Comment 0 for bug 1321663

avahi-daemon.conf has an entry disallow-other-stacks. According to the docs, if this is set to "no", other stacks should be able to bind UDP port 5353. However this doesn't work, regardless of this setting, avahi grabs the port in exclusive mode and doesn't let other applications snoop nDNS traffic any more. This breaks some application's auto discovery for network devices.