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[Kevin Benton <1407573@xxxxxxxxxxxxxxxxxx>]

dnsmasq also provides DNS lookups. This optimization doesn't seem worth
it.

** Changed in: neutron
       Status: In Progress => Won't Fix

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https://bugs.launchpad.net/bugs/1407573

Title:
  DHCP agent should not create DHCP port and spawn dnsmasq when subnet
  is IPv6 and ipv6-address-mode is None or SLAAC

Status in neutron:
  Won't Fix

Bug description:
  According to the design of IPv6 subnet ra mode and address mode, when
  ipv6 address mode is None or SLAAC, VM either obtain address from
  OpenStack/external RADVD or obtain address from external dhcp server.
  It's not necessary to create DHCP port or spawn dnsmasq process for
  such ipv6 subnets. Right now, the DHCP port is created and dnsmasq
  process is spawned (but not used).

  ra mode and address mode design:

  https://github.com/openstack/neutron-specs/blob/master/specs/juno/ipv6
  -radvd-ra.rst

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