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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+=====================================
+Allow ip6 server search for non-admin
+=====================================
+
+https://blueprints.launchpad.net/nova/+spec/allow-ip6-search-for-non-admin
+
+Add ``ip6`` to the list of options that are allowed for non-admins when
+listing servers.
+
+
+Problem description
+===================
+
+Filtering by IPv6 address is currently only allowed for admins, but there
+is no reason to treat this differently than IPv4. It is also quite surprising
+for a user to find that ``nova list --ip6 xxx`` will list all servers.
+
+Use Cases
+---------
+
+A user will want to list servers based on their IPv6 address, just like they
+can already do based on IPv4.
+
+Project Priority
+----------------
+
+None
+
+Proposed change
+===============
+
+Add a new API microversion for which the ``ip6`` option will no longer be
+filtered out from the server search for non-admins.
+
+Alternatives
+------------
+
+Treat the bug fix as a minor patch that will not require a new API
+microversion. However in the conversation about the fix (see References)
+there seemed to be consensus that a microversion is needed in order for
+a client to be able to tell whether filtering by IPv6 is available or not.
+
+Data model impact
+-----------------
+
+None
+
+REST API impact
+---------------
+
+The new API is added as a microversion.
+
+Request::
+
+    GET /servers?ip6=<regex>
+
+The request and response headers, body and possible codes are unchanged from
+current behaviour. The ``ip6`` option will no longer be silently discarded
+for non-admins.
+
+Security impact
+---------------
+
+None
+
+Notifications impact
+--------------------
+
+None
+
+Other end user impact
+---------------------
+
+python-novaclient will have to be updated so that it can request the new
+microversion when the ``--ip6`` option is used.
+
+Performance Impact
+------------------
+
+None
+
+Other deployer impact
+---------------------
+
+None
+
+Developer impact
+----------------
+
+None
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  Jens Rosenboom <j.rosenboom@x-ion.de>
+
+Work Items
+----------
+
+* Add a new microversion and change
+  ``nova/api/openstack/compute/plugins/v3/servers.py`` to add ``ip6`` to the
+  list of allowed server search options.
+
+Dependencies
+============
+
+None
+
+
+Testing
+=======
+
+* Unit tests and API samples functional tests in the nova tree will be added.
+
+
+Documentation Impact
+====================
+
+The nova/api/openstack/rest_api_version_history.rst document will be updated.
+
+
+References
+==========
+
+[1] Originally reported as a bug: https://bugs.launchpad.net/nova/+bug/1450859
+
+[2] ML thread discussing whether a microversion is needed:
+  http://lists.openstack.org/pipermail/openstack-dev/2015-May/065118.html
+
+[3] Proof of concept code change: https://review.openstack.org/179569