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[Alan Pevec <1501451@xxxxxxxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1501451

Title:
  Inconsistency in dhcp-agent when filling hosts and opts files

Status in neutron:
  Fix Committed
Status in neutron juno series:
  Fix Released

Bug description:
  We have bunch of subnets created in pre-Icehouse era, that have
  ipv6_address_mode and ipv6_ra_mode unset.  For dhcpv6 functionality we
  rely on enable_dhcp setting for a subnet.  However, in _iter_hosts
  port is skipped iff ipv6_address_mode set to SLAAC, but in
  _generate_opts_per_subnet subnet is skipped when ipv6_address_mode id
  SLAAC or unset.

  Since we can not update ipv6_address_mode attribute in existing
  subnets (allow_put is False), this breaks DHCPv6 for these VMs.

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