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[Nilesh <2121346@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Step to reproduce issue.
Create network(virtual-net) with dns_zone(lon.testing.com.)

A subnet (virtual-net-subnet) with DNS Publish Fixed IP diabled.

Create another subnet(subnet-dns-publish-fixed-ip) with with DNS Publish
Fixed IP enabled.

Create a port with subnet virtual-net-subnet.

dns record created in the server for port even flag dns_publish_fixed_ip
is disable for subnet.

When checked in code I found below code which cause issue . which check
if any subnet in network is enable the "dns_publish_fixed_ip" flag then
created record.

in file neutron/plugins/ml2/extensions/dns_integration.py

 def external_dns_not_needed(self, context, network, subnets):
        dns_driver = _get_dns_driver()
        if not dns_driver:
            return True
        for subnet in subnets:
            if subnet.get('dns_publish_fixed_ip'):
                return False
        if network['router:external']:
            return True

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2121346

Title:
  DNS record is created for port even dns-publish-fixed-ip is not enable
  on subnet

Status in neutron:
  New

Bug description:
  Step to reproduce issue.
  Create network(virtual-net) with dns_zone(lon.testing.com.)

  A subnet (virtual-net-subnet) with DNS Publish Fixed IP diabled.

  Create another subnet(subnet-dns-publish-fixed-ip) with with DNS
  Publish Fixed IP enabled.

  Create a port with subnet virtual-net-subnet.

  dns record created in the server for port even flag
  dns_publish_fixed_ip is disable for subnet.

  When checked in code I found below code which cause issue . which
  check if any subnet in network is enable the "dns_publish_fixed_ip"
  flag then created record.

  in file neutron/plugins/ml2/extensions/dns_integration.py

   def external_dns_not_needed(self, context, network, subnets):
          dns_driver = _get_dns_driver()
          if not dns_driver:
              return True
          for subnet in subnets:
              if subnet.get('dns_publish_fixed_ip'):
                  return False
          if network['router:external']:
              return True

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