Prevent Debian/Ubuntu from using MDNS

no_multicast_noise.sh

#!/bin/bash
# This script assumes a regular user with sudo access
SUDO=sudo
# If this runs as root, use 'SUDO=' and comment the entry above
# SUDO=
for package in avahi-daemon avahi-autoipd libavahi-core7 libavahi-gobject0; do
  sudo apt-get purge $package # Get rid of it
  sudo apt-mark $package # Mark it so it never comes back again
done