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   Copyright (C) Internet Systems Consortium, Inc. ("ISC")
   
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Notes for BIND 9.17.9
---------------------

Security Fixes
~~~~~~~~~~~~~~

- None.

Known Issues
~~~~~~~~~~~~

- None.

New Features
~~~~~~~~~~~~

- ``ipv4only.arpa`` is now served when DNS64 is configured. [GL #385]

Removed Features
~~~~~~~~~~~~~~~~

- A number of non-working configuration options that had been marked
  as obsolete in previous releases have now been removed completely.
  Using any of the following options is now considered a configuration
  failure:
  ``acache-cleaning-interval``, ``acache-enable``, ``additional-from-auth``,
  ``additional-from-cache``, ``allow-v6-synthesis``, ``cleaning-interval``,
  ``dnssec-enable``, ``dnssec-lookaside``, ``filter-aaaa``,
  ``filter-aaaa-on-v4``, ``filter-aaaa-on-v6``, ``geoip-use-ecs``, ``lwres``,
  ``max-acache-size``, ``nosit-udp-size``, ``queryport-pool-ports``,
  ``queryport-pool-updateinterval``, ``request-sit``, ``sit-secret``,
  ``support-ixfr``, ``use-queryport-pool``, ``use-ixfr``. [GL #1086]

Feature Changes
~~~~~~~~~~~~~~~

- It is now possible to transition a zone from secure to insecure mode
  without making it bogus in the process; changing to ``dnssec-policy
  none;`` also causes CDS and CDNSKEY DELETE records to be published, to
  signal that the entire DS RRset at the parent must be removed, as
  described in RFC 8078. [GL #1750]

- The default value of ``max-stale-ttl`` has been changed from 12 hours to 1
  day and the default value of ``stale-answer-ttl`` has been changed from 1
  second to 30 seconds, following RFC 8767 recommendations. [GL #2248]

- When using the ``unixtime`` or ``date`` method to update the SOA
  serial number, ``named`` and ``dnssec-signzone`` silently fell back to
  the ``increment`` method to prevent the new serial number from being
  smaller than the old serial number (using serial number arithmetics).
  ``dnssec-signzone`` now prints a warning message, and ``named`` logs a
  warning, when such a fallback happens. [GL #2058]

Bug Fixes
~~~~~~~~~

- Multiple threads could attempt to destroy a single RBTDB instance at
  the same time, resulting in an unpredictable but low-probability
  assertion failure in ``free_rbtdb()``. This has been fixed. [GL #2317]

- ``named`` no longer attempts to assign threads to CPUs outside the CPU
  affinity set. Thanks to Ole Bjørn Hessen. [GL #2245]

- When reconfiguring ``named``, removing ``auto-dnssec`` did not turn
  off DNSSEC maintenance. This has been fixed. [GL #2341]

- KASP incorrectly set signature validity to the value of the DNSKEY signature
  validity. This is now fixed. [GL #2383]