Date: Sun, 26 Jul 2015 19:47:39 +0000 (UTC) From: Glen Barber <gjb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-releng@freebsd.org Subject: svn commit: r285899 - releng/10.2/release/doc/en_US.ISO8859-1/relnotes Message-ID: <201507261947.t6QJldJU032551@repo.freebsd.org>
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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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