From owner-freebsd-bugs@freebsd.org Wed Feb 10 20:51:24 2016 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id CCD78AA43DE for ; Wed, 10 Feb 2016 20:51:24 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (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 BF23ACE0 for ; Wed, 10 Feb 2016 20:51:24 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id u1AKpNKw028138 for ; Wed, 10 Feb 2016 20:51:24 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 207087] kernel: r295285 in 10.2-STABLE breaks OpenVPN functionality Date: Wed, 10 Feb 2016 20:51:24 +0000 X-Bugzilla-Reason: AssignedTo CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 10.2-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: mgrooms@shrew.net X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Feb 2016 20:51:24 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D207087 --- Comment #5 from mgrooms@shrew.net --- I see. They underlying cause is quite possibly unrelated then. As I said, I wasn't trying to hijack your bug report. But the symptom still sounds simil= ar in the respect that some of your UDP traffic ( your OpenVPN control traffic= for example ) appears to be processed correctly, but other traffic ( your OpenV= PN transport traffic being tunneled ) does not. That smacks of a re-assembly problem. In the latter case, you could have a large inner IP packet size du= e to the tunnel overhead which would cause the outer IP packet to be fragmented. This would lead to stalls and resets from the client perspective, just as y= ou describe in your bug report. However, that doesn't necessarily explain your 2nd problem where non-tunnel= ed traffic stalls. You can't NAT fragmented packets if you have a re-assembly problem as the required UDP/TCP port values are only available in the initi= al packet of a fragmented chain. That usually only effects UDP packets but it = can still be a problem for TCP if the TCP MSS is large enough as the DNF bit is typically set in the IP header. In any case, good luck with your problem. --=20 You are receiving this mail because: You are the assignee for the bug. You are on the CC list for the bug.=