Date: Fri, 29 Aug 2014 11:25:50 -0700 From: Peter Wemm <peter@wemm.org> To: freebsd-net@freebsd.org Cc: bzeeb-lists@lists.zabbadoz.net, Hiroki Sato <hrs@freebsd.org>, freebsd@jonathanprice.org Subject: Re: Should I be using ipv6_activate_all_interfaces or ip6addrctl_policy="ipv6_prefer" Message-ID: <1826701.PSDCF000lT@overcee.wemm.org> In-Reply-To: <20140830.004156.1902600650619729089.hrs@allbsd.org> References: <53FD7B34.1050408@jonathanprice.org> <20140829101707.GA83695@zibbi.meraka.csir.co.za> <20140830.004156.1902600650619729089.hrs@allbsd.org>
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[-- Attachment #1 --] On Saturday 30 August 2014 00:41:56 Hiroki Sato wrote: > John Hay <jhay@meraka.org.za> wrote > in <20140829101707.GA83695@zibbi.meraka.csir.co.za>: > > jh> On Wed, Aug 27, 2014 at 11:59:25AM +0000, Bjoern A. Zeeb wrote: > jh> > > jh> > On 27 Aug 2014, at 06:31 , Jonathan Price <freebsd@jonathanprice.org> > jh> > wrote: > jh> > > jh> > > On 2014-08-27 01:40, Peter Wemm wrote: > jh> > >> On Tuesday 26 August 2014 10:40:27 freebsd@jonathanprice.org wrote: > jh> > >>> Hello, > jh> > >>> > jh> > >>> I am configuring a server with IPv4 and IPv6 addresses and have > jh> > >>> noticed that > jh> > >>> FreeBSD seems to be preferring IPv4, such as when establishing SSH > jh> > >>> connections. > jh> > >>> > jh> > >>> After reading through /etc/defaults/rc.conf, and later > jh> > >>> /etc/rc.d/ip6addrctl > jh> > >>> I have come to the conclusion that I have two ways to tell FreeBSD > to jh> > >>> prefer IPv6: > jh> > >>> > jh> > >>> 1) Add ipv6_activate_all_interfaces to /etc/rc.conf > jh> > >>> 2) Add ip6addrctl_policy="ipv6_prefer" to /etc/rc.conf > jh> > >>> > jh> ... > jh> > > However, it does sound like for my purposes it would make more sense > jh> > > to use ip6addrctl_policy=?ipv6_prefer" as that is more explicitly > the jh> > > feature I want, rather than getting it inadvertently through > the other jh> > > knob. > jh> > > jh> > Yes. Definitively. I am not sure if it has happened but if IPv6 > jh> > config is configured through rc.conf that setting should be(come) > jh> > default. > jh> > > jh> > jh> It does not seem so yet (anymore, it was like that many moons ago). A > jh> new > > ... > > jh> I think if an IPv6 address is configured on a machine, it should > jh> prefer ipv6 > jh> addresses. That would match what the rest are doing. > > True at this moment. I have a patch to make it set ipv6_prefer when > at least one ifconfig_IF_ipv6 is configured. > > Is there any objection to commit this? I had hesitated to add this > for a technical reason which was eliminated by adding list_vars(). > > -- Hiroki I understand the hesitation. There has long been a problem of people only half configuring ipv6, or enabling it without having connectivity. Or people listing AAAA records without being reachable. However, we have run the freebsd.org cluster with prefer_ipv6 for two years now (likewise, I've done the same at home) and no insurmountable issues have occurred. There are enough people pushing ipv6 and using it on a daily basis now that the old half-configured problems are fairly quickly noticed. I think we could turn it on by default now, as your patch does. And it will still be able to be disabled. -- Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com; KI6FJV UTF-8: for when a ' or ... just won\342\200\231t do\342\200\246 [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAABAgAGBQJUAMWyAAoJEDXWlwnsgJ4E+e8H/i9fDuI6JmjvyCOO2W4FHAe2 /2kspw2POsDHB6azRwogiQIBe63TX+ELEEwn3r8fzV+nqBhY5D7EUyeVBNpqoCaF XP6nMW60mJVEUQAYvge/h3eT8gU6iL+gppgdz+fVA0oTqsyGZ6uTtDOYGpitYPsW 68JxJZ4z56i8BSfMWmEtTeN4014M4yUw8SbMDG8/pGz0CCJepbTYbRgQJ6N4ji1R 43HzuH0gCd0aPRBMRN/xOdBuvJdvAK9ynUpr8UDyCEVsHY1NR08aKwnR5v4ais9L mGnxX2tl9aTGL+JYOVDDhOzcgRKSdSBDwXbIqQF4pYJK2fO9noNAVT2OEcY3o/s= =IUDd -----END PGP SIGNATURE-----
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