pfSense

I have configured a wildcard record in DNS forwarder, supplied in the "custom options" like the following:

address=/example.com/10.0.0.1

and host overrides:

example.com -> 10.0.0.1
a.example.com -> 10.0.0.1
b.example.com -> 10.0.0.2

On a Ubuntu 18.04 machine, running a lookup specifying IPv6

systemd-resolve -6 b.example.com

yields:

b.example.com: resolve call failed: 'a.nowhow.ch' does not have any RR of the requested type

This request adds, however, an entry in the cache of systemd-resolved:

#011b.example.com IN CNAME a.example.com

(this can be seen from running "sudo killall -USR1 systemd-resolved" and looking at the syslog.)

Running

systemd-resolve -4 b.example.com

now results in

b.example.com: 10.0.0.1
                  (a.example.com)

This behaviour seems to be new to 2.6.0 and resulted in wrong DNS lookups, as systemd-resolved seems to aquire both IPv4 and IPv6 addresses by default (according to man pages)