This is really an upstream bug but it looks like upstream is a bit inactive and, then, it's unresolved still. I am getting lots of messages like: avahi-daemon[401]: Invalid response packet from host People in https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1342400 wonder if maybe this is caused by some new Windows 10 or latest Mac OS X computers running around, but looks like they still couldn't find a real fix for this :S http://avahi.org/ticket/352 This also causes systemd journal to grow a lot with this messages and to consume a bit more to catch all of them I am not sure if you would know about how to solve this without needing to wait for upstream to fix it Thanks a lot
*** This bug has been marked as a duplicate of bug 1240711 ***