Date: Wed, 27 Aug 2014 11:59:25 +0000 From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Jonathan Price <freebsd@jonathanprice.org> Cc: FreeBSD Net <freebsd-net@freebsd.org>, Hiroki Sato <hrs@FreeBSD.org> Subject: Re: Should I be using ipv6_activate_all_interfaces or ip6addrctl_policy="ipv6_prefer" Message-ID: <2D16BCE4-5E5A-4C06-8927-76953DDEC348@lists.zabbadoz.net> In-Reply-To: <53FD7B34.1050408@jonathanprice.org> References: <88a42e1006e3fac7508a9419e342f1b2@mail.jonathanprice.org> <2173103.SJdXL7NPLT@overcee.wemm.org> <53FD7B34.1050408@jonathanprice.org>
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On 27 Aug 2014, at 06:31 , Jonathan Price <freebsd@jonathanprice.org> wrote: > On 2014-08-27 01:40, Peter Wemm wrote: >> On Tuesday 26 August 2014 10:40:27 freebsd@jonathanprice.org wrote: >>> Hello, >>> >>> I am configuring a server with IPv4 and IPv6 addresses and have noticed that >>> FreeBSD seems to be preferring IPv4, such as when establishing SSH >>> connections. >>> >>> After reading through /etc/defaults/rc.conf, and later /etc/rc.d/ip6addrctl >>> I have come to the conclusion that I have two ways to tell FreeBSD to >>> prefer IPv6: >>> >>> 1) Add ipv6_activate_all_interfaces to /etc/rc.conf >>> 2) Add ip6addrctl_policy="ipv6_prefer" to /etc/rc.conf >>> >>> Could anybody with a little more knowledge on the matter explain to me which >>> of the two options is more preferential? >> >> They both do different things. >> >> The activate knob is to enable ipv6 on an interface. To oversimplify it, if >> you configure an address on an interface, it is "enabled". However, this >> switch enables this on all the rest of the interfaces, even the ones you >> didn't configure. >> >> ip6addrctl* affects things like hostname lookups to sort the addresses returned >> to the caller. >> >> They are different things entirely. I think you are expecting the behavior >> that ip6_prefer policy gives you. That's what we use in the freebsd.org >> cluster to have it use ipv6 where possible. >> > > Hi, and thanks for the response. > > Would it be possible to go into a little detail as to what ipv6_activate_all_interfaces="YES" does to interfaces which don't explicitly have an address configured? I can’t appear to find much information on this option. man rc.conf has a description (which I should probably read myself;-) in case that gets you a bit further. I think it’s a “backward compat helper” to the old ipv6_enable=“YES” switch which existed before we could enable IPv6 on a per-interface base. > However, it does sound like for my purposes it would make more sense to use ip6addrctl_policy=“ipv6_prefer" as that is more explicitly the feature I want, rather than getting it inadvertently through the other knob. Yes. Definitively. I am not sure if it has happened but if IPv6 config is configured through rc.conf that setting should be(come) default. Bjoern — Bjoern A. Zeeb "Come on. Learn, goddamn it.", WarGames, 1983
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