Editing /var/lib/openhab2/config/org/eclipse/smarthome/network.config and setting subnet and broadcast address eliminated the WARNINGS.
https://community.openhab.org/t/parameter-setting-org-eclipse-smarthome-network/36545
Still having problem s in PaperUI:
Add-ON menue not visible and all Configuration Sub Menue not accessable getting an 503:service not available error message