doc/arm/notes.html

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ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<!--
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson -
d4ef65050feac78554addf6e16a06c6e2e0bd331Brian Wellington - Permission to use, copy, modify, and/or distribute this software for any
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - purpose with or without fee is hereby granted, provided that the above
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - copyright notice and this permission notice appear in all copies.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson -
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - PERFORMANCE OF THIS SOFTWARE.
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ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="article"><div class="section">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<div class="titlepage"></div>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<span style="color: red">&lt;title&gt;Release Notes for BIND Version 9.11.0pre-alpha&lt;/title&gt;</span><div class="section">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<div class="titlepage"><div><div><h3 class="title">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<a name="relnotes_intro"></a>Introduction</h3></div></div></div>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      This document summarizes changes since the last production release
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      of BIND on the corresponding major release branch.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson</div>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<div class="section">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<div class="titlepage"><div><div><h3 class="title">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<a name="relnotes_download"></a>Download</h3></div></div></div>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      The latest versions of BIND 9 software can always be found at
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      <a class="link" href="http://www.isc.org/downloads/" target="_top">http://www.isc.org/downloads/</a>.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      There you will find additional information about each release,
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      source code, and pre-compiled versions for Microsoft Windows
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      operating systems.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson</div>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<div class="section">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<div class="titlepage"><div><div><h3 class="title">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<a name="relnotes_security"></a>Security Fixes</h3></div></div></div>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem"><p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      Insufficient testing when parsing a message allowed
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      records with an incorrect class to be be accepted,
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      triggering a REQUIRE failure when those records
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      were subsequently cached.  This flaw is disclosed
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      in CVE-2015-8000. [RT #4098]
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p></li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem"><p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      An incorrect boundary check in the OPENPGPKEY rdatatype
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      could trigger an assertion failure. This flaw is disclosed
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      in CVE-2015-5986. [RT #40286]
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p></li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      A buffer accounting error could trigger an assertion failure
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      when parsing certain malformed DNSSEC keys.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      This flaw was discovered by Hanno B�ck of the Fuzzing
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      Project, and is disclosed in CVE-2015-5722. [RT #40212]
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson</li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      A specially crafted query could trigger an assertion failure
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      in message.c.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      This flaw was discovered by Jonathan Foote, and is disclosed
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      in CVE-2015-5477. [RT #40046]
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson</li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      On servers configured to perform DNSSEC validation, an
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      assertion failure could be triggered on answers from
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      a specially configured server.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      This flaw was discovered by Breno Silveira Soares, and is
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      disclosed in CVE-2015-4620. [RT #39795]
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson</li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      On servers configured to perform DNSSEC validation using
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      managed trust anchors (i.e., keys configured explicitly
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      via <span class="command"><strong>managed-keys</strong></span>, or implicitly
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      via <span class="command"><strong>dnssec-validation auto;</strong></span> or
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      <span class="command"><strong>dnssec-lookaside auto;</strong></span>), revoking
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      a trust anchor and sending a new untrusted replacement
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      could cause <span class="command"><strong>named</strong></span> to crash with an
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      assertion failure. This could occur in the event of a
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      botched key rollover, or potentially as a result of a
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      deliberate attack if the attacker was in position to
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      monitor the victim's DNS traffic.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      This flaw was discovered by Jan-Piet Mens, and is
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      disclosed in CVE-2015-1349. [RT #38344]
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson</li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      A flaw in delegation handling could be exploited to put
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      <span class="command"><strong>named</strong></span> into an infinite loop, in which
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      each lookup of a name server triggered additional lookups
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      of more name servers.  This has been addressed by placing
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      limits on the number of levels of recursion
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      <span class="command"><strong>named</strong></span> will allow (default 7), and
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      on the number of queries that it will send before
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      terminating a recursive query (default 50).
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      The recursion depth limit is configured via the
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      <code class="option">max-recursion-depth</code> option, and the query limit
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      via the <code class="option">max-recursion-queries</code> option.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      The flaw was discovered by Florian Maury of ANSSI, and is
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      disclosed in CVE-2014-8500. [RT #37580]
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson</li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      Two separate problems were identified in BIND's GeoIP code that
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      could lead to an assertion failure. One was triggered by use of
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      both IPv4 and IPv6 address families, the other by referencing
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      a GeoIP database in <code class="filename">named.conf</code> which was
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson      not installed. Both are covered by CVE-2014-8680. [RT #37672]
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson      [RT #37679]
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson    </p>
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson<p>
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson      A less serious security flaw was also found in GeoIP: changes
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson      to the <span class="command"><strong>geoip-directory</strong></span> option in
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson      <code class="filename">named.conf</code> were ignored when running
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson      <span class="command"><strong>rndc reconfig</strong></span>. In theory, this could allow
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson      <span class="command"><strong>named</strong></span> to allow access to unintended clients.
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson</li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson</ul></div>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson</div>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<div class="section">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<div class="titlepage"><div><div><h3 class="title">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<a name="relnotes_features"></a>New Features</h3></div></div></div>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      Added support for DynDB, a new interface for loading zone data
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      from an external database, developed by Red Hat for the FreeIPA
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      project.  (Thanks in particular to Adam Tkac and Petr
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      Spacek of Red Hat for the contribution.)
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      Unlike the existing DLZ and SDB interfaces, which provide a
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      limited subset of database functionality within BIND &#8212;
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      translating DNS queries into real-time database lookups with
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      relatively poor performance and with no ability to handle
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      DNSSEC-signed data &#8212; DynDB is able to fully implement
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      and extend the database API used natively by BIND.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      A DynDB module could pre-load data from an external data
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      source, then serve it with the same performance and
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      functionality as conventional BIND zones, and with the
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      ability to take advantage of database features not
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      available in BIND, such as multi-master replication.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson</li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      New quotas have been added to limit the queries that are
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      sent by recursive resolvers to authoritative servers
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      experiencing denial-of-service attacks. When configured,
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      these options can both reduce the harm done to authoritative
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      servers and also avoid the resource exhaustion that can be
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      experienced by recursives when they are being used as a
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      vehicle for such an attack.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem"><p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson          <code class="option">fetches-per-server</code> limits the number of
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson          simultaneous queries that can be sent to any single
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson          authoritative server.  The configured value is a starting
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson          point; it is automatically adjusted downward if the server is
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson          partially or completely non-responsive. The algorithm used to
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson          adjust the quota can be configured via the
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson          <code class="option">fetch-quota-params</code> option.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson        </p></li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem"><p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson          <code class="option">fetches-per-zone</code> limits the number of
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson          simultaneous queries that can be sent for names within a
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson          single domain.  (Note: Unlike "fetches-per-server", this
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson          value is not self-tuning.)
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson        </p></li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson</ul></div>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      Statistics counters have also been added to track the number
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      of queries affected by these quotas.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson</li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem">
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      Added support for <span class="command"><strong>dnstap</strong></span>, a fast,
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      flexible method for capturing and logging DNS traffic,
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      developed by Robert Edmonds at Farsight Security, Inc.,
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      whose assistance is gratefully acknowledged.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      To enable <span class="command"><strong>dnstap</strong></span> at compile time,
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      the <span class="command"><strong>fstrm</strong></span> and <span class="command"><strong>protobuf-c</strong></span>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      libraries must be available, and BIND must be configured with
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      <code class="option">--enable-dnstap</code>.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      A new utility <span class="command"><strong>dnstap-read</strong></span> has been added
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      to allow <span class="command"><strong>dnstap</strong></span> data to be presented in
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      a human-readable format.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      For more information on <span class="command"><strong>dnstap</strong></span>, see
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      <a class="link" href="http://dnstap.info" target="_top">http://dnstap.info</a>.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson</li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem"><p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      New statistics counters have been added to track traffic
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      sizes, as specified in RSSAC002.  Query and response
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      message sizes are broken up into ranges of histogram buckets:
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      TCP and UDP queries of size 0-15, 16-31, ..., 272-288, and 288+,
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      and TCP and UDP responses of size 0-15, 16-31, ..., 4080-4095,
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      and 4096+.  These values can be accessed via the XML and JSON
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      statistics channels at, for example,
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      <a class="link" href="http://localhost:8888/xml/v3/traffic" target="_top">http://localhost:8888/xml/v3/traffic</a>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      or
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      <a class="link" href="http://localhost:8888/json/v1/traffic" target="_top">http://localhost:8888/json/v1/traffic</a>.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p></li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem"><p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      The serial number of a dynamically updatable zone can
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      now be set using
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      <span class="command"><strong>rndc signing -serial <em class="replaceable"><code>number</code></em> <em class="replaceable"><code>zonename</code></em></strong></span>.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      This is particularly useful with <code class="option">inline-signing</code>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      zones that have been reset.  Setting the serial number to a value
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      larger than that on the slaves will trigger an AXFR-style
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      transfer.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p></li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem"><p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      When answering recursive queries, SERVFAIL responses can now be
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      cached by the server for a limited time; subsequent queries for
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      the same query name and type will return another SERVFAIL until
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      the cache times out.  This reduces the frequency of retries
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      when a query is persistently failing, which can be a burden
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      on recursive serviers.  The SERVFAIL cache timeout is controlled
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      by <code class="option">servfail-ttl</code>, which defaults to 1 second
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      and has an upper limit of 30.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p></li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem"><p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      The new <span class="command"><strong>rndc nta</strong></span> command can now be used to
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      set a "negative trust anchor" (NTA), disabling DNSSEC validation for
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      a specific domain; this can be used when responses from a domain
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      are known to be failing validation due to administrative error
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      rather than because of a spoofing attack. NTAs are strictly
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      temporary; by default they expire after one hour, but can be
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      configured to last up to one week.  The default NTA lifetime
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      can be changed by setting the <code class="option">nta-lifetime</code> in
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      <code class="filename">named.conf</code>. When added, NTAs are stored in a
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      file (<code class="filename"><em class="replaceable"><code>viewname</code></em>.nta</code>)
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      in order to persist across restarts of the <span class="command"><strong>named</strong></span> server.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson    </p></li>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson<li class="listitem"><p>
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson      The EDNS Client Subnet (ECS) option is now supported for
      authoritative servers; if a query contains an ECS option then
      ACLs containing <code class="option">geoip</code> or <code class="option">ecs</code>
      elements can match against the the address encoded in the option.
      This can be used to select a view for a query, so that different
      answers can be provided depending on the client network.
    </p></li>
<li class="listitem"><p>
      The EDNS EXPIRE option has been implemented on the client
      side, allowing a slave server to set the expiration timer
      correctly when transferring zone data from another slave
      server.
    </p></li>
<li class="listitem"><p>
      A new <code class="option">masterfile-style</code> zone option controls
      the formatting of text zone files:  When set to
      <code class="literal">full</code>, the zone file will dumped in
      single-line-per-record format.
    </p></li>
<li class="listitem"><p>
      <span class="command"><strong>dig +ednsopt</strong></span> can now be used to set
      arbitrary EDNS options in DNS requests.
    </p></li>
<li class="listitem"><p>
      <span class="command"><strong>dig +ednsflags</strong></span> can now be used to set
      yet-to-be-defined EDNS flags in DNS requests.
    </p></li>
<li class="listitem"><p>
      <span class="command"><strong>dig +[no]ednsnegotiation</strong></span> can now be used enable /
      disable EDNS version negotiation.
    </p></li>
<li class="listitem"><p>
      <span class="command"><strong>dig +header-only</strong></span> can now be used to send
      queries without a question section.
    </p></li>
<li class="listitem"><p>
      <span class="command"><strong>dig +ttlunits</strong></span> causes <span class="command"><strong>dig</strong></span>
      to print TTL values with time-unit suffixes: w, d, h, m, s for
      weeks, days, hours, minutes, and seconds.
    </p></li>
<li class="listitem"><p>
      <span class="command"><strong>dig +zflag</strong></span> can be used to set the last
      unassigned DNS header flag bit.  This bit in normally zero.
    </p></li>
<li class="listitem"><p>
      <span class="command"><strong>dig +dscp=<em class="replaceable"><code>value</code></em></strong></span>
      can now be used to set the DSCP code point in outgoing query
      packets.
    </p></li>
<li class="listitem"><p>
      <code class="option">serial-update-method</code> can now be set to
      <code class="literal">date</code>. On update, the serial number will
      be set to the current date in YYYYMMDDNN format.
    </p></li>
<li class="listitem"><p>
      <span class="command"><strong>dnssec-signzone -N date</strong></span> also sets the serial
      number to YYYYMMDDNN.
    </p></li>
<li class="listitem"><p>
      <span class="command"><strong>named -L <em class="replaceable"><code>filename</code></em></strong></span>
      causes <span class="command"><strong>named</strong></span> to send log messages to the specified file by
      default instead of to the system log.
    </p></li>
<li class="listitem"><p>
      The rate limiter configured by the
      <code class="option">serial-query-rate</code> option no longer covers
      NOTIFY messages; those are now separately controlled by
      <code class="option">notify-rate</code> and
      <code class="option">startup-notify-rate</code> (the latter of which
      controls the rate of NOTIFY messages sent when the server
      is first started up or reconfigured).
    </p></li>
<li class="listitem"><p>
      The default number of tasks and client objects available
      for serving lightweight resolver queries have been increased,
      and are now configurable via the new <code class="option">lwres-tasks</code>
      and <code class="option">lwres-clients</code> options in
      <code class="filename">named.conf</code>. [RT #35857]
    </p></li>
<li class="listitem"><p>
      Log output to files can now be buffered by specifying
      <span class="command"><strong>buffered yes;</strong></span> when creating a channel.
    </p></li>
<li class="listitem"><p>
      <span class="command"><strong>delv +tcp</strong></span> will exclusively use TCP when
      sending queries.
    </p></li>
<li class="listitem"><p>
      <span class="command"><strong>named</strong></span> will now check to see whether
      other name server processes are running before starting up.
      This is implemented in two ways: 1) by refusing to start
      if the configured network interfaces all return "address
      in use", and 2) by attempting to acquire a lock on a file
      specified by the <code class="option">lock-file</code> option or
      the <span class="command"><strong>-X</strong></span> command line option.  The
      default lock file is
      <code class="filename">/var/run/named/named.lock</code>.
      Specifying <code class="literal">none</code> will disable the lock
      file check.
    </p></li>
<li class="listitem"><p>
      <span class="command"><strong>rndc delzone</strong></span> can now be applied to zones
      which were configured in <code class="filename">named.conf</code>;
      it is no longer restricted to zones which were added by
      <span class="command"><strong>rndc addzone</strong></span>.  (Note, however, that
      this does not edit <code class="filename">named.conf</code>; the zone
      must be removed from the configuration or it will return
      when <span class="command"><strong>named</strong></span> is restarted or reloaded.)
    </p></li>
<li class="listitem"><p>
      <span class="command"><strong>rndc modzone</strong></span> can be used to reconfigure
      a zone, using similar syntax to <span class="command"><strong>rndc addzone</strong></span>.
    </p></li>
<li class="listitem"><p>
      <span class="command"><strong>rndc showzone</strong></span> displays the current
      configuration for a specified zone.
    </p></li>
<li class="listitem">
<p>
      Added server-side support for pipelined TCP queries.  Clients
      may continue sending queries via TCP while previous queries are
      processed in parallel.  Responses are sent when they are
      ready, not necessarily in the order in which the queries were
      received.
    </p>
<p>
      To revert to the former behavior for a particular
      client address or range of addresses, specify the address prefix
      in the "keep-response-order" option.  To revert to the former
      behavior for all clients, use "keep-response-order { any; };".
    </p>
</li>
<li class="listitem"><p>
      The new <span class="command"><strong>mdig</strong></span> command is a version of
      <span class="command"><strong>dig</strong></span> that sends multiple pipelined
      queries and then waits for responses, instead of sending one
      query and waiting the response before sending the next. [RT #38261]
    </p></li>
<li class="listitem"><p>
      To enable better monitoring and troubleshooting of RFC 5011
      trust anchor management, the new <span class="command"><strong>rndc managed-keys</strong></span>
      can be used to check status of trust anchors or to force keys
      to be refreshed.  Also, the managed-keys data file now has
      easier-to-read comments. [RT #38458]
    </p></li>
<li class="listitem"><p>
      An <span class="command"><strong>--enable-querytrace</strong></span> configure switch is
      now available to enable very verbose query tracelogging. This
      option can only be set at compile time. This option has a
      negative performance impact and should be used only for
      debugging. [RT #37520]
    </p></li>
<li class="listitem"><p>
      A new <span class="command"><strong>tcp-only</strong></span> option can be specified
      in <span class="command"><strong>server</strong></span> statements to force
      <span class="command"><strong>named</strong></span> to connect to the specified
      server via TCP. [RT #37800]
    </p></li>
<li class="listitem"><p>
      The <span class="command"><strong>nxdomain-redirect</strong></span> option specifies
      a DNS namespace to use for NXDOMAIN redirection. When a
      recursive lookup returns NXDOMAIN, a second lookup is
      initiated with the specified name appended to the query
      name. This allows NXDOMAIN redirection data to be supplied
      by multiple zones configured on the server or by recursive
      queries to other servers. (The older method, using
      a single <span class="command"><strong>type redirect</strong></span> zone, has
      better average performance but is less flexible.) [RT #37989]
    </p></li>
<li class="listitem"><p>
      The following types have been implemented: CSYNC, NINFO, RKEY,
      SINK, TA, TALINK.
    </p></li>
<li class="listitem"><p>
      A new <span class="command"><strong>message-compression</strong></span> option can be
      used to specify whether or not to use name compression when
      answering queries. Setting this to <strong class="userinput"><code>no</code></strong>
      results in larger responses, but reduces CPU consumption and
      may improve throughput.  The default is <strong class="userinput"><code>yes</code></strong>.
    </p></li>
<li class="listitem"><p>
      A "read-only" clause is now available for non-destructive
      control channel access. In such cases, a restricted set of
      rndc commands are allowed for querying information from named.
      By default, control channel access is read-write.
    </p></li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_changes"></a>Feature Changes</h3></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
      ACLs containing <span class="command"><strong>geoip asnum</strong></span> elements were
      not correctly matched unless the full organization name was
      specified in the ACL (as in
      <span class="command"><strong>geoip asnum "AS1234 Example, Inc.";</strong></span>).
      They can now match against the AS number alone (as in
      <span class="command"><strong>geoip asnum "AS1234";</strong></span>).
    </p></li>
<li class="listitem"><p>
      When using native PKCS#11 cryptography (i.e.,
      <span class="command"><strong>configure --enable-native-pkcs11</strong></span>) HSM PINs
      of up to 256 characters can now be used.
    </p></li>
<li class="listitem"><p>
      NXDOMAIN responses to queries of type DS are now cached separately
      from those for other types. This helps when using "grafted" zones
      of type forward, for which the parent zone does not contain a
      delegation, such as local top-level domains.  Previously a query
      of type DS for such a zone could cause the zone apex to be cached
      as NXDOMAIN, blocking all subsequent queries.  (Note: This
      change is only helpful when DNSSEC validation is not enabled.
      "Grafted" zones without a delegation in the parent are not a
      recommended configuration.)
    </p></li>
<li class="listitem"><p>
      Update forwarding performance has been improved by allowing
      a single TCP connection to be shared between multiple updates.
    </p></li>
<li class="listitem"><p>
      By default, <span class="command"><strong>nsupdate</strong></span> will now check
      the correctness of hostnames when adding records of type
      A, AAAA, MX, SOA, NS, SRV or PTR.  This behavior can be
      disabled with <span class="command"><strong>check-names no</strong></span>.
    </p></li>
<li class="listitem"><p>
      Added support for OPENPGPKEY type.
    </p></li>
<li class="listitem"><p>
      The names of the files used to store managed keys and added
      zones for each view are no longer based on the SHA256 hash
      of the view name, except when this is necessary because the
      view name contains characters that would be incompatible with use
      as a file name.  For views whose names do not contain forward
      slashes ('/'), backslashes ('\'), or capital letters - which
      could potentially cause namespace collision problems on
      case-insensitive filesystems - files will now be named
      after the view (for example, <code class="filename">internal.mkeys</code>
      or <code class="filename">external.nzf</code>).  However, to ensure
      consistent behavior when upgrading, if a file using the old
      name format is found to exist, it will continue to be used.
    </p></li>
<li class="listitem"><p>
      "rndc" can now return text output of arbitrary size to
      the caller. (Prior to this, certain commands such as
      "rndc tsig-list" and "rndc zonestatus" could return
      truncated output.)
    </p></li>
<li class="listitem"><p>
      Errors reported when running <span class="command"><strong>rndc addzone</strong></span>
      (e.g., when a zone file cannot be loaded) have been clarified
      to make it easier to diagnose problems.
    </p></li>
<li class="listitem"><p>
      When encountering an authoritative name server whose name is
      an alias pointing to another name, the resolver treats
      this as an error and skips to the next server. Previously
      this happened silently; now the error will be logged to
      the newly-created "cname" log category.
    </p></li>
<li class="listitem"><p>
      If <span class="command"><strong>named</strong></span> is not configured to validate the answer then
      allow fallback to plain DNS on timeout even when we know
      the server supports EDNS.  This will allow the server to
      potentially resolve signed queries when TCP is being
      blocked.
    </p></li>
<li class="listitem"><p>
      Large inline-signing changes should be less disruptive.
      Signature generation is now done incrementally; the number
      of signatures to be generated in each quantum is controlled
      by "sig-signing-signatures <em class="replaceable"><code>number</code></em>;".
      [RT #37927]
    </p></li>
<li class="listitem">
<p>
      The experimental SIT option (code point 65001) of BIND
      9.10.0 through BIND 9.10.2 has been replaced with the COOKIE
      option (code point 10). It is no longer experimental, and
      is sent by default, by both <span class="command"><strong>named</strong></span> and
      <span class="command"><strong>dig</strong></span>.
    </p>
<p>
      The SIT-related named.conf options have been marked as
      obsolete, and are otherwise ignored.
    </p>
</li>
<li class="listitem"><p>
      When <span class="command"><strong>dig</strong></span> receives a truncated (TC=1)
      response or a BADCOOKIE response code from a server, it
      will automatically retry the query using the server COOKIE
      that was returned by the server in its initial response.
      [RT #39047]
    </p></li>
<li class="listitem"><p>
      A alternative NXDOMAIN redirect method (nxdomain-redirect)
      which allows the redirect information to be looked up from
      a namespace on the Internet rather than requiring a zone
      to be configured on the server is now available.
    </p></li>
<li class="listitem"><p>
      Retrieving the local port range from net.ipv4.ip_local_port_range
      on Linux is now supported.
    </p></li>
<li class="listitem"><p>
      Within the <code class="option">response-policy</code> option, it is now
      possible to configure RPZ rewrite logging on a per-zone basis
      using the <code class="option">log</code> clause.
    </p></li>
<li class="listitem"><p>
      The default preferred glue is now the address type of the
       transport the query was received over.
    </p></li>
<li class="listitem"><p>
      On machines with 2 or more processors (CPU), the default value
      for the number of UDP listeners has been changed to the number
      of detected processors minus one.
    </p></li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_port"></a>Porting Changes</h3></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>
      The Microsoft Windows install tool
      <span class="command"><strong>BINDInstall.exe</strong></span> which requires a
      non-free version of Visual Studio to be built, now uses two
      files (lists of flags and files) created by the Configure
      perl script with all the needed information which were
      previously compiled in the binary. Read
      <code class="filename">win32utils/build.txt</code> for more details.
      [RT #38915]
    </p></li></ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_bugs"></a>Bug Fixes</h3></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
      <span class="command"><strong>dig</strong></span>, <span class="command"><strong>host</strong></span> and
      <span class="command"><strong>nslookup</strong></span> aborted when encountering
      a name which, after appending search list elements,
      exceeded 255 bytes. Such names are now skipped, but
      processing of other names will continue. [RT #36892]
    </p></li>
<li class="listitem"><p>
      The error message generated when
      <span class="command"><strong>named-checkzone</strong></span> or
      <span class="command"><strong>named-checkconf -z</strong></span> encounters a
      <code class="option">$TTL</code> directive without a value has
      been clarified. [RT #37138]
    </p></li>
<li class="listitem"><p>
      Semicolon characters (;) included in TXT records were
      incorrectly escaped with a backslash when the record was
      displayed as text. This is actually only necessary when there
      are no quotation marks. [RT #37159]
    </p></li>
<li class="listitem"><p>
      When files opened for writing by <span class="command"><strong>named</strong></span>,
      such as zone journal files, were referenced more than once
      in <code class="filename">named.conf</code>, it could lead to file
      corruption as multiple threads wrote to the same file. This
      is now detected when loading <code class="filename">named.conf</code>
      and reported as an error. [RT #37172]
    </p></li>
<li class="listitem"><p>
      When checking for updates to trust anchors listed in
      <code class="option">managed-keys</code>, <span class="command"><strong>named</strong></span>
      now revalidates keys based on the current set of
      active trust anchors, without relying on any cached
      record of previous validation. [RT #37506]
    </p></li>
<li class="listitem"><p>
      Large-system tuning
      (<span class="command"><strong>configure --with-tuning=large</strong></span>) caused
      problems on some platforms by setting a socket receive
      buffer size that was too large.  This is now detected and
      corrected at run time. [RT #37187]
    </p></li>
<li class="listitem"><p>
      When NXDOMAIN redirection is in use, queries for a name
      that is present in the redirection zone but a type that
      is not present will now return NOERROR instead of NXDOMAIN.
    </p></li>
<li class="listitem"><p>
      Due to an inadvertent removal of code in the previous
      release, when <span class="command"><strong>named</strong></span> encountered an
      authoritative name server which dropped all EDNS queries,
      it did not always try plain DNS. This has been corrected.
      [RT #37965]
    </p></li>
<li class="listitem"><p>
      A regression caused nsupdate to use the default recursive servers
      rather than the SOA MNAME server when sending the UPDATE.
    </p></li>
<li class="listitem"><p>
      Adjusted max-recursion-queries to accommodate the smaller
      initial packet sizes used in BIND 9.10 and higher when
      contacting authoritative servers for the first time.
    </p></li>
<li class="listitem"><p>
      Built-in "empty" zones did not correctly inherit the
      "allow-transfer" ACL from the options or view. [RT #38310]
    </p></li>
<li class="listitem"><p>
      Two leaks were fixed that could cause <span class="command"><strong>named</strong></span>
      processes to grow to very large sizes. [RT #38454]
    </p></li>
<li class="listitem"><p>
      Fixed some bugs in RFC 5011 trust anchor management,
      including a memory leak and a possible loss of state
      information. [RT #38458]
    </p></li>
<li class="listitem"><p>
      Asynchronous zone loads were not handled correctly when the
      zone load was already in progress; this could trigger a crash
      in zt.c. [RT #37573]
    </p></li>
<li class="listitem"><p>
      A race during shutdown or reconfiguration could
      cause an assertion failure in mem.c. [RT #38979]
    </p></li>
<li class="listitem"><p>
      Some answer formatting options didn't work correctly with
      <span class="command"><strong>dig +short</strong></span>. [RT #39291]
    </p></li>
<li class="listitem">
<p>
      Several bugs have been fixed in the RPZ implementation:
    </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
<li class="listitem"><p>
          Policy zones that did not specifically require recursion
          could be treated as if they did; consequently, setting
          <span class="command"><strong>qname-wait-recurse no;</strong></span> was
          sometimes ineffective.  This has been corrected.
          In most configurations, behavioral changes due to this
          fix will not be noticeable. [RT #39229]
        </p></li>
<li class="listitem"><p>
          The server could crash if policy zones were updated (e.g.
          via <span class="command"><strong>rndc reload</strong></span> or an incoming zone
          transfer) while RPZ processing was still ongoing for an
          active query. [RT #39415]
        </p></li>
<li class="listitem"><p>
          On servers with one or more policy zones configured as
          slaves, if a policy zone updated during regular operation
          (rather than at startup) using a full zone reload, such as
          via AXFR, a bug could allow the RPZ summary data to fall out
          of sync, potentially leading to an assertion failure in
          rpz.c when further incremental updates were made to the
          zone, such as via IXFR. [RT #39567]
        </p></li>
<li class="listitem"><p>
          The server could match a shorter prefix than what was
          available in CLIENT-IP policy triggers, and so, an
          unexpected action could be taken. This has been
          corrected. [RT #39481]
        </p></li>
<li class="listitem"><p>
          The server could crash if a reload of an RPZ zone was
          initiated while another reload of the same zone was
          already in progress. [RT #39649]
        </p></li>
<li class="listitem"><p>
          Negative trust anchors (NTAs) were incorrectly deleted
          when the server was reloaded or reconfigured. [RT #41058]
        </p></li>
</ul></div>
</li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="end_of_life"></a>End of Life</h3></div></div></div>
<p>
      The end of life for BIND 9.11 is yet to be determined but
      will not be before BIND 9.13.0 has been released for 6 months.
      <a class="link" href="https://www.isc.org/downloads/software-support-policy/" target="_top">https://www.isc.org/downloads/software-support-policy/</a>
    </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_thanks"></a>Thank You</h3></div></div></div>
<p>
      Thank you to everyone who assisted us in making this release possible.
      If you would like to contribute to ISC to assist us in continuing to
      make quality open source software, please visit our donations page at
      <a class="link" href="http://www.isc.org/donate/" target="_top">http://www.isc.org/donate/</a>.
    </p>
</div>
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