[systemd-bugs] [Bug 83134] New: networkd: .network file without a [Match] section probably shouldn't match loopback interface

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83134

          Priority: medium
            Bug ID: 83134
          Assignee: systemd-bugs at lists.freedesktop.org
           Summary: networkd: .network file without a [Match] section
                    probably shouldn't match loopback interface
        QA Contact: systemd-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: mus.svz at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: general
           Product: systemd

I'm running systemd 216 and have the following network file in order to get
DHCP on my ethernet and my wireless interface (it's a laptop and I'm using
wpa_supplicant for the wireless interface):

[Network]
DHCP=v4

Using the new networkctl tool I noticed that the loopback interface was in
SETUP "configuring" and networkd is indeed sending DHCP requests on the
loopback interface.

I know that this is technically correct since the loopback interface matches
because of the missing [Match] section. But imho this is kind of unexpected
behaviour, especially since I can't think of a reason why one might want to
configure the loopback interface.

Feel free to close this if you don't consider it a bug, but maybe there should
at least be a warning in the man page that a missing [Match] section also
matches lo.

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