Dear Janne,

25 Oct 18 16:04, you wrote to you:

 JJ> On 2018-10-25 09:06, Janne Johansson : Benny Pedersen wrote:
 >> On 2018-10-25 00:40, Benny Pedersen : Michiel van der Vlist wrote:
 >>>  MvdV> and up).  If the destination address is a 6to4 tunnel
 >>> address
 >>>  MvdV> (2002::/16) many OSs default to IPv4 if an IPv4 address is
 >>> present.
 >>>
 >>> time to update to a later glibc where ipv6 is prefered over ipv4
 >>> failback
 >>
 >> I think its mostly a setting in your resolv.conf or similar file to
 >> change default priority of v4 or v6 and not so much a age-of-glibc
 >> issue.

 JJ> Also, at least OpenBSD (if we are still at 'Many OSes') defaults to
 JJ> prefer v4, with a resolv.conf option:
 JJ> family inet6 inet4
 JJ> to flip it around if you want it the other way around.

For FreeBSD, it's in /etc/rc.conf

ip6addrctl_enable="YES"
ip6addrctl_policy="ipv6_prefer"

and /etc/ip6addrctl.conf for fine-tuning the address selection policy:

root@vas:~ # ip6addrctl show
Prefix                          Prec Label      Use
::1/128                           50     0    14494
::/0                              40     1   491602
::ffff:0.0.0.0/96                 35     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
root@vas:~ #




Victor Sudakov, VAS4-RIPE, VAS47-RIPN
--- GoldED+/BSD 1.1.5-b20160322-b20160322