---
prelude: >
    DNS server assignment can now be disabled in replies sent from the DHCP agent.
features:
  - |
    It is now possible to instruct the DHCP agent not to supply any DNS server
    address to their clients by setting the ``dns_nameservers`` attribute for
    the corresponding subnet to ``0.0.0.0`` or ``::``, for IPv4 or IPv6 subnets
    (respectively).
upgrade:
  - |
    The functionality when a subnet has its DNS server set to ``0.0.0.0`` or
    ``::`` has been changed with this release. The old behaviour was that each
    DHCP agent would supply only its own IP address as the DNS server to its
    clients. The new behaviour is that the DHCP agent will not supply any DNS
    server IP address at all.