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[Cedric Schieli <cschieli@xxxxxxxxx>]

+1

I've been running the backported fix (just dropped the patch) without a glitch for several month.
If that helps, I've just created a PPA for this backport (currently rebuilding): https://launchpad.net/~cschieli/+archive/ubuntu/bug1273201

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https://bugs.launchpad.net/bugs/1273201

Title:
  bridge_ignore_without_connections.patch breaks NM created bridge at
  boot

Status in network-manager package in Ubuntu:
  Fix Released

Bug description:
  I've created a bridge with network-manager-gnome, the bridge slave
  physical device is eth0. After a reboot the bridge is brought up, but
  eth0 isn't attached.

  First test-case:
  Created a bridge with network-manager-gnome with the bridge slave physical device is eth0 and remove all other connections. After a reboot the bridge is brought up, but eth0 isn't attached. When I open /etc/NetworkManager/NetworkManager.conf and save it without any modification, eth0 is instantly added to my bridge. Strange!

  Second test-case:
  Created a bridge with network-manager-gnome with the bridge slave physical device is eth0. Disable the "autoconnect" of the default wired network. After a reboot the bridge is brought up, but eth0 isn't  attached. Instead eth0 is brought up and full configured.

  After compiling and testing different upstream versions, i could track
  the problem down to bridge_ignore_without_connections.patch.  A
  network-manager package without this specific patch, brings my bridge
  up at boot and adds eth0 to the bridge in both test-cases.

  I've checked the behaviour on my ubuntu 13.10 box with network-manager
  (0.9.8.0-0ubuntu22)  and the trusty version network-manager
  (0.9.8.8-0ubuntu1) .

  Till now i couldn't  encounter any sideeffects of removing this patch
  with the bridge created by libvirt.

  Regards
  Mathias Kresin

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