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[Dave Walker <email@xxxxxxxxxx>]

** Also affects: neutron/kilo
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1469322

Title:
  Associating a floatingip with a dual stack port requires the fixed-
  address to be specified

Status in neutron:
  Fix Released
Status in neutron kilo series:
  New

Bug description:
  Associating a floatingip with a dual stack port fails unless the IPv4
  address is specified with the fixed-ip-address parameter. Presently
  when a user attempts to associate a floatingip with a port which an
  IPv4 and IPv6 address Neutron returns 'Bad floatingip request: Port %s
  has multiple fixed IPs.  Must provide a specific IP when assigning a
  floating IP'.

  While this is a helpful error message, it would be better if Neutron
  could infer that the floating IP must be associated with the fixed-ip
  of the same address family.

  See also https://bugs.launchpad.net/neutron/+bug/1323766, restricting
  floating IPs to IPv4 would simply things since associating an dual
  stack floating IP with a dual stack port could result in any of the
  following:

  1. 1:1 NAT between the IPv4 address of the floating IP and IPv4 address of 
  the associated port.
  2. 1:1 NAT between the IPv6 address of the floating IP and IPv6 address of the associated port.
  3. Both 1 and 2 (Neutron presently only uses the first fixed-ip of the port owned by the floating IP)
  4. a NAT-PT between the IPv4 address of the floating IP and IPv6 address of 
  the associated port
  5. a NAT-PT between the IPv6 address of the floating IP and IPv4 address of 
  the associated port

  Since NAT-PT and IPv6 NAT are not widely supported option 1 would be
  preferable and the most intuitive of these results.

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