Should I be using ipv6_activate_all_interfaces or ip6addrctl_policy="ipv6_prefer"

[Chris H]

> On Wed, Aug 27, 2014 at 11:59:25AM +0000, Bjoern A. Zeeb wrote:
>>
>> On 27 Aug 2014, at 06:31 , Jonathan Price <freebsd at jonathanprice.org> wrote:
>>
>> > On 2014-08-27 01:40, Peter Wemm wrote:
>> >> On Tuesday 26 August 2014 10:40:27 freebsd at 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
>> >>>
> ...
>> > 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.
>>
>
> It does not seem so yet (anymore, it was like that many moons ago). A new
> install of 11-current, with the following in rc.conf:
>
> #################
> hostname="fbsd-11-test"
> ifconfig_em0="DHCP"
> ifconfig_em0_ipv6="inet6 accept_rtadv"
> sshd_enable="YES"
> #################
>
> Output of ip6addrctl:
>
> #################
> jhay at fbsd-11-test:~ % ip6addrctl
> Prefix                          Prec Label      Use
> ::1/128                           50     0        0
> ::/0                              40     1       13
> ::ffff:0.0.0.0/96                100     4        0
> 2002::/16                         30     2        0
> 2001::/32                          5     5        0
> fc00::/7                           3    13        0
> ::/96                              1     3        0
> fec0::/10                          1    11        0
> 3ffe::/16                          1    12        0
> jhay at fbsd-11-test:~ %
> #################
>
> telnet to a machine with both ipv6 and ipv4 addresses:
>
> #################
> jhay at fbsd-11-test:~ % telnet dolphin
> Trying 146.64.28.14...
> telnet: connect to address 146.64.28.14: Connection refused
> Trying 2001:4200:7000:3:223:aeff:fea5:ef...
> telnet: connect to address 2001:4200:7000:3:223:aeff:fea5:ef: Connection refused
> telnet: Unable to connect to remote host
> jhay at fbsd-11-test:~ %
> #################
>
> I think if an IPv6 address is configured on a machine, it should prefer ipv6
> addresses. That would match what the rest are doing.
All mine do. As the default, I used the same settings you used above (minus the DHCP).
Only difference I can see, is that I use STATIC (IPv4 && IPv6), and a default
(IPv4 && IPv6) gateway. If I telnet/ftp/ssh to any of my hosts, IPv6 is always
attempted first (opposite of your output above). This was also the case, when
I didn't enter a specific IP in the rc.conf(5). With only the gateway IP address
(IPv4), and an IPv4 address for the I. If I chose
ipv6_activate_all_interfaces="YES"
or
xxx_ipv6="inet6 accept_rtadv"
I always got the coreect IPv6 address, and connection attempts always began
with IPv6 chosen.

I don't know if any of this helps. But thought at least sharing another
experience might.

Best wishes.

--Chris

>
> Regards
>
> John
> --
> John Hay -- jhay at meraka.csir.co.za / jhay at meraka.org.za
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