This bug relates to https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=764084
I like the simple solution proposed in message #26 ( https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=533233#26) where the metric for RFC3927 subnet is raised above the wireless connexions' default metric (1024). However, a definitive solution would be that avahi-autoipd doesn't assign a RFC3927 address when no cable is connected to the ethernet interface. Maybe the ifupdown-extra could help here? See also bug 764084 for more on this RFC3927 problem. Cyrille