Yes, that´s the whole content of the file. That´s a good point, there is no sign of Network Manager being the responsible of the rewritten file...
These are the files I have under /etc/network/if-up.d: avahi-autoipd ethtool openssh-server upstart avahi-daemon mountnfs openvpn wpasupplicant The avahi-daemon file looks like it is actually calling /usr/lib/avahi/avahi- daemon-check-dns.sh which might be responsible for that. I will investigate further. Thank you! Enrique El Domingo, 17 de enero de 2016 00:27:11 Michael Biebl escribió: > Am 17.01.2016 um 00:17 schrieb Enrique Garcia: > > This is just fine, but only 10 seconds after that the file now looks like: > > $ cat /etc/resolv.conf > > nameserver 2001:4c50:6:4000::12 > > nameserver 2001:4c50:6:4000::16 > > Is this the complete content of the file? NetworkManager should always > write a "# Generated by NetworkManager" header. > > So this looks like "something else" did overwrite /etc/resolv.conf. > Do you have any if-up.d hooks which might be causing that?