Autre solution, utiliser le dispatcher de NM : tu mets un script XX-quelquechose en root:root 600 dans /etc/NetworkManager/dispatcher.d contenant :
interface="$1"
action="$2"
case "${action}" in
up)
;;
down)
if [ "${interface}" = "wlan0" ] ; then
echo "nameserver 208.67.220.220" >> /etc/resolv.conf
echo "nameserver 208.67.222.222" >> /etc/resolv.conf
fi
;;
*)
echo "Action ${action} unknown"
;;
esac
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