On Wednesday, 12 August 2026 02:27:29 Pacific Daylight Time Mårten Nordheim via Interest wrote: > As far as I remember, what is preferred depends on what is returned first in > the DNS query, so if the AAAA listings are first then we try IPv6 first > currently.
The sorting of the resolver reply does not depend on the order of receiving
DNS queries. The resolver should sort the replies according to RFC 6724: IPv6
is sorted first if you have an active, IPv6 address of matching scope (local
global to remote global), otherwise they should appear after IPv4.
For example, right now I am at home and have IPv6:
$ resolvectl query irc.libera.chat
irc.libera.chat: 2001:708:40:2001::11ba -- link: bond0
2001:4b7a:a008::6667 -- link: bond0
2604:6600:2002:15::2 -- link: bond0
108.181.132.149 -- link: bond0
46.16.175.175 -- link: bond0
195.148.124.80 -- link: bond0
And once I got to the office:
$ resolvectl query irc.libera.chat
irc.libera.chat: 108.181.132.149 -- link: rtk000001000000
195.148.124.80 -- link: rtk000001000000
93.158.237.2 -- link: rtk000001000000
2a0f:85c2:106:220::10 -- link: rtk000001000000
2001:6b0:78::100 -- link: rtk000001000000
2620:95:4007::95 -- link: rtk000001000000
--
Thiago Macieira - thiago.macieira (AT) intel.com
Principal Engineer - Intel DCG - Platform & Sys. Eng.
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