Resolve WAN as LAN on Turris
Making hairpin/loopback/reflection requests on public URLs is not complicated but the information is well hidden from Turris users. (None of this is accessible from the Luci GUI.)
In /etc/config/resolver, you need this stanza:
config resolver 'kresd' option rundir '/tmp/kresd' option log_stderr '1' option log_stdout '1' option keep_cache '1' option include_config '/etc/kresd/custom.conf'
Create the /etc/kresd/custom.conf file.
Fill up custom.conf with "hints":
hints['mon.sous.domaine.fr'] = '192.0.2.118'
In my own case, the file is:
hints['oneeyedman.net'] = '192.168.2.2'
hints['www.oneeyedman.net'] = '192.168.2.2'
hints['state-sponsored-actors.org'] = '192.168.2.2'
hints['www.state-sponsored-actors.org'] = '192.168.2.2'
hints['payments.brechtsociety.org'] = '192.168.2.2'
hints['txl.oneeyedman.net'] = 'berlin3.chickenkiller.com'
hints['ads-b.oneeyedman.net'] = '192.168.4.4'
Restart the kresd daemon.
Sources:
Sort of useful -- https://wiki.turris.cz/doc/en/public/dns_knot_misc
Totally useless -- https://knot-resolver.readthedocs.io/en/stable/modules-hints.html
Other confused people -- https://forum.turris.cz/t/configure-kresd-to-resolve-a-wan-address-to-a-lan-ip/13597/15