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[Dimitri John Ledkov <launchpad@xxxxxxxxxxxx>]

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

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

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

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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:
  Invalid
Status in systemd source package in Xenial:
  In Progress
Status in systemd source package in Zesty:
  Invalid
Status in systemd source package in Artful:
  Invalid
Status in systemd source package in Bionic:
  Invalid

Bug description:
  [Impact]

   * Setting [Link] MTUBytes= in .network file has a side-effect of
  overflowing and setting NOARP flag. This is not intended behaviour /
  regression.

   * Trying to fix above by setting ARP=on fails to work as tristate is
  incorrectly acted upon by unconditionally adding NOARP flag

   * This is a regression in -updates.

  [Test Case]

   * Configure an ethernet device with a .network file alone
   * e.g. Match by mac address and perform DHCP
   * Add [Link] section to the .network file which changes MTUBytes
   * Device brought up using this configuration should not have NOAPR flag in the output of iproute link output

  
   * Further add ARP=off to that .network file, the link should have NOARP flag
   * Further add ARP=on to that .network file, the link should not have NOARP flag

  [Regression Potential]

   * These are upstream fixes for ARP= key that are part of zesty and up

  [Other Info]

   * Upstream fixes
  https://github.com/systemd/systemd/commit/b8b40317d0355bc70bb23a6240a36f3630c4952b.patch
  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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