From owner-svn-src-all@FreeBSD.ORG Mon Oct 13 21:04:15 2014 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 0DB70A32; Mon, 13 Oct 2014 21:04:15 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id EE211ED6; Mon, 13 Oct 2014 21:04:14 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.9/8.14.9) with ESMTP id s9DL4E6G068975; Mon, 13 Oct 2014 21:04:14 GMT (envelope-from sbruno@FreeBSD.org) Received: (from sbruno@localhost) by svn.freebsd.org (8.14.9/8.14.9/Submit) id s9DL4EZB068974; Mon, 13 Oct 2014 21:04:14 GMT (envelope-from sbruno@FreeBSD.org) Message-Id: <201410132104.s9DL4EZB068974@svn.freebsd.org> X-Authentication-Warning: svn.freebsd.org: sbruno set sender to sbruno@FreeBSD.org using -f From: Sean Bruno Date: Mon, 13 Oct 2014 21:04:14 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r273061 - head/share/man/man4 X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 13 Oct 2014 21:04:15 -0000 Author: sbruno Date: Mon Oct 13 21:04:14 2014 New Revision: 273061 URL: https://svnweb.freebsd.org/changeset/base/273061 Log: Update tcp(4) with plpmtud blackhole sysctls Submitted by: Mikhail MFC after: 2 weeks Relnotes: yes Modified: head/share/man/man4/tcp.4 Modified: head/share/man/man4/tcp.4 ============================================================================== --- head/share/man/man4/tcp.4 Mon Oct 13 20:39:51 2014 (r273060) +++ head/share/man/man4/tcp.4 Mon Oct 13 21:04:14 2014 (r273061) @@ -518,6 +518,21 @@ avoid packet drops. Number of retries (SYN or SYN/ACK retransmits) before disabling ECN on a 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). +.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. +.It Va pmtud_blackhole_failed +Number of times that we failed to connect after we downshifted the MSS. .El .Sh ERRORS A socket operation may fail with one of the following errors returned: