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[Dimitri John Ledkov <launchpad@xxxxxxxxxxxx>]

** Changed in: systemd (Ubuntu Zesty)
       Status: Fix Released => Confirmed

** Changed in: systemd (Ubuntu Bionic)
       Status: Fix Released => Confirmed

** Changed in: systemd (Ubuntu Zesty)
   Importance: Undecided => Critical

** Changed in: systemd (Ubuntu Artful)
       Status: Fix Released => Confirmed

** Changed in: systemd (Ubuntu Artful)
   Importance: Undecided => Critical

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https://bugs.launchpad.net/bugs/1727301

Title:
  229-4ubuntu20 added ARP option breaks existing bonding interfaces

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Confirmed
Status in systemd source package in Xenial:
  In Progress
Status in systemd source package in Zesty:
  Confirmed
Status in systemd source package in Artful:
  Confirmed
Status in systemd source package in Bionic:
  Confirmed

Bug description:
  [Impact]

   * Incomplete cherrypick of ARP functionality in networkd resulted in
  an undesired side-effect, specifically NOARP flag started to be
  applied unconditionally, specifically when it should not have,
  resulting in loss of network connectivity.

  * This is a regression in -updates.

  [Test Case]

   * Configure a bond using networkd
   * Upgrade
   * Make sure NOARP flag is not set on the interfaces / bond

  [Regression Potential]

   * This is an upstream fix for this issue.

  [Other Info]
   
   * Upstream fix
  https://github.com/systemd/systemd/commit/1ed1f50f8277df07918e13cba3331a114eaa6fe3.patch
   
   * Original bug report

  this breaks existing configurations with bonding on upgrading from
  229-4ubuntu19 to 229-4ubuntu20 on xenial

  as bond interfaces are now by default configured without ARP. Hence
  you suddenly lose network connectivity on upgrade. Very bad for a SRU.

  Plus adding "ARP=yes" to the Link section of a .network file does not
  work.

  Before this update, bond interfaces (specifically 802.3ad) were
  defaulting to ARP enabled. After the upgrade, they are created with
  NOARP set on the link.

  pre-upgrade:

  eth0: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP>
  eth1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP>
  bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP>

  post-upgrade:
  eth0: <BROADCAST,MULTICAST,NOARP,SLAVE,UP,LOWER_UP>
  eth1: <BROADCAST,MULTICAST,NOARP,SLAVE,UP,LOWER_UP>
  bond0: <BROADCAST,MULTICAST,NOARP,MASTER,UP,LOWER_UP>

  Linux cnode11 4.4.0-97-generic #120-Ubuntu SMP Tue Sep 19 17:28:18 UTC
  2017 x86_64 x86_64 x86_64 GNU/Linux

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