For the time being, my main concern is to keep my connection up! I did
succeed, without succeeding for long. Each time I rebooted I had no access to
interness. Three
times (or more) I couldn't have a full access including on my home wifi
access point. I even reinstalled Stretch two times, before suspecting something
else than my
dnmasq, NetworkManager etc...
It was difficult to find the guilty program, until I thought about
Ivahi-daemon which didn't appear in the logs. Shouldn't I suppress the Avahis
pachages? As
soon as I know, I come back to my main concern, i.e. DNS,SOA... Anyway Thanks
you both Reco and Curt