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[Neil Jerram <neil@xxxxxxxxx>]

If I understand correctly, this is not an independent bug.  Rather, it
only arises when changes are made in networking-calico to address
another bug (1541490).  And the only proposed change for _this_ bug is
now also in networking-calico.

Therefore it doesn't make sense for this bug to have an independent
existence from 1541490, or for any changes for this bug to be separated
from proposed changes from 1541490.  I will close this bug for
networking-calico, and ask that you simply combine all of the
networking-calico changes that you think are needed for 1541490.

** Changed in: networking-calico
       Status: In Progress => Invalid

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https://bugs.launchpad.net/bugs/1625209

Title:
  ipv6 options are being checked for ipv4 subnet

Status in networking-calico:
  Invalid
Status in neutron:
  Invalid

Bug description:
  When DHCP agent tries to set fixed_ips parameter for DHCP port (see https://bugs.launchpad.net/networking-calico/+bug/1541490) Neutron checks ipv6_address_mode and ipv6_ra_mode options of subnet that corresponds to the given fixed IP even for IPv4 subnet. And this fails as IPv4 subnet does not have such options (see traceback http://paste.openstack.org/show/580996/). And, of course, you cannot set such flags for IPv4 subnet.
  I'd expect that such check is performed for IPv6 subnets only.

  Probably, this situation is possible not only while using non-native
  DHCP agent.

  Neutron version: Newton (7f6b5b5d8953159740f74b0a4a5280527f6baa69).
  Environment: Calico (https://github.com/openstack/networking-calico) over Neutron.
  Point of failure: https://github.com/openstack/neutron/blob/7f6b5b5d8953159740f74b0a4a5280527f6baa69/neutron/agent/linux/dhcp.py#L1342
  Traceback: http://paste.openstack.org/show/580996/
  Failure rate: always.

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