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<title>Appendix A. Release Notes</title>
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<tr><th colspan="3" align="center">Appendix A. Release Notes</th></tr>
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<a accesskey="p" href="Bv9ARM.ch07.html">Prev</a> </td>
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<div class="appendix">
<div class="titlepage"><div><div><h1 class="title">
<a name="Bv9ARM.ch08"></a>Release Notes</h1></div></div></div>
<div class="toc">
<p><b>Table of Contents</b></p>
<dl class="toc">
<dt><span class="section"><a href="Bv9ARM.ch08.html#id-1.9.2">Release Notes for BIND Version 9.17.0</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="Bv9ARM.ch08.html#relnotes_intro">Introduction</a></span></dt>
<dt><span class="section"><a href="Bv9ARM.ch08.html#relnotes_platforms">Supported Platforms</a></span></dt>
<dt><span class="section"><a href="Bv9ARM.ch08.html#relnotes_download">Download</a></span></dt>
<dt><span class="section"><a href="Bv9ARM.ch08.html#relnotes-9.17.0">Notes for BIND 9.17.0</a></span></dt>
<dt><span class="section"><a href="Bv9ARM.ch08.html#relnotes_license">License</a></span></dt>
<dt><span class="section"><a href="Bv9ARM.ch08.html#end_of_life">End of Life</a></span></dt>
<dt><span class="section"><a href="Bv9ARM.ch08.html#relnotes_thanks">Thank You</a></span></dt>
</dl></dd>
</dl>
</div>
<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="id-1.9.2"></a>Release Notes for BIND Version 9.17.0</h2></div></div></div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_intro"></a>Introduction</h3></div></div></div>
<p>
BIND 9.17 is an unstable development release of BIND.
This document summarizes new features and functional changes that
have been introduced on this branch. With each development release
leading up to the stable BIND 9.18 release, this document will be
updated with additional features added and bugs fixed.
</p>
<p>
Please see the file <code class="filename">CHANGES</code> for a more
detailed list of changes and bug fixes.
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_platforms"></a>Supported Platforms</h3></div></div></div>
<p>
To build on UNIX-like systems, BIND requires support for POSIX.1c
threads (IEEE Std 1003.1c-1995), the Advanced Sockets API for
IPv6 (RFC 3542), and standard atomic operations provided by the
C compiler.
</p>
<p>
The <code class="filename">libuv</code> asynchronous I/O library and the
OpenSSL cryptography library must be available for the target
platform. A PKCS#11 provider can be used instead of OpenSSL for
Public Key cryptography (i.e., DNSSEC signing and validation),
but OpenSSL is still required for general cryptography operations
such as hashing and random number generation.
</p>
<p>
More information can be found in the <code class="filename">PLATFORMS.md</code>
file that is included in the source distribution of BIND 9. If your
compiler and system libraries provide the above features, BIND 9
should compile and run. If that isn't the case, the BIND
development team will generally accept patches that add support
for systems that are still supported by their respective vendors.
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_download"></a>Download</h3></div></div></div>
<p>
The latest versions of BIND 9 software can always be found at
<a class="link" href="https://www.isc.org/download/" target="_top">https://www.isc.org/download/</a>.
There you will find additional information about each release,
source code, and pre-compiled versions for Microsoft Windows
operating systems.
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes-9.17.0"></a>Notes for BIND 9.17.0</h3></div></div></div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="relnotes-9.17.0-known"></a>Known Issues</h4></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
<p>
UDP network ports used for listening can no longer simultaneously be
used for sending traffic. An example configuration which triggers
this issue would be one which uses the same
<em class="replaceable"><code>address:port</code></em> pair for
<span class="command"><strong>listen-on(-v6)</strong></span> statements as for
<span class="command"><strong>notify-source(-v6)</strong></span> or
<span class="command"><strong>transfer-source(-v6)</strong></span>. While this issue affects all
operating systems, it only triggers log messages (e.g. "unable to
create dispatch for reserved port") on some of them. There are
currently no plans to make such a combination of settings work again.
</p>
</li></ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="relnotes-9.17.0-new"></a>New Features</h4></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
<p>
When a secondary server receives a large incremental zone
transfer (IXFR), it can have a negative impact on query
performance while the incremental changes are applied to
the zone. To address this, <span class="command"><strong>named</strong></span> can now
limit the size of IXFR responses it sends in response to zone
transfer requests. If an IXFR response would be larger than an
AXFR of the entire zone, it will send an AXFR response instead.
</p>
<p>
This behavior is controlled by the <span class="command"><strong>max-ixfr-ratio</strong></span>
option - a percentage value representing the ratio of IXFR size
to the size of a full zone transfer. The default is
<code class="literal">100%</code>. [GL #1515]
</p>
</li></ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="relnotes-9.17.0-changes"></a>Feature Changes</h4></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p>
The system-provided POSIX Threads read-write lock implementation is
now used by default instead of the native BIND 9 implementation.
Please be aware that glibc versions 2.26 through 2.29 had a
<a class="link" href="https://sourceware.org/bugzilla/show_bug.cgi?id=23844" target="_top">bug</a>
that could cause BIND 9 to deadlock. A fix was released in glibc 2.30,
and most current Linux distributions have patched or updated glibc,
with the notable exception of Ubuntu 18.04 (Bionic) which is a work in
progress. If you are running on an affected operating system, compile
BIND 9 with <span class="command"><strong>--disable-pthread-rwlock</strong></span> until a fixed
version of glibc is available. [GL !3125]
</p>
</li>
<li class="listitem">
<p>
The <span class="command"><strong>rndc nta -dump</strong></span> and
<span class="command"><strong>rndc secroots</strong></span> commands now both include
<span class="command"><strong>validate-except</strong></span> entries when listing negative
trust anchors. These are indicated by the keyword
<code class="literal">permanent</code> in place of the expiry
date. [GL #1532]
</p>
</li>
</ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="relnotes-9.17.0-bugs"></a>Bug Fixes</h4></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
<p>
Fixed re-signing issues with inline zones which resulted in
records being re-signed late or not at all.
</p>
</li></ul></div>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="relnotes_license"></a>License</h3></div></div></div>
<p>
BIND 9 is open source software licensed under the terms of the Mozilla
Public License, version 2.0 (see the <code class="filename">LICENSE</code>
file for the full text).
</p>
<p>
The license requires that if you make changes to BIND and distribute
them outside your organization, those changes must be published under
the same license. It does not require that you publish or disclose
anything other than the changes you have made to our software. This
requirement does not affect anyone who is using BIND, with or without
modifications, without redistributing it, nor anyone redistributing
BIND without changes.
</p>
<p>
Those wishing to discuss license compliance may contact ISC at
<a class="link" href="https://www.isc.org/contact/" target="_top">
https://www.isc.org/contact/</a>.
</p>
</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>
BIND 9.17 is an unstable development branch. When its development
is complete, it will be renamed to BIND 9.18, which will be a
stable branch.
</p>
<p>
The end of life date for BIND 9.18 has not yet been determined.
For those needing long term support, the current Extended Support
Version (ESV) is BIND 9.11, which will be supported until at
least December 2021.
</p>
<p>
See
<a class="link" href="https://kb.isc.org/docs/aa-00896" target="_top">https://kb.isc.org/docs/aa-00896</a>
for details of ISC's software support policy.
</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.
</p>
</div>
</div>
</div>
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<td width="20%" align="center"> </td>
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</td>
</tr>
<tr>
<td width="40%" align="left" valign="top">Chapter 7. Troubleshooting </td>
<td width="20%" align="center"><a accesskey="h" href="Bv9ARM.html">Home</a></td>
<td width="40%" align="right" valign="top"> Appendix B. A Brief History of the <acronym class="acronym">DNS</acronym> and <acronym class="acronym">BIND</acronym>
</td>
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<p xmlns:db="http://docbook.org/ns/docbook" style="text-align: center;">BIND 9.17.0 (Development Release)</p>
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