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handle IPv6 race condition due to hairpin mode
bug 1011134 When using IPv6 an instance sees its own neighbour advertisement, because of the reflective property of the hairpin mode. Because of this the trigger-happy duplicate address detection in the instance's kernel deconfigures the IPv6 address on the interface, resulting in no IPv6 connectivity. Approach of this commit is to to add an nwfilter to libvirt which identifies this particular scenario and filters it. Change-Id: I28f9b49cee4b2ab6ff591fae4feee623955f845f
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