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[Martin Pitt <martin.pitt@xxxxxxxxxx>]

I also filed a (Debian) bug against LTSP yesterday, about improving this
"hiding" of the eth interface from NetworkManager directly. This avoids
having to rely on these subtleties of ifupdown.

** Bug watch added: Debian Bug tracker #810934
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=810934

** Also affects: ltsp (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=810934
   Importance: Unknown
       Status: Unknown

** Changed in: ltsp (Ubuntu)
       Status: Invalid => Triaged

** Changed in: ltsp (Ubuntu)
   Importance: Undecided => Low

** Summary changed:

- ifdown stops "manual" interfaces on shutdown
+ ifdown stops LTSP's "manual" interface on shutdown

-- 
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https://bugs.launchpad.net/bugs/1492546

Title:
  ifdown stops LTSP's "manual" interface on shutdown

Status in ifupdown package in Ubuntu:
  Fix Released
Status in ltsp package in Ubuntu:
  Triaged
Status in ifupdown package in Debian:
  Unknown
Status in ltsp package in Debian:
  Unknown

Bug description:
  The unit /lib/systemd/system/ifup@.service is Debian and Ubuntu specific, it's not part of upstream systemd.
  On shutdown, it unconditionally ifdowns all interfaces:
    ExecStop=/sbin/ifdown %I

  This is a regression from previous init systems (sysvinit and upstart)
  which cared so that when a network file system was in use, they didn't
  ifdown the interfaces.

  Specifically, both /etc/init.d/networking and /etc/init/networking contain these functions:
    check_network_file_systems()
    check_network_swaps()
  which output the message "not deconfiguring network interfaces: network file systems still mounted" and exit.

  So, please call the same functions in the ExecStop= part of
  ifup@.service.

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