea2:c101:64ee:d405:6df8:900a on enp0s31f6.
  Jun 15 20:53:01 dan-pc avahi-daemon[6673]: Withdrawing address record for 2001:1970:5ea2:c101:a899:2dfa:5a35:61fd on enp0s31f6.

  etc..., which is clearly not normal. (This was also tested on a brand
  new installation of Ubuntu 17.04, same issue). Attached is a small
  sample of my syslog file.

  This also seems to impact other programs that use an ipv6 connection.
  For example, Google Chrome - half the time I try to load a webpage I
  get "your connection was interrupted; a network change was detected".
  After about a half-second, it proceeds to load the webpage, although
  often doesn't load it properly. This does not affect all websites
  (likely only those that support ipv6).

  See https://askubuntu.com/questions/905866/new-ubuntu-17-04-problem-
  your-connection-was-interrupted for other people experiencing the same
  bug, both in avahi and Chrome.

  Disabling ipv6 seems to work as a temporary workaround.

  I am also not sure whether this bug is caused by avahi, or whether it
  is just experiencing the most "symptoms".

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: avahi-daemon 0.6.32-1ubuntu1
  ProcVersionSignature: Ubuntu 4.10.0-22.24-generic 4.10.15
  Uname: Linux 4.10.0-22-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.4-0ubuntu4.1
  Architecture: amd64
  CurrentDesktop: X-Cinnamon
  Date: Thu Jun 15 20:42:19 2017
  InstallationDate: Installed on 2017-06-10 (5 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  SourcePackage: avahi
  UpgradeStatus: No upgrade log present (probably fresh install)

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