@hmerk : Thank you very much for your quick reply. However, what is strange, is that my old āprocedureā only does not work since 4.3. Was the āoldā possibility switched off with 4.3?
No, this is not related to openHAB, this is OS depending. Therefore my advice to check the docs of your OS.
Please keep in mind, if you are using an openHABian installation, setting static IP is not supported!
@hmerk: thank you very much for that. Maybe that is the reason, why I always had problems updating OH to the next release via Openhabian.
Anyway, I changed the settings now to the proposed set-up (i.e. allocating fixed IP adress via router)