From owner-freebsd-net@freebsd.org  Thu Mar 30 20:46:41 2017
Return-Path: <owner-freebsd-net@freebsd.org>
Delivered-To: freebsd-net@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 9F1AED26549
 for <freebsd-net@mailman.ysv.freebsd.org>;
 Thu, 30 Mar 2017 20:46:41 +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 8EEC2AE2
 for <freebsd-net@FreeBSD.org>; Thu, 30 Mar 2017 20:46:41 +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 v2UKkfwK087106
 for <freebsd-net@FreeBSD.org>; Thu, 30 Mar 2017 20:46:41 GMT
 (envelope-from bugzilla-noreply@freebsd.org)
From: bugzilla-noreply@freebsd.org
To: freebsd-net@FreeBSD.org
Subject: [Bug 173444] [socket] [patch] IPV6_USE_MIN_MTU and TCP is broken
Date: Thu, 30 Mar 2017 20:46:41 +0000
X-Bugzilla-Reason: AssignedTo
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: 8.3-STABLE
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: Affects Only Me
X-Bugzilla-Who: marka@isc.org
X-Bugzilla-Status: In Progress
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: Normal
X-Bugzilla-Assigned-To: freebsd-net@FreeBSD.org
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-173444-2472-wMqYb9DlYe@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-173444-2472@https.bugs.freebsd.org/bugzilla/>
References: <bug-173444-2472@https.bugs.freebsd.org/bugzilla/>
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-net@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net/>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 30 Mar 2017 20:46:41 -0000

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D173444

--- Comment #10 from marka@isc.org ---
(In reply to Andrey V. Elsukov from comment #8)
So what!  Most DNS/TCP response is a few of packets.  What does it
matter if it is the 3 or 4 packets.

What matters is avoiding PMTUD as it is NOT reliable.  Setting the
IPv6 packet size to 1280 avoids triggering PMTUD issues.  Limiting
the packet size avoids timeout and retransmissions due to PTB not
been generated due to rate limiting or being lost due to stupid
load balancers and firewalls that drop ICMP.

Go put your validating resolvers behind a IPv6 in IPv4 link then
come back and say this is not needed.

--=20
You are receiving this mail because:
You are the assignee for the bug.=