Date: Mon, 12 Dec 2011 19:58:30 +0100 From: Ulrich =?utf-8?B?U3DDtnJsZWlu?= <uqs@spoerlein.net> To: Dimitry Andric <dim@freebsd.org> Cc: stable@freebsd.org Subject: Re: stable/9 preferring IPv4 over IPv6, what changed? Message-ID: <20111212185830.GL83814@acme.spoerlein.net> In-Reply-To: <4EE53431.1040609@FreeBSD.org> References: <20111211223327.GJ83814@acme.spoerlein.net> <4EE53431.1040609@FreeBSD.org>
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On Sun, 2011-12-11 at 23:52:33 +0100, Dimitry Andric wrote: > On 2011-12-11 23:33, Ulrich Spörlein wrote: > > long story short: telnet foo on stable/8 will first try connecting via > > IPv6, then via IPv4 (foo has A and AAAA records). On stable/9 it's the > > other way round. > > > > This trips up my setup, where a bunch of hosts (some behind NAT) can all > > talk to each other over their IPv6 addresses (some are tunneled), but > > cannot do so via IPv4. > > > > Is this due to changes in bind or the resolver? > > Most likely due to changes in the IPv6 startup scripts and rc.conf > settings. The behaviour seems to be determined by multiple settings in > rc.conf, first of all: > > ip6addrctl_policy={ipv4_prefer|ipv6_prefer|AUTO} > > where the default value is AUTO. Values of ipv4_prefer and ipv6_prefer > do what you expect them to. > > In case of AUTO, and if you don't have /etc/ip6addrctl.conf with > explicit settings, /etc/rc.d/ip6addrctl checks the value of > ipv6_activate_all_interfaces. If it is YES, IPv6 is preferred, if it is > NO or unset, IPv4 is preferred. > > What are your IPv6-related settings in rc.conf? Well, I had ipv6_enable set from the stable/8 days. The warnings and the code make me believe it should behave as if ipv6_activate_all_interfaces was set, somehow that's not the case, though. I've now set ip6addrctl_policy and everything is back working again. Thanks! Uli
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