This bug has been raised with Avahi as http://avahi.org/ticket/352 but there doesn't seem to have been any action on this in 4 years. I'm going to contact them. I've got tcpdump's of the packets.
I'm seeing these apparently bad packets come from a Windows 10 pre- release build 10240 machine. I guess I'm going to see a lot more with Windows 10 being offically released on 29/7/2015. These messages are appearing in syslog for my machines: Ubuntu 12.04 avahi-daemon 0.6.30-5ubuntu2 Ubuntu 14.04 avahi-daemon 0.6.31-4ubuntu1 Looks like server.c code used in Ubuntu Wily 15.04 has not had the patch above applied. See http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/wily/avahi/wily/view/head:/avahi-core/server.c Vivid 14.10 + Wily 15.04 both use 0.6.31-4ubuntu4. Turning off IPv6 (leaving IPv4 on), on the Windows 10 machine stops the messages. ** Bug watch added: Avahi Bugs #352 http://www.avahi.org/ticket/352 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to avahi in Ubuntu. https://bugs.launchpad.net/bugs/1342400 Title: avahi-daemon constantly reporting "Invalid response packet from host" Status in avahi package in Ubuntu: Confirmed Bug description: After installing Ubuntu 14.04 (Release: 14.04) and looking for other information in /var/log/syslog, I see that syslog is being flooded by "Invalid response packet from host" messages from avahi-daemon. I searched around to see why this might be and ran across the following avahi mailing list post along with a patch to fix it: http://lists.freedesktop.org/archives/avahi/2012-July/002171.html >>> I would say you can safely ignore it, since any machine on your network running a recent OSX version will cause these messages. Here's a patch with what we change to avoid these messages flooding syslog. -Justin <<< The patch which fixes this is here: http://lists.freedesktop.org/archives/avahi/attachments/20120719/1e71846e/attachment.obj To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1342400/+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
