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 Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1342400 Title: avahi-daemon constantly reporting "Invalid response packet from host" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1342400/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
