I just switched from Kubuntu to Debian Stretch with KDE and have a problem stopping my openVPN connections.
They are started automatically at system boot, but sometimes I have to stop one of them manually.
In old Debian I used ifup and ifdown for that task
In Kubuntu I used ifconfig
In Debian Strech I'm clueless, even after some recherche.
I have ifup and ifdown installed but it doesn't find my adapters.
My adapters are:
enp3sC for the ethernet device
tun1 and tun3 for openVPN devices
ifdown tun1 (or any other network device) just results in
ifdown: unknown inerface tun1
How is it done nowadays?