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>
next in thread | previous in thread | raw e-mail | index | archive | help
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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20111212185830.GL83814>