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[Bug 1229625] Re: hairpin mode on vnet bridge ports causes false positives on IPv6 duplicate address detection

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>
Date: Wed, 04 Dec 2013 10:33:40 -0000
Reply-to: Bug 1229625 <1229625@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

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

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https://bugs.launchpad.net/bugs/1229625

Title:
   hairpin mode on vnet bridge ports causes false positives on IPv6
  duplicate address detection

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  This is bug 1011134 again happening in a cloud that does not have the ipv6 flag set,
  so the previous patch from https://review.openstack.org/14017
  is not used.
  Guest VMs will try to configure IPv6 link-local addrs even without the outer parts supporting it
  and can throw errors when they see inbound packets with their own MAC address.

  Note: I think, this bug can not be unit-tested as it requires a
  complex setup including running a VM in a cloud.

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