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[Doug Hellmann <doug@xxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1507078

Title:
  arping for floating IPs fail on newer kernels

Status in neutron:
  Fix Released

Bug description:
  The code to send gratuitous ARPs changed in Liberty to be simpler
  because we started setting the sysctl net.ipv4.ip_nonlocal_bind to 1
  in the root namespace.  It seems like in newer kernels (3.19 or so)
  that this sysctl attribute was added to the namespaces, so now that
  arping call fails because we are only enabling non-local binds in the
  root namespace.

  This is an example when run by hand:

  $ sudo ip netns exec fip-311e3d4a-00ec-46cc-9928-dbc1a2fe3f9a arping -A -I fg-bb6b6721-78 -c 3 -w 4.5 172.18.128.7
  bind: Cannot assign requested address

  Failing to get that ARP out can affect connectivity to the floating
  IP.

  In order to support either kernel, the code should change to try
  setting it in the namespace, and if it fails, then set it in the root
  namespace.

  This is backport potential to stable/liberty.

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