Better error handling when setup interface.
Better error handling when setup interface.

Drooids/babeld,boutier/babeld,wlanslovenija/babeld,Gwendocg/babeldToS,Gwendocg/babeldToS,wlanslovenija/babeld,dtaht/babeld-shortrtt-metrics,sudomesh/babeld,woniullb/babeld,jech/babeld,tcatm/babeld,jech/babeld