Dear Maintainer, I notice that the file: /etc/systemd/system/network-online.target.wants/networking.service contains the lines: ExecStart=/sbin/ifup -a --read-environment ExecStop=/sbin/ifdown -a --read-environment --exclude=lo I cannot find a description of the --read-environment option in the man page or by using --help. Many thanks for your work on this package. Regards