Date: Wed, 12 Aug 2015 22:51:09 +0000 (UTC) From: Sean Bruno <sbruno@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r286706 - stable/10/share/man/man4 Message-ID: <201508122251.t7CMp9KB080611@repo.freebsd.org>
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Author: sbruno Date: Wed Aug 12 22:51:08 2015 New Revision: 286706 URL: https://svnweb.freebsd.org/changeset/base/286706 Log: MFC r273081 brueffer: New sentence -> new line; use macros where appropriate. MFC r276345 Mikhail <mp@lenta.ru Correct naming of sysctl pmtud_blackhole_activated_min_mss. Clarify some statements around PMTUD blackhole detection to make the behavior more clear in the man page. Modified: stable/10/share/man/man4/tcp.4 Directory Properties: stable/10/ (props changed) Modified: stable/10/share/man/man4/tcp.4 ============================================================================== --- stable/10/share/man/man4/tcp.4 Wed Aug 12 22:41:06 2015 (r286705) +++ stable/10/share/man/man4/tcp.4 Wed Aug 12 22:51:08 2015 (r286706) @@ -520,23 +520,31 @@ ECN allows a TCP sender to reduce the tr avoid packet drops. .It Va ecn.maxretries Number of retries (SYN or SYN/ACK retransmits) before disabling ECN on a -specific connection. This is needed to help with connection establishment +specific connection. +This is needed to help with connection establishment when a broken firewall is in the network path. .It Va pmtud_blackhole_detection -Turn on automatic path MTU blackhole detection. In case of retransmits we will -lower the MSS to check if it's MTU problem. If current MSS is greater than -configured value to try, it will be set to it, otherwise, MSS will be set to -default values (net.inet.tcp.mssdflt and net.inet.tcp.v6mssdflt). +Turn on automatic path MTU blackhole detection. +In case of retransmits OS will +lower the MSS to check if it's MTU problem. +If current MSS is greater than +configured value to try, it will be set to configured value, otherwise, +MSS will be set to default values +.Po Va net.inet.tcp.mssdflt +and +.Va net.inet.tcp.v6mssdflt +.Pc . .It Va pmtud_blackhole_mss MSS to try for IPv4 if PMTU blackhole detection is turned on. .It Va v6pmtud_blackhole_mss MSS to try for IPv6 if PMTU blackhole detection is turned on. .It Va pmtud_blackhole_activated -Number of times the code was activated to attempt a MSS downshift. -.It Va pmtud_blackhole_min_activated -Number of times the blackhole MSS was used in an attempt to downshift. +Number of times configured values were used in an attempt to downshift. +.It Va pmtud_blackhole_activated_min_mss +Number of times default MSS was used in an attempt to downshift. .It Va pmtud_blackhole_failed -Number of times that we failed to connect after we downshifted the MSS. +Number of connections for which retransmits continued even after MSS +downshift. .El .Sh ERRORS A socket operation may fail with one of the following errors returned:
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