My logs are full of the following error message:
Apr 10 16:11:14 localhost network-up[7653]: fgrep: ifcfg-ifcfg-Auto_orange1: Aucun fichier ou dossier de ce type

Actually, the complex sed expression in line 36 of network-up service is confused with filenames with space inside, such as 'ifcfg-Auto_orange 1', resulting in the ifcfg prefix not being stripped. Adding a space to the character class in regexp from line 39 is enough to fix the issue:
 -e '/ifcfg-[A-Za-z0-9\._-]\+$/ { s/^ifcfg-//g;s/[0-9]/ &/}' | \ ->
 -e '/ifcfg-[ A-Za-z0-9\._-]\+$/ { s/^ifcfg-//g;s/[0-9]/ &/}' | \