svn commit: r285899 - releng/10.2/release/doc/en_US.ISO8859-1/relnotes
Glen Barber
gjb at FreeBSD.org
Sun Jul 26 19:47:40 UTC 2015
Author: gjb
Date: Sun Jul 26 19:47:38 2015
New Revision: 285899
URL: https://svnweb.freebsd.org/changeset/base/285899
Log:
Document r273838, PLPMTUD blackhole detection (RFC 4821).
Submitted by: sbruno
Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation
Modified:
releng/10.2/release/doc/en_US.ISO8859-1/relnotes/article.xml
Modified: releng/10.2/release/doc/en_US.ISO8859-1/relnotes/article.xml
==============================================================================
--- releng/10.2/release/doc/en_US.ISO8859-1/relnotes/article.xml Sun Jul 26 19:47:08 2015 (r285898)
+++ releng/10.2/release/doc/en_US.ISO8859-1/relnotes/article.xml Sun Jul 26 19:47:38 2015 (r285899)
@@ -730,7 +730,80 @@
<sect2 xml:id="network-protocols">
<title>Network Procols</title>
- <para> </para>
+ <para revision="273838" contrib="sponsor"
+ sponsor="&limelight;">Support for <acronym>PLPMTUD</acronym>
+ blackhole detection (<acronym>RFC</acronym> 4821) has been
+ added to the &man.tcp.4; stack, disabled by default. New
+ control tunables have been added:</para>
+
+ <informaltable frame="none" pgwide="0">
+ <tgroup cols="2">
+ <colspec colwidth="1*"/>
+ <colspec colwidth="1*"/>
+ <thead>
+ <row>
+ <entry>Tunable</entry>
+ <entry>Description</entry>
+ </row>
+ </thead>
+
+ <tbody>
+ <row>
+ <entry><literal>net.inet.tcp.pmtud_blackhole_detection</literal></entry>
+ <entry>Enables or disables <acronym>PLPMTUD</acronym>
+ blackhole detection</entry>
+ </row>
+
+ <row>
+ <entry><literal>net.inet.tcp.pmtud_blackhole_mss</literal></entry>
+ <entry><acronym>MSS</acronym> to try for IPv4</entry>
+ </row>
+
+ <row>
+ <entry><literal>net.inet.tcp.v6pmtud_blackhole_mss</literal></entry>
+ <entry><acronym>MSS to try for IPv6</acronym></entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </informaltable>
+
+ <para>New monitoring &man.sysctl.8;s haven been added:</para>
+
+ <informaltable frame="none" pgwide="0">
+ <tgroup cols="2">
+ <colspec colwidth="1*"/>
+ <colspec colwidth="1*"/>
+ <thead>
+ <row>
+ <entry>Tunable</entry>
+ <entry>Description</entry>
+ </row>
+ </thead>
+
+ <tbody>
+ <row>
+ <entry><literal>net.inet.tcp.pmtud_blackhole_activated</literal></entry>
+ <entry>Number of times the code was activated to attempt
+ downshifting the <acronym>MSS</acronym></entry>
+ </row>
+
+ <row>
+ <entry><literal>net.inet.tcp.pmtud_blackhole_min_activated</literal></entry>
+ <entry>Number of times the blackhole
+ <acronym>MSS</acronym> was used in an attempt to
+ downshift</entry>
+ </row>
+
+ <row>
+ <entry><literal>net.inet.tcp.pmtud_blackhole_failed</literal></entry>
+ <entry>Number of times that the blackhole failed to
+ connect after downshifting the
+ <acronym>MSS</acronym></entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </informaltable>
+
</sect2>
</sect1>
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