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[Henry Gessau <gessau@xxxxxxxxx>]

** Also affects: python-neutronclient
   Importance: Undecided
       Status: New

** Also affects: horizon
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1362966

Title:
  IPv6 two attributes cannot be set to None

Status in OpenStack Dashboard (Horizon):
  New
Status in OpenStack Neutron (virtual network service):
  In Progress
Status in Python client library for Neutron:
  New

Bug description:
  The default value of IPv6 RA and address modes is None (if they are not specified when the subnet is created).
  However, we cannot change IPv6 two modes to None from other values after creating a subnet.
  (ra_mode address_mode) = (None, None) is a valid combinaiton, but for example we cannot change them from (slaac, slaac) to (none, none).

  IMO IPv6 two modes should accept None in API to allow users to reset
  the attribute value to None.

  ubuntu@dev02:~/neutron (master)$ neutron subnet-show 4ab34962-b330-4be5-98fe-ac7862f8d511
  +-------------------+---------------------------------------------------------------------------+
  | Field             | Value                                                                     |
  +-------------------+---------------------------------------------------------------------------+
  | allocation_pools  | {"start": "fe80:8888::2", "end": "fe80:8888:ff:ffff:ffff:ffff:ffff:fffe"} |
  | cidr              | fe80:8888::/40                                                            |
  | dns_nameservers   |                                                                           |
  | enable_dhcp       | True                                                                      |
  | gateway_ip        | fe80:8888::1                                                              |
  | host_routes       |                                                                           |
  | id                | 4ab34962-b330-4be5-98fe-ac7862f8d511                                      |
  | ip_version        | 6                                                                         |
  | ipv6_address_mode | slaac                                                                     |
  | ipv6_ra_mode      | slaac                                                                     |
  | name              |                                                                           |
  | network_id        | 07315dce-0c6c-4c2f-99ec-e8575ffa72af                                      |
  | tenant_id         | 36c29390faa8408cb9deff8762319740                                          |
  +-------------------+---------------------------------------------------------------------------+

  ubuntu@dev02:~/neutron (master)$ neutron subnet-update 4ab34962-b330-4be5-98fe-ac7862f8d511 --ipv6_ra_mode action=clear --ipv6_address_mode action=clear
  Invalid input for ipv6_ra_mode. Reason: 'None' is not in ['dhcpv6-stateful', 'dhcpv6-stateless', 'slaac']. (HTTP 400) (Request-ID: req-9431df59-3881-4c85-861e-b25217b8013d)

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