systemsettings and tdenetworkmanager switching between wired and wireless problem with DNS server

Hi - I used /opt/trinity/bin/systemsettings for setting the wired net - and tdenetworkmanager for the wireless net. Maybe this is not smart and I had no problems, when passing from wired --> wireless but problems when passing from wireless --> wired since the wireless deleted the DNS server entries in the resolv.conf So usually I manually copied a backup of resolv.conf to /etc and run sudo /etc/init.d/networking restart But this does not work anymore in 14.04 as we discussed. So what is the smart way of configuring wired/wireless and what is the smart way of switching between wired/wireless???? Relying entirely on systemsettings or on tdenetworkmanager? Uwe Brauer