release/doc/en_US.ISO8859-1/relnotes/article.xml

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   4 <!ENTITY % release PUBLIC "-//FreeBSD//ENTITIES Release Specification//EN" "release.ent">
   5  %release;
   6 <!ENTITY % sponsor PUBLIC "-//FreeBSD//ENTITIES Sponsor Specification//EN" "sponsor.ent">
   7  %sponsor;
   8 <!ENTITY % vendor PUBLIC "-//FreeBSD//ENTITIES Vendor Specification//EN" "vendor.ent">
   9  %vendor;
  10 <!ENTITY security SYSTEM "../../share/xml/security.xml">
  11 <!ENTITY errata SYSTEM "../../share/xml/errata.xml">
  12 ]>
  13 <article xmlns="http://docbook.org/ns/docbook"
  14   xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0">
  15
  16   <info>
  17     <title>&os; &release.current; Release Notes</title>
  18
  19     <author>
  20       <orgname>The &os; Project</orgname>
  21     </author>
  22
  23     <pubdate>$FreeBSD$</pubdate>
  24
  25     <!-- Last rev: 288943 -->
  26
  27     <copyright>
  28       <year>2017</year>
  29       <holder role="mailto:doc@FreeBSD.org">The &os; Documentation
  30         Project</holder>
  31     </copyright>
  32
  33     <legalnotice xml:id="trademarks" role="trademarks">
  34       &tm-attrib.freebsd;
  35       &tm-attrib.ibm;
  36       &tm-attrib.ieee;
  37       &tm-attrib.intel;
  38       &tm-attrib.sparc;
  39       &tm-attrib.general;
  40     </legalnotice>
  41
  42     <abstract>
  43       <para>The release notes for &os; &release.current; contain
  44         a summary of the changes made to the &os; base system on the
  45         &release.branch; development line.  This document lists
  46         applicable security advisories that were issued since the last
  47         release, as well as significant changes to the &os; kernel and
  48         userland.  Some brief remarks on upgrading are also
  49         presented.</para>
  50     </abstract>
  51   </info>
  52
  53   <sect1 xml:id="intro">
  54     <title>Introduction</title>
  55
  56     <para>This document contains the release notes for &os;
  57       &release.current;.  It describes recently added, changed, or
  58       deleted features of &os;.  It also provides some notes on
  59       upgrading from previous versions of &os;.</para>
  60
  61     <para releasetype="current">The &release.type; distribution to
  62       which these release notes apply represents the latest point
  63       along the &release.branch; development branch since
  64       &release.branch; was created.  Information regarding pre-built,
  65       binary &release.type; distributions along this branch can be
  66       found at <uri
  67         xlink:href="&release.url;">&release.url;</uri>.</para>
  68
  69     <para releasetype="snapshot">The &release.type; distribution to
  70       which these release notes apply represents a point along the
  71       &release.branch; development branch between &release.prev; and
  72       the future &release.next;.  Information regarding pre-built,
  73       binary &release.type; distributions along this branch can be
  74       found at <uri
  75         xlink:href="&release.url;">&release.url;</uri>.</para>
  76
  77     <para releasetype="release">This distribution of &os;
  78       &release.current; is a &release.type; distribution.  It can be
  79       found at <uri xlink:href="&release.url;">&release.url;</uri> or
  80       any of its mirrors.  More information on obtaining this (or
  81       other) &release.type; distributions of &os; can be found in the
  82       <link
  83         xlink:href="&url.books.handbook;/mirrors.html"><quote>Obtaining
  84           &os;</quote> appendix</link> to the <link
  85         xlink:href="&url.books.handbook;/">&os;
  86         Handbook</link>.</para>
  87
  88     <para>All users are encouraged to consult the release errata
  89       before installing &os;.  The errata document is updated with
  90       <quote>late-breaking</quote> information discovered late in the
  91       release cycle or after the release.  Typically, it contains
  92       information on known bugs, security advisories, and corrections
  93       to documentation.  An up-to-date copy of the errata for &os;
  94       &release.current; can be found on the &os; Web site.</para>
  95
  96     <para>This document describes the most user-visible new or changed
  97       features in &os; since &release.prev;.  In general, changes
  98       described here are unique to the &release.branch; branch unless
  99       specifically marked as &merged; features.</para>
 100
 101     <para>Typical release note items document recent security
 102       advisories issued after &release.prev;, new drivers or hardware
 103       support, new commands or options, major bug fixes, or
 104       contributed software upgrades.  They may also list changes to
 105       major ports/packages or release engineering practices.  Clearly
 106       the release notes cannot list every single change made to &os;
 107       between releases; this document focuses primarily on security
 108       advisories, user-visible changes, and major architectural
 109       improvements.</para>
 110   </sect1>
 111
 112   <sect1 xml:id="upgrade">
 113     <title>Upgrading from Previous Releases of &os;</title>
 114
 115     <para arch="amd64,i386">Binary upgrades between RELEASE versions
 116       (and snapshots of the various security branches) are supported
 117       using the &man.freebsd-update.8; utility.  The binary upgrade
 118       procedure will update unmodified userland utilities, as well as
 119       unmodified GENERIC kernels distributed as a part of an official
 120       &os; release.  The &man.freebsd-update.8; utility requires that
 121       the host being upgraded have Internet connectivity.</para>
 122
 123     <para>Source-based upgrades (those based on recompiling the &os;
 124       base system from source code) from previous versions are
 125       supported, according to the instructions in
 126       <filename>/usr/src/UPDATING</filename>.</para>
 127
 128     <important>
 129       <para>Upgrading &os; should only be attempted after backing up
 130         <emphasis>all</emphasis> data and configuration files.</para>
 131     </important>
 132   </sect1>
 133
 134   <sect1 xml:id="security-errata">
 135     <title>Security and Errata</title>
 136
 137     <para>This section lists the various Security Advisories and
 138       Errata Notices since &release.prev;.</para>
 139
 140     <sect2 xml:id="security">
 141       <title>Security Advisories</title>
 142
 143       &security;
 144     </sect2>
 145
 146     <sect2 xml:id="errata">
 147       <title>Errata Notices</title>
 148
 149       &errata;
 150     </sect2>
 151   </sect1>
 152
 153   <sect1 xml:id="userland">
 154     <title>Userland</title>
 155
 156     <para>This section covers changes and additions to userland
 157       applications, contributed software, and system utilities.</para>
 158
 159     <sect2 xml:id="userland-config">
 160       <title>Userland Configuration Changes</title>
 161
 162       <para revision="313203">The &man.inetd.8; utility can now be
 163         built without <literal>libwrap</literal> support when
 164         <literal>WITHOUT_TCP_WRAPPERS</literal> is set in
 165         &man.src.conf.5;.</para>
 166
 167       <para revision="316045">The &man.libthr.3; library and related
 168         files are now evaluated and removed by the
 169         <literal>delete-old-libs</literal> target when upgrading the
 170         system if <literal>WITHOUT_LIBTHR</literal> is
 171         set in &man.src.conf.5;.</para>
 172
 173       <para revision="316423" contrib="sponsor" sponsor="&ff;">The
 174         <literal>WITH_LLD_AS_LD</literal> build knob has been added,
 175         which installs <application>LLD</application> as
 176         <filename>/usr/bin/ld</filename> if set.</para>
 177     </sect2>
 178
 179     <sect2 xml:id="userland-programs">
 180       <title>Userland Application Changes</title>
 181
 182       <para revision="308720" contrib="sponsor" sponsor="&gandi;">The
 183         &man.cron.8; utility has been updated to add support for
 184         including files within <filename
 185           class="directory">/etc/cron.d</filename> and <filename
 186           class="directory">/usr/local/etc/cron.d</filename> by
 187         default.</para>
 188
 189       <para revision="308721" contrib="sponsor" sponsor="&gandi;">The
 190         &man.syslogd.8; utility has been updated to add the
 191         <literal>include</literal> keyword which allows specifying
 192         a directory containing configuration files to be included in
 193         addition to &man.syslog.conf.5;.  The default
 194         &man.syslog.conf.5; has been updated to include <filename
 195           class="directory">/etc/syslog.d</filename> and <filename
 196           class="directory">/usr/local/etc/syslog.d</filename> by
 197         default.</para>
 198
 199       <para revision="308914">The &man.zfsbootcfg.8; utility has been
 200         added, providing one-time &man.boot.config.5;-style options
 201         for &man.zfsboot.8;.</para>
 202
 203       <para revision="315514" contrib="sponsor" sponsor="&yandex;">The
 204         &man.setkey.8; utility has been modified to show the runtime
 205         <acronym>NAT-T</acronym> configuration.  The
 206         <literal>-g</literal> and <literal>-t</literal> flags have
 207         been added, which list only global and virtual policies,
 208         respectively, when used with the <literal>-D</literal> and
 209         <literal>-P</literal> flags.</para>
 210
 211       <para revision="316098" contrib="sponsor"
 212         sponsor="&dellemc;">The &man.getaddrinfo.1; utility has been
 213         added, ported from NetBSD.</para>
 214
 215       <para revision="316944" contrib="sponsor"
 216         sponsor="&multiplay;">The &man.jail.8; utility has been
 217         updated to allow explicitly-assigned <acronym>IPv4</acronym>
 218         and <acronym>IPv6</acronym> addresses to be used within
 219         a jail.</para>
 220
 221       <para revision="317855">The &man.daemon.8; utility has been
 222         updated to allow redirecting &man.stdout.4; and &man.stderr.4;
 223         output to &man.syslog.3; or to a file.</para>
 224     </sect2>
 225
 226     <sect2 xml:id="userland-contrib">
 227       <title>Contributed Software</title>
 228
 229       <para revision="307729">&man.unbound.8; has been updated to
 230         version 1.5.10.</para>
 231
 232       <para revision="309511"><application>Subversion</application>
 233         has been updated to version 1.9.5.</para>
 234
 235       <para revision="309847">&man.file.1; has been updated to version
 236         5.29.</para>
 237
 238       <para revision="310490">The &man.amd.8; utility has been updated
 239         to version 6.2.</para>
 240
 241       <para revision="312336">The <acronym>CLDR</acronym> locales have
 242         been updated to version 30.0.3.  The unicode locales have been
 243         updated to version 9.0.0.</para>
 244
 245       <para revision="312517">&man.xz.1; has been updated to version
 246         5.2.3.</para>
 247
 248       <para revision="313537">&man.tcpdump.1; has been updated to
 249         version 4.9.0.</para>
 250
 251       <para revision="313795">&man.zlib.3; has been updated to version
 252         1.2.11.</para>
 253
 254       <para revision="313980"><application>openresolv</application>
 255         has been updated to version 3.9.0.</para>
 256
 257       <para revision="313680">The NetBSD test suite has been updated
 258         to the 01.11.2017_23.20 snapshot.</para>
 259
 260       <para revision="314278"><literal>libucl</literal> has been
 261         updated to version 20170219.</para>
 262
 263       <para revision="315432">&man.libarchive.3; has been updated to
 264         version 3.3.1.</para>
 265
 266       <para revision="315995">&man.dma.8; has been updated to the
 267         2017-02-10 snapshot.</para>
 268
 269       <para revision="316068">&man.ntpd.8; has been updated to version
 270         4.2.8p10.</para>
 271
 272       <para revision="316303"><application>ACPICA</application> has
 273         been updated to version 20170303.</para>
 274
 275       <para revision="316349">Timezone data files have been updated to
 276         version 2017b.</para>
 277
 278       <para revision="316420">&man.mandoc.1; has been updated to
 279         version 1.14.</para>
 280
 281       <para revision="316423"><application>Clang</application> has
 282         been updated to version 4.0.0.</para>
 283
 284       <para revision="316423"><application>LLVM</application> has
 285         been updated to version 4.0.0.</para>
 286
 287       <para revision="316423"><application>LLD</application> has
 288         been updated to version 4.0.0.</para>
 289
 290       <para revision="316423"><application>LLDB</application> has
 291         been updated to version 4.0.0.</para>
 292
 293       <para revision="316423"><application>compiler-rt</application>
 294         has been updated to version 4.0.0.</para>
 295
 296       <para revision="316423"><application>libc++</application> has
 297         been updated to version 4.0.0.</para>
 298
 299       <para revision="316957">&man.tcsh.1; has been updated to version
 300         6.20.00.</para>
 301
 302       <para revision="318239" contrib="sponsor"
 303         sponsor="&ff;">&man.blacklistd.8; has been updated to the
 304         20170503 snapshot.</para>
 305
 306       <para revision="318402" contrib="sponsor"
 307         sponsor="&ff;">&man.blacklistd.8; support for
 308         <application>OpenSSH</application> has been refined to adjust
 309         notification points to catch all authentication failures
 310         rather than only those caused by invalid login
 311         usernames.</para>
 312     </sect2>
 313
 314     <sect2 xml:id="userland-installer">
 315       <title>Installation and Configuration Tools</title>
 316
 317       <para revision="311686">The &man.bsdinstall.8; installer has
 318         been updated to include support for hidden wireless networks
 319         when configuring the &man.wlan.4; interface.</para>
 320     </sect2>
 321
 322     <sect2 xml:id="userland-rc">
 323       <title><filename class="directory">/etc/rc.d</filename>
 324         Scripts</title>
 325
 326       <para revision="310009" contrib="sponsor"
 327         sponsor="&fisglobal;">The <literal>jail_confwarn</literal>
 328         &man.rc.conf.5; entry has been added, which suppresses warning
 329         about obsolete per-&man.jail.8; configurations.</para>
 330     </sect2>
 331
 332     <sect2 xml:id="userland-periodic">
 333       <title><filename class="directory">/etc/periodic</filename>
 334         Scripts</title>
 335
 336       <para revision="317373">The default &man.periodic.conf.5; has
 337         been updated to include the
 338         <literal>anticongestion_sleeptime</literal> option,
 339         consolidating random sleeps in &man.periodic.8; scripts and
 340         replacing the <literal>daily_ntpd_avoid_congestion</literal>
 341         option.  The default value is 3600 seconds.</para>
 342
 343       <para revision="317857">The <filename>410.status-mfi</filename>
 344         &man.periodic.8; script has been added to monitor the status
 345         of &man.mfi.4; volumes.</para>
 346     </sect2>
 347
 348     <sect2 xml:id="userland-libraries">
 349       <title>Runtime Libraries and API</title>
 350
 351       <para revision="316039">The &man.kvm.close.3; function has been
 352         updated to return the accumulated error from previous
 353         &man.close.2; calls.</para>
 354
 355       <para revision="317618" contrib="sponsor"
 356         sponsor="&dellemc;">The <function>clock_nanosleep()</function>
 357         system call has been added.  The
 358         <function>nanosleep()</function> system call is now a wrapper
 359         around <function>clock_nanosleep()</function>.</para>
 360     </sect2>
 361
 362     <sect2 xml:id="userland-abi">
 363       <title>ABI Compatibility</title>
 364
 365       <para revision="309258">The type <literal>max_align_t</literal>
 366         is now defined for C11 compliance.</para>
 367
 368       <para revision="315274" contrib="sponsor"
 369         sponsor="&dellemc;">The
 370         <function>sem_clockwait_np()</function> library function has
 371         been added, which allows the caller to specify the reference
 372         clock and choose between absolute and relative mode.</para>
 373
 374       <para revision="315282">The <application>clang</application>
 375         <literal>nullability</literal> attribute has been added to the
 376         <literal>C</literal> library headers.</para>
 377     </sect2>
 378   </sect1>
 379
 380   <sect1 xml:id="kernel">
 381     <title>Kernel</title>
 382
 383     <para>This section covers changes to kernel configurations, system
 384       tuning, and system control parameters that are not otherwise
 385       categorized.</para>
 386
 387     <sect2 xml:id="kernel-bugfix">
 388       <title>Kernel Bug Fixes</title>
 389
 390       <para revision="317434">The &man.ipf.4; packet filter has been
 391         updated to prevent <literal>keep state</literal> from
 392         incorrectly implying <literal>keep frags</literal>, matching
 393         the behavior documented in &man.ipf.5;.</para>
 394     </sect2>
 395
 396     <sect2 xml:id="kernel-config">
 397       <title>Kernel Configuration</title>
 398
 399       <para revision="315514" contrib="sponsor" sponsor="&yandex;">The
 400         <literal>IPSEC_NAT_T</literal> kernel configuration option has
 401         been removed.  Support for <acronym>NAT-T</acronym> is now
 402         enabled by default.</para>
 403
 404       <para revision="315514" contrib="sponsor" sponsor="&yandex;">The
 405         <literal>IPSEC_FILTERTUNNEL</literal> kernel option has been
 406         removed, which was deprecated by the
 407         <literal>net.inet.ipsec.filtertunnel</literal> sysctl.</para>
 408     </sect2>
 409
 410     <sect2 xml:id="kernel-modules">
 411       <title>Kernel Modules</title>
 412
 413       <para revision="307144">&man.cloudabi.4; has been updated to
 414         allow running 32-bit binaries within 64-bit userland
 415         environments when the kernel configuration file has the
 416         <literal>COMPAT_CLOUDABI32</literal> option present.</para>
 417
 418       <para revision="315514" contrib="sponsor" sponsor="&yandex;">The
 419         <literal>ipsec</literal> and <literal>tcpmd5</literal> kernel
 420         modules have been added.</para>
 421
 422       <para revision="316274" contrib="sponsor" sponsor="&yandex;">The
 423         &man.ipfw.4; packet filter has been updated to add support for
 424         named dynamic states.</para>
 425
 426       <para revision="316444" contrib="sponsor" sponsor="&yandex;">The
 427         <literal>ipfw_nptv6</literal> kernel module has been added,
 428         implementing Network Prefix Translation for
 429         <acronym>IPv6</acronym> as defined in <acronym>RFC</acronym>
 430         6296.</para>
 431
 432       <para revision="316446" contrib="sponsor" sponsor="&yandex;">The
 433         <literal>ipfw_nat64</literal> kernel module has been added,
 434         implementing stateless and stateful
 435         <acronym>NAT64</acronym>.</para>
 436
 437       <para revision="316660" contrib="sponsor" sponsor="&ff;">The
 438         &man.cfumass.4; device has been added, providing a storage
 439         frontend to <acronym>USB</acronym>
 440         <acronym>OTG</acronym>-capable hardware.</para>
 441
 442       <para revision="317045" contrib="sponsor" sponsor="&yandex;">The
 443         <literal>ipfw_pmod</literal> kernel module has been added,
 444         designed for modifying packets of any protocol.</para>
 445
 446       <note>
 447         <para>At present, only <acronym>TCP</acronym>
 448           <acronym>MSS</acronym> modification is implemented.</para>
 449       </note>
 450     </sect2>
 451
 452     <sect2 xml:id="kernel-sysctl">
 453       <title>System Tuning and Controls</title>
 454
 455       <para revision="315539">The
 456         <literal>vfs.root_mount_always_wait</literal> tunable has been
 457         added, which forces the kernel to wait for root mount holds
 458         even if the root device is already present.</para>
 459
 460       <para revision="316120" contrib="sponsor"
 461         sponsor="&dellemc;">When the system real time clock
 462         (<acronym>RTC</acronym>) is adjusted, such as by
 463         <function>clock_settime()</function>, sleeping threads are now
 464         awakened and absolute sleep times are reevaluated based on the
 465         new value of the RTC.</para>
 466     </sect2>
 467   </sect1>
 468
 469   <sect1 xml:id="drivers">
 470     <title>Devices and Drivers</title>
 471
 472     <para>This section covers changes and additions to devices and
 473       device drivers since &release.prev;.</para>
 474
 475     <sect2 xml:id="drivers-device">
 476       <title>Device Drivers</title>
 477
 478       <para revision="307768">The &man.jedec.ts.4; driver has been
 479         added, providing support for thermal sensors on memory
 480         modules.  The driver currently supports chips that are fully
 481         compliant with the <acronym>JEDEC</acronym>
 482         <acronym>JC</acronym> 42.4 specification.</para>
 483
 484       <para revision="308104">The &man.chromebook.platform.4; driver
 485         has been added, providing support for various Chromebook
 486         models.</para>
 487
 488       <para revision="308942">The &man.bytgpio.4; driver has been
 489         added, providing support for Intel&reg; Bay&nbsp;Trail&trade;
 490         SoC GPIO controllers.</para>
 491     </sect2>
 492
 493     <sect2 xml:id="drivers-storage">
 494       <title>Storage Drivers</title>
 495
 496       <para>&nbsp;</para>
 497     </sect2>
 498
 499     <sect2 xml:id="drivers-network">
 500       <title>Network Drivers</title>
 501
 502       <para revision="309377" contrib="sponsor"
 503         sponsor="&broadcom;">The &man.bnxt.4; driver has been added,
 504         providing support for Broadcom&reg; NetXtreme-C&trade; and
 505         NetXtreme-E&trade; devices.</para>
 506
 507       <para revision="310852" contrib="sponsor"
 508         sponsor="&netgate;">The &man.miibus.4; driver has been updated
 509         to support Microchip/Micrel KSZ9031 Gigabit ethernet
 510         cards.</para>
 511
 512       <para revision="311506" contrib="sponsor"
 513         sponsor="&chelsio;">The &man.cxgbe.4; driver has been updated
 514         to firmware version 1.16.26.0 for T4, T5, and T6 cards.</para>
 515
 516       <para revision="312358">The &man.alc.4; driver has been updated
 517         to provide support for Atheros&reg; Killer&nbsp;E2400&trade;
 518         Gigabit ethernet cards.</para>
 519
 520       <para revision="314005" contrib="sponsor" sponsor="&ms;">The
 521         &man.alc.4; driver has been updated to provide support for
 522         Atheros&reg; Killer&nbsp;E2500&trade; Gigabit ethernet
 523         cards.</para>
 524
 525       <para revision="315330" contrib="sponsor"
 526         sponsor="&netgate;">The &man.etherswitch.4; driver has been
 527         updated to support RTL8366RB and RTL8366SR cards.</para>
 528
 529       <para revision="317116">The &man.qlnxe.4; driver has been added,
 530         providing support for Cavium&reg; Qlogic&trade; 45000 Series
 531         adapters.</para>
 532
 533       <para revision="317182">The &man.qlxgbe.4; firmware has been
 534         updated to version 5.4.64.</para>
 535
 536       <para revision="318357" contrib="sponsor"
 537         sponsor="&intelcorp;">The &man.ixl.4; driver has been updated
 538         to version 1.7.12-k.</para>
 539     </sect2>
 540   </sect1>
 541
 542   <sect1 xml:id="hardware">
 543     <title>Hardware Support</title>
 544
 545     <para>This section covers general hardware support for physical
 546       machines, hypervisors, and virtualization environments, as well
 547       as hardware changes and updates that do not otherwise fit in
 548       other sections of this document.</para>
 549
 550     <sect2 xml:id="hardware-support">
 551       <title>Hardware Support</title>
 552
 553       <para revision="307576">The &man.atkbdc.4; driver has been
 554         updated to provide support for Elantech&reg; trackpads.  To
 555         enable hardware support, add
 556         <literal>hw.psm.elantech_support=1</literal> to
 557         &man.loader.conf.5;.</para>
 558     </sect2>
 559
 560     <sect2 xml:id="hardware-virtualization">
 561       <title>Virtualization Support</title>
 562
 563       <para>&nbsp;</para>
 564     </sect2>
 565
 566     <sect2 xml:id="hardware-arm">
 567       <title>ARM Support</title>
 568
 569       <para revision="305436">Support for the Allwinner A13 board has
 570         been added.</para>
 571     </sect2>
 572   </sect1>
 573
 574   <sect1 xml:id="storage">
 575     <title>Storage</title>
 576
 577     <para>This section covers changes and additions to file systems
 578       and other storage subsystems, both local and networked.</para>
 579
 580     <sect2 xml:id="storage-general">
 581       <title>General Storage</title>
 582
 583       <para>&nbsp;</para>
 584     </sect2>
 585
 586     <sect2 xml:id="storage-net">
 587       <title>Networked Storage</title>
 588
 589       <para>&nbsp;</para>
 590     </sect2>
 591
 592     <sect2 xml:id="storage-zfs">
 593       <title>ZFS</title>
 594
 595       <para>&nbsp;</para>
 596     </sect2>
 597
 598     <sect2 xml:id="storage-geom">
 599       <title><literal>geom(4)</literal></title>
 600
 601       <para>&nbsp;</para>
 602     </sect2>
 603   </sect1>
 604
 605   <sect1 xml:id="boot">
 606     <title>Boot Loader Changes</title>
 607
 608     <para>This section covers the boot loader, boot menu, and other
 609       boot-related changes.</para>
 610
 611     <sect2 xml:id="boot-loader">
 612       <title>Boot Loader Changes</title>
 613
 614       <para revision="307632" contrib="sponsor" sponsor="&gandi;">The
 615         <acronym>EFI</acronym> loader has been updated to support
 616         <acronym>TFTPFS</acronym>, providing netboot support without
 617         requiring an <acronym>NFS</acronym> server.</para>
 618     </sect2>
 619
 620     <sect2 xml:id="boot-menu">
 621       <title>Boot Menu Changes</title>
 622
 623       <para>&nbsp;</para>
 624     </sect2>
 625   </sect1>
 626
 627   <sect1 xml:id="network">
 628     <title>Networking</title>
 629
 630     <para>This section describes changes that affect networking in
 631       &os;.</para>
 632
 633     <sect2 xml:id="network-general">
 634       <title>General Network Changes</title>
 635
 636       <para revision="311681" contrib="sponsor" sponsor="&yandex;">The
 637         network stack has been updated to include
 638         <function>ip6_tryforward()</function>, providing performance
 639         benefits as result of a reduced number of checks.</para>
 640
 641       <para revision="313523" contrib="sponsor"
 642         sponsor="&dellemc;">The network stack has been modified to fix
 643         incorrect or invalid <acronym>IP</acronym> addresses if
 644         multiple threads emit a <acronym>UDP</acronym>
 645         <literal>log_in_vain</literal> message concurrently.</para>
 646
 647       <para revision="317386" contrib="sponsor"
 648         sponsor="&multiplay;">The <acronym>TCP</acronym> stack has
 649         been changed to use the estimated <acronym>RTT</acronym>
 650         instead of timestamps for receive buffer auto resizing.</para>
 651     </sect2>
 652
 653     <sect2 xml:id="network-protocols">
 654       <title>Network Protocols</title>
 655
 656       <para revision="309337" contrib="sponsor"
 657         sponsor="&dellemc;">Support for <acronym>GARP</acronym>
 658         retransmit has been added.  A new &man.sysctl.8;,
 659         <literal>net.link.ether.inet.garp_rexmit_count</literal>, has
 660         been added, which sets the maximum number of retransmissions
 661         when set to a non-zero value.</para>
 662
 663       <para revision="315514" contrib="sponsor"
 664         sponsor="&yandex;">Support for the
 665         <literal>UDP_ENCAP_ESPINUDP_NON_IKE</literal> encapsulation
 666         type has been removed.</para>
 667     </sect2>
 668   </sect1>
 669
 670   <sect1 xml:id="ports">
 671     <title>Ports Collection and Package Infrastructure</title>
 672
 673     <para>This section covers changes to the &os;&nbsp;Ports
 674       Collection, package infrastructure, and package maintenance and
 675       installation tools.</para>
 676
 677     <sect2 xml:id="ports-infrastructure">
 678       <title>Infrastructure Changes</title>
 679
 680       <para>&nbsp;</para>
 681     </sect2>
 682
 683     <sect2 xml:id="ports-packages ">
 684       <title>Packaging Changes</title>
 685
 686       <para>&nbsp;</para>
 687     </sect2>
 688   </sect1>
 689
 690   <sect1 xml:id="doc">
 691     <title>Documentation</title>
 692
 693     <para>This section covers changes to the &os;&nbsp;Documentation
 694       Project sources and toolchain.</para>
 695
 696     <sect2 xml:id="doc-sources">
 697       <title>Documentation Source Changes</title>
 698
 699       <para>&nbsp;</para>
 700     </sect2>
 701
 702     <sect2 xml:id="doc-toolchain">
 703       <title>Documentation Toolchain Changes</title>
 704
 705       <para>&nbsp;</para>
 706     </sect2>
 707   </sect1>
 708
 709   <sect1 xml:id="releng">
 710     <title>Release Engineering and Integration</title>
 711
 712     <para>This section convers changes that are specific to the
 713       &os;&nbsp;Release Engineering processes.</para>
 714
 715     <sect2 xml:id="releng-changes">
 716       <title>Integration Changes</title>
 717
 718       <para>&nbsp;</para>
 719     </sect2>
 720   </sect1>
 721 </article>