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[Chuck Short <chuck.short@xxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1358709

Title:
  SLAAC IPv6 addressing doesn't work with more than one subnet

Status in OpenStack Neutron (virtual network service):
  Fix Released
Status in neutron juno series:
  Fix Released

Bug description:
  When network has more than one IPv6 SLAAC (or dhcp-stateless) subnets,
  the port receives SLAAC address only from first one, the second
  address is from fixed IPs range.

  Scenario:
  1) create a network and two SLAAC subnets:
  ~$ neutron net-create net12
  ~$ neutron subnet-create net12 --ipv6-ra-mode=slaac --ipv6-address-mode=slaac --ip-version=6 2003::/64
  | allocation_pools  | {"start": "2003::2", "end": "2003::ffff:ffff:ffff:fffe"} |
  | cidr              | 2003::/64                                                |
  | dns_nameservers   |                                                          |
  | enable_dhcp       | True                                                     |
  | gateway_ip        | 2003::1                                                  |
  | host_routes       |                                                          |
  | id                | 220b7e4e-b30a-4d5c-847d-58df72bf7e8d                     |
  | ip_version        | 6                                                        |
  | ipv6_address_mode | slaac                                                    |
  | ipv6_ra_mode      | slaac                                                    |
  | name              |                                                          |
  | network_id        | 4cfe1699-a10d-4706-bedb-5680cb5cf27f                     |
  | tenant_id         | 834b2e7732cb4ad4b3df81fe0b0ea906                         |

  ~$ neutron subnet-create --name=additional net12 --ipv6-ra-mode=slaac --ipv6-address-mode=slaac --ip-version=6 2004::/64
  | allocation_pools  | {"start": "2004::2", "end": "2004::ffff:ffff:ffff:fffe"} |
  | cidr              | 2004::/64                                                |
  | dns_nameservers   |                                                          |
  | enable_dhcp       | True                                                     |
  | gateway_ip        | 2004::1                                                  |
  | host_routes       |                                                          |
  | id                | e48e5d96-565f-45b1-8efc-4634d3ed8bf8                     |
  | ip_version        | 6                                                        |
  | ipv6_address_mode | slaac                                                    |
  | ipv6_ra_mode      | slaac                                                    |
  | name              | additional                                               |
  | network_id        | 4cfe1699-a10d-4706-bedb-5680cb5cf27f                     |
  | tenant_id         | 834b2e7732cb4ad4b3df81fe0b0ea906                         |

  Now let's create port in this network:

  ~$ neutron port-create net12
  Created a new port:
  +-----------------------+--------------------------------------------------------------------------------------------------+
  | Field                 | Value                                                                                            |
  +-----------------------+--------------------------------------------------------------------------------------------------+
  | admin_state_up        | True                                                                                             |
  | allowed_address_pairs |                                                                                                  |
  | binding:vnic_type     | normal                                                                                           |
  | device_id             |                                                                                                  |
  | device_owner          |                                                                                                  |
  | fixed_ips             | {"subnet_id": "220b7e4e-b30a-4d5c-847d-58df72bf7e8d", "ip_address": "2003::f816:3eff:fe55:6297"} |
  |                       | {"subnet_id": "e48e5d96-565f-45b1-8efc-4634d3ed8bf8", "ip_address": "2004::2"}                   |
  | id                    | 12c29fd4-1c68-4aea-88c6-b89d73ebac2c                                                             |
  | mac_address           | fa:16:3e:55:62:97                                                                                |
  | name                  |                                                                                                  |
  | network_id            | 4cfe1699-a10d-4706-bedb-5680cb5cf27f                                                             |
  | security_groups       | 65e77cc0-879c-4ed0-b647-d27d36844e0b                                                             |
  | status                | DOWN                                                                                             |
  | tenant_id             | 834b2e7732cb4ad4b3df81fe0b0ea906                                                                 |

  As we see we get SLAAC IP from first subnet and fixed IP from second one.
  Expected is to get SLAAC IPs from both subnets.

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