Date: Wed, 29 Oct 2003 13:27:47 +0100 From: Bernd Walter <ticso@cicely12.cicely.de> To: Christian Weisgerber <naddy@mips.inka.de> Cc: freebsd-current@freebsd.org Subject: Re: Forward: HEADS UP! Default value of ip6_v6only changed Message-ID: <20031029122746.GE4100@cicely12.cicely.de> In-Reply-To: <bnmvev$2mqh$1@kemoauc.mips.inka.de> References: <20031028063802.GC10818@canolog.ninthwonder.com> <yge65i94i7t.wl%ume@mahoroba.org> <bnmvev$2mqh$1@kemoauc.mips.inka.de>
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On Tue, Oct 28, 2003 at 11:51:59PM +0000, Christian Weisgerber wrote: > Hajimu UMEMOTO <ume@mahoroba.org> 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
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