From owner-freebsd-current@FreeBSD.ORG Wed Oct 29 04:41:58 2003 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 80E6316A4CE for ; Wed, 29 Oct 2003 04:41:58 -0800 (PST) Received: from srv1.cosmo-project.de (srv1.cosmo-project.de [213.83.6.106]) by mx1.FreeBSD.org (Postfix) with ESMTP id B1B4F43FBF for ; Wed, 29 Oct 2003 04:41:52 -0800 (PST) (envelope-from ticso@cicely12.cicely.de) Received: from cicely5.cicely.de (cicely5.cicely.de [IPv6:3ffe:400:8d0:301:200:92ff:fe9b:20e7]) (authenticated bits=0) h9TCfjt2025167 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=OK); Wed, 29 Oct 2003 13:41:49 +0100 (CET) (envelope-from ticso@cicely12.cicely.de) Received: from cicely12.cicely.de (cicely12.cicely.de [IPv6:3ffe:400:8d0:301::12]) by cicely5.cicely.de (8.12.10/8.12.10) with ESMTP id h9TCRrS8006399 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 29 Oct 2003 13:27:54 +0100 (CET) (envelope-from ticso@cicely12.cicely.de) Received: from cicely12.cicely.de (localhost [127.0.0.1]) by cicely12.cicely.de (8.12.10/8.12.10) with ESMTP id h9TCRr2u011489; Wed, 29 Oct 2003 13:27:53 +0100 (CET) (envelope-from ticso@cicely12.cicely.de) Received: (from ticso@localhost) by cicely12.cicely.de (8.12.10/8.12.10/Submit) id h9TCRl8I011488; Wed, 29 Oct 2003 13:27:47 +0100 (CET) (envelope-from ticso) Date: Wed, 29 Oct 2003 13:27:47 +0100 From: Bernd Walter To: Christian Weisgerber Message-ID: <20031029122746.GE4100@cicely12.cicely.de> References: <20031028063802.GC10818@canolog.ninthwonder.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Operating-System: FreeBSD cicely12.cicely.de 5.1-CURRENT alpha User-Agent: Mutt/1.5.4i cc: freebsd-current@freebsd.org Subject: Re: Forward: HEADS UP! Default value of ip6_v6only changed X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: ticso@cicely.de List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 29 Oct 2003 12:41:58 -0000 On Tue, Oct 28, 2003 at 11:51:59PM +0000, Christian Weisgerber wrote: > Hajimu UMEMOTO wrote: > > > Our default of net.inet6.ip6.v6only was off in 4.X, and was changed to > > on on 5.X to follow NetBSD's practice. This behavior on 5.X breaks > > RFC2553/3493, and the change was intentional from security > > consideration. But, NetBSD changed it off by default. > > OpenBSD's behavior is equivalent to v6only on, and OpenBSD doesn't > even provide a knob. > > Note that the default choice has a major impact on 3rd party software > (ports). If we ship with a default of v6only off, then people will > not fix software to open two sockets. This in turn means that > turning v6only on will break this software. I predict that a good > many people will then consider the v6only option to be useless. I can second this. The first time I noticed this mistake in self written software was when I tested it on NetBSD, where the default was already to v6only while FreeBSD still had it off. -- B.Walter BWCT http://www.bwct.de ticso@bwct.de info@bwct.de