doc/arm/notes.html

	notes.html revision 1609eab3caf63287d1caa0d3f8b4819a0c2becff
6ea1b817e31b89a627e146fe69e23ea0a64c89ecBob Halley<!--
b0e8629055a766d4555a005a283c2889a5974945Mark Andrews -
75c0816e8295e180f4bc7f10db3d0d880383bc1cMark Andrews - Permission to use, copy, modify, and/or distribute this software for any
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein - purpose with or without fee is hereby granted, provided that the above
6ea1b817e31b89a627e146fe69e23ea0a64c89ecBob Halley - copyright notice and this permission notice appear in all copies.
6ea1b817e31b89a627e146fe69e23ea0a64c89ecBob Halley -
6ea1b817e31b89a627e146fe69e23ea0a64c89ecBob Halley - THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein - REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
8a66318e41ed14c5a88130e8c362610e8faa2121Mark Andrews - AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
8a66318e41ed14c5a88130e8c362610e8faa2121Mark Andrews - INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein - LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
8a66318e41ed14c5a88130e8c362610e8faa2121Mark Andrews - OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
8a66318e41ed14c5a88130e8c362610e8faa2121Mark Andrews - PERFORMANCE OF THIS SOFTWARE.
8a66318e41ed14c5a88130e8c362610e8faa2121Mark Andrews-->
8a66318e41ed14c5a88130e8c362610e8faa2121Mark Andrews<!-- $Id$ -->
6ea1b817e31b89a627e146fe69e23ea0a64c89ecBob Halley<html>
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater<head>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<title></title>
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e21a2904f02a03fa06b6db04d348f65fe9c67b2bMark Andrews<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="article"><div class="section">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<div class="titlepage"></div>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<span style="color: red">&lt;title&gt;Release Notes for BIND Version 9.11.0pre-alpha&lt;/title&gt;</span><div class="section">
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews<div class="titlepage"><div><div><h3 class="title">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<a name="relnotes_intro"></a>Introduction</h3></div></div></div>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      This document summarizes changes since the last production release
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      of BIND on the corresponding major release branch.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein</div>
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater<div class="section">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<div class="titlepage"><div><div><h3 class="title">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<a name="relnotes_download"></a>Download</h3></div></div></div>
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      The latest versions of BIND 9 software can always be found at
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      <a class="link" href="http://www.isc.org/downloads/" target="_top">http://www.isc.org/downloads/</a>.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      There you will find additional information about each release,
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      source code, and pre-compiled versions for Microsoft Windows
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      operating systems.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein</div>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<div class="section">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<div class="titlepage"><div><div><h3 class="title">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<a name="relnotes_security"></a>Security Fixes</h3></div></div></div>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<li class="listitem"><p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      Insufficient testing when parsing a message allowed
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      records with an incorrect class to be be accepted,
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater      triggering a REQUIRE failure when those records
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      were subsequently cached.  This flaw is disclosed
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      in CVE-2015-8000. [RT #40987]
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p></li>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<li class="listitem"><p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      Incorrect reference counting could result in an INSIST
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      failure if a socket error occurred while performing a
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      lookup.  This flaw is disclosed in CVE-2015-8461. [RT#40945]
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p></li>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<li class="listitem"><p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      An incorrect boundary check in the OPENPGPKEY rdatatype
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      could trigger an assertion failure. This flaw is disclosed
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      in CVE-2015-5986. [RT #40286]
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p></li>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<li class="listitem">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      A buffer accounting error could trigger an assertion failure
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      when parsing certain malformed DNSSEC keys.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      This flaw was discovered by Hanno B�ck of the Fuzzing
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      Project, and is disclosed in CVE-2015-5722. [RT #40212]
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein</li>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<li class="listitem">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      A specially crafted query could trigger an assertion failure
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      in message.c.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      This flaw was discovered by Jonathan Foote, and is disclosed
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      in CVE-2015-5477. [RT #40046]
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein</li>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<li class="listitem">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      On servers configured to perform DNSSEC validation, an
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      assertion failure could be triggered on answers from
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      a specially configured server.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
a1b05dea35aa30b152a47115e18bbe679d3fcf19Mark Andrews      This flaw was discovered by Breno Silveira Soares, and is
a1b05dea35aa30b152a47115e18bbe679d3fcf19Mark Andrews      disclosed in CVE-2015-4620. [RT #39795]
a1b05dea35aa30b152a47115e18bbe679d3fcf19Mark Andrews    </p>
a1b05dea35aa30b152a47115e18bbe679d3fcf19Mark Andrews</li>
a1b05dea35aa30b152a47115e18bbe679d3fcf19Mark Andrews<li class="listitem">
a1b05dea35aa30b152a47115e18bbe679d3fcf19Mark Andrews<p>
a1b05dea35aa30b152a47115e18bbe679d3fcf19Mark Andrews      On servers configured to perform DNSSEC validation using
a1b05dea35aa30b152a47115e18bbe679d3fcf19Mark Andrews      managed trust anchors (i.e., keys configured explicitly
a1b05dea35aa30b152a47115e18bbe679d3fcf19Mark Andrews      via <span class="command"><strong>managed-keys</strong></span>, or implicitly
a1b05dea35aa30b152a47115e18bbe679d3fcf19Mark Andrews      via <span class="command"><strong>dnssec-validation auto;</strong></span> or
a1b05dea35aa30b152a47115e18bbe679d3fcf19Mark Andrews      <span class="command"><strong>dnssec-lookaside auto;</strong></span>), revoking
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      a trust anchor and sending a new untrusted replacement
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      could cause <span class="command"><strong>named</strong></span> to crash with an
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      assertion failure. This could occur in the event of a
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      botched key rollover, or potentially as a result of a
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      deliberate attack if the attacker was in position to
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      monitor the victim's DNS traffic.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      This flaw was discovered by Jan-Piet Mens, and is
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      disclosed in CVE-2015-1349. [RT #38344]
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein</li>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<li class="listitem">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      A flaw in delegation handling could be exploited to put
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      <span class="command"><strong>named</strong></span> into an infinite loop, in which
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      each lookup of a name server triggered additional lookups
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      of more name servers.  This has been addressed by placing
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      limits on the number of levels of recursion
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      <span class="command"><strong>named</strong></span> will allow (default 7), and
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      on the number of queries that it will send before
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      terminating a recursive query (default 50).
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      The recursion depth limit is configured via the
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      <code class="option">max-recursion-depth</code> option, and the query limit
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      via the <code class="option">max-recursion-queries</code> option.
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater    </p>
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater<p>
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater      The flaw was discovered by Florian Maury of ANSSI, and is
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater      disclosed in CVE-2014-8500. [RT #37580]
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater    </p>
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater</li>
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater<li class="listitem">
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater<p>
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater      Two separate problems were identified in BIND's GeoIP code that
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater      could lead to an assertion failure. One was triggered by use of
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater      both IPv4 and IPv6 address families, the other by referencing
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater      a GeoIP database in <code class="filename">named.conf</code> which was
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater      not installed. Both are covered by CVE-2014-8680. [RT #37672]
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater      [RT #37679]
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater    </p>
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater<p>
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater      A less serious security flaw was also found in GeoIP: changes
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater      to the <span class="command"><strong>geoip-directory</strong></span> option in
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater      <code class="filename">named.conf</code> were ignored when running
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater      <span class="command"><strong>rndc reconfig</strong></span>. In theory, this could allow
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater      <span class="command"><strong>named</strong></span> to allow access to unintended clients.
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater    </p>
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater</li>
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater<li class="listitem"><p>
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater      Specific APL data could trigger an INSIST.  This flaw
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      is disclosed in CVE-2015-8704. [RT #41396]
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p></li>
d71e2e0c61df16ff37c9934c371a4a60c08974f7Mark Andrews<li class="listitem"><p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      Certain errors that could be encountered when printing out
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      or logging an OPT record containing a CLIENT-SUBNET option
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      could be mishandled, resulting in an assertion failure.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      This flaw is disclosed in CVE-2015-8705. [RT #41397]
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p></li>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<li class="listitem"><p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      Malformed control messages can trigger assertions in named
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      and rndc. This flaw is disclosed in CVE-2016-1285. [RT
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      #41666]
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p></li>
d71e2e0c61df16ff37c9934c371a4a60c08974f7Mark Andrews</ul></div>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein</div>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<div class="section">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<div class="titlepage"><div><div><h3 class="title">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<a name="relnotes_features"></a>New Features</h3></div></div></div>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<li class="listitem">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
d71e2e0c61df16ff37c9934c371a4a60c08974f7Mark Andrews      Added support for DynDB, a new interface for loading zone data
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      from an external database, developed by Red Hat for the FreeIPA
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      project.  (Thanks in particular to Adam Tkac and Petr
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      Spacek of Red Hat for the contribution.)
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      Unlike the existing DLZ and SDB interfaces, which provide a
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      limited subset of database functionality within BIND &#8212;
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      translating DNS queries into real-time database lookups with
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      relatively poor performance and with no ability to handle
d71e2e0c61df16ff37c9934c371a4a60c08974f7Mark Andrews      DNSSEC-signed data &#8212; DynDB is able to fully implement
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      and extend the database API used natively by BIND.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      A DynDB module could pre-load data from an external data
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      source, then serve it with the same performance and
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      functionality as conventional BIND zones, and with the
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      ability to take advantage of database features not
d71e2e0c61df16ff37c9934c371a4a60c08974f7Mark Andrews      available in BIND, such as multi-master replication.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein</li>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<li class="listitem">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      New quotas have been added to limit the queries that are
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      sent by recursive resolvers to authoritative servers
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      experiencing denial-of-service attacks. When configured,
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      these options can both reduce the harm done to authoritative
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      servers and also avoid the resource exhaustion that can be
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      experienced by recursives when they are being used as a
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      vehicle for such an attack.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<li class="listitem"><p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein          <code class="option">fetches-per-server</code> limits the number of
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein          simultaneous queries that can be sent to any single
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein          authoritative server.  The configured value is a starting
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein          point; it is automatically adjusted downward if the server is
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein          partially or completely non-responsive. The algorithm used to
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein          adjust the quota can be configured via the
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein          <code class="option">fetch-quota-params</code> option.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein        </p></li>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<li class="listitem"><p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein          <code class="option">fetches-per-zone</code> limits the number of
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein          simultaneous queries that can be sent for names within a
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater          single domain.  (Note: Unlike "fetches-per-server", this
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein          value is not self-tuning.)
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein        </p></li>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein</ul></div>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      Statistics counters have also been added to track the number
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      of queries affected by these quotas.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein</li>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<li class="listitem">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      Added support for <span class="command"><strong>dnstap</strong></span>, a fast,
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      flexible method for capturing and logging DNS traffic,
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      developed by Robert Edmonds at Farsight Security, Inc.,
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      whose assistance is gratefully acknowledged.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      To enable <span class="command"><strong>dnstap</strong></span> at compile time,
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      the <span class="command"><strong>fstrm</strong></span> and <span class="command"><strong>protobuf-c</strong></span>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      libraries must be available, and BIND must be configured with
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      <code class="option">--enable-dnstap</code>.
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      A new utility <span class="command"><strong>dnstap-read</strong></span> has been added
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      to allow <span class="command"><strong>dnstap</strong></span> data to be presented in
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      a human-readable format.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      For more information on <span class="command"><strong>dnstap</strong></span>, see
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      <a class="link" href="http://dnstap.info" target="_top">http://dnstap.info</a>.
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater    </p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein</li>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<li class="listitem"><p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      New statistics counters have been added to track traffic
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      sizes, as specified in RSSAC002.  Query and response
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      message sizes are broken up into ranges of histogram buckets:
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      TCP and UDP queries of size 0-15, 16-31, ..., 272-288, and 288+,
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      and TCP and UDP responses of size 0-15, 16-31, ..., 4080-4095,
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      and 4096+.  These values can be accessed via the XML and JSON
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      statistics channels at, for example,
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      <a class="link" href="http://localhost:8888/xml/v3/traffic" target="_top">http://localhost:8888/xml/v3/traffic</a>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      or
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      <a class="link" href="http://localhost:8888/json/v1/traffic" target="_top">http://localhost:8888/json/v1/traffic</a>.
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater    </p></li>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<li class="listitem"><p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      The serial number of a dynamically updatable zone can
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      now be set using
1224c3b69b3d18f7127aa042644936af25a2d679Mark Andrews      <span class="command"><strong>rndc signing -serial <em class="replaceable"><code>number</code></em> <em class="replaceable"><code>zonename</code></em></strong></span>.
1224c3b69b3d18f7127aa042644936af25a2d679Mark Andrews      This is particularly useful with <code class="option">inline-signing</code>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      zones that have been reset.  Setting the serial number to a value
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      larger than that on the slaves will trigger an AXFR-style
f051d76c87e055c6ea3879e0c97a76609df915ccMark Andrews      transfer.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein    </p></li>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<li class="listitem"><p>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      When answering recursive queries, SERVFAIL responses can now be
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      cached by the server for a limited time; subsequent queries for
c4d99a62407cebca29653666ae11f87e4f56ebbcAutomatic Updater      the same query name and type will return another SERVFAIL until
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      the cache times out.  This reduces the frequency of retries
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      when a query is persistently failing, which can be a burden
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      on recursive serviers.  The SERVFAIL cache timeout is controlled
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      by <code class="option">servfail-ttl</code>, which defaults to 1 second
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein      and has an upper limit of 30.
    </p></li>
<li class="listitem"><p>
      The new <span class="command"><strong>rndc nta</strong></span> command can now be used to
      set a "negative trust anchor" (NTA), disabling DNSSEC validation for
      a specific domain; this can be used when responses from a domain
      are known to be failing validation due to administrative error
      rather than because of a spoofing attack. NTAs are strictly
      temporary; by default they expire after one hour, but can be
      configured to last up to one week.  The default NTA lifetime
      can be changed by setting the <code class="option">nta-lifetime</code> in
      <code class="filename">named.conf</code>. When added, NTAs are stored in a
      file (<code class="filename"><em class="replaceable"><code>viewname</code></em>.nta</code>)
      in order to persist across restarts of the <span class="command"><strong>named</strong></span> server.
    </p></li>
<li class="listitem"><p>
      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>
      <span class="command"><strong>dig +mapped</strong></span> can now be used to determine
      if mapped IPv4 addresses can be used.
    </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>
      The timers returned by the statistics channel (indicating current
      time, server boot time, and most recent reconfiguration time) are
      now reported with millisecond accuracy. [RT #40082]
    </p></li>
<li class="listitem"><p>
      Updated the compiled in addresses for H.ROOT-SERVERS.NET.
    </p></li>
<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>
<li class="listitem"><p>
      Zone transfers now use smaller message sizes to improve
      message compression. This results in reduced network usage.
    </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>
      A flag could be set in the wrong field when setting up
      nonrecursive queries; this could cause the SERVFAIL cache to
      cache responses it shouldn't.  New querytrace logging has been
      added which identified this error. [RT #41155]
    </p></li>
<li class="listitem"><p>
      The server could crash due to a use-after-free if a
      zone transfer timed out. [RT #41297]
    </p></li>
<li class="listitem"><p>
      Authoritative servers that were marked as bogus (e.g. blackholed
      in configuration or with invalid addresses) were being queried
      anyway. [RT #41321]
    </p></li>
<li class="listitem"><p>
      Some of the options for GeoIP ACLs, including "areacode",
      "metrocode", and "timezone", were incorrectly documented
      as "area", "metro" and "tz".  Both the long and abbreviated
      versions are now accepted.
    </p></li>
<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>
<li class="listitem"><p>
          Zones configured to use <span class="command"><strong>map</strong></span> format
          master files can't be used as policy zones because RPZ
          summary data isn't compiled when such zones are mapped into
          memory.  This limitation may be fixed in a future release,
          but in the meantime it has been documented, and attempting
          to use such zones in <span class="command"><strong>response-policy</strong></span>
          statements is now a configuration error.  [RT #38321]
        </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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