$ sudo systemctl stop systemd-resolved
$ sudo SYSTEMD_LOG_LEVEL=debug /lib/systemd/systemd-resolved
[...]
Got message type=method_call sender=:1.1266 destination=org.freedesktop.resolve1 object=/org/freedesktop/resolve1 interface=org.freedesktop.resolve1.Manager member=ResolveHostname cookie=2 reply_cookie=0 error=n/a
Looking up RR for becquer.dodds.net IN A.
Looking up RR for becquer.dodds.net IN AAAA.
Sent message type=method_call sender=n/a destination=org.freedesktop.DBus object=/org/freedesktop/DBus interface=org.freedesktop.DBus member=AddMatch cookie=4 reply_cookie=0 error=n/a
Got message type=method_return sender=org.freedesktop.DBus destination=:1.1265 object=n/a interface=n/a member=n/a cookie=6 reply_cookie=4 error=n/a
Sent message type=method_call sender=n/a destination=org.freedesktop.DBus object=/org/freedesktop/DBus interface=org.freedesktop.DBus member=GetNameOwner cookie=5 reply_cookie=0 error=n/a
Got message type=method_return sender=org.freedesktop.DBus destination=:1.1265 object=n/a interface=n/a member=n/a cookie=7 reply_cookie=5 error=n/a
Cache miss for becquer.dodds.net IN AAAA
Transaction 38842 for <becquer.dodds.net IN AAAA> scope dns on */*.
Using feature level UDP+EDNS0+DO+LARGE for transaction 38842.
Using DNS server 192.168.2.1 for transaction 38842.
Sending query packet with id 38842.
Cache miss for becquer.dodds.net IN A
Transaction 23790 for <becquer.dodds.net IN A> scope dns on */*.
Using feature level UDP+EDNS0+DO+LARGE for transaction 23790.
Using DNS server 192.168.2.1 for transaction 23790.
Sending query packet with id 23790.
Processing incoming packet on transaction 38842.
OPT RR in wrong section, ignoring.
Verified we get a response at feature level UDP from DNS server 192.168.2.1.
Server doesn't support EDNS(0) properly, downgrading feature level...
Using degraded feature set (UDP) for DNS server 192.168.2.1.
Server feature level is now lower than when we began our transaction. Restarting with new ID.
Transaction 38842 is now 35741.
Cache miss for becquer.dodds.net IN AAAA
Transaction 35741 for <becquer.dodds.net IN AAAA> scope dns on */*.
Using feature level UDP for transaction 35741.
Sending query packet with id 35741.
Processing incoming packet on transaction 23790.
OPT RR in wrong section, ignoring.
Server feature level is now lower than when we began our transaction. Restarting with new ID.
Transaction 23790 is now 7141.
Cache miss for becquer.dodds.net IN A
Transaction 7141 for <becquer.dodds.net IN A> scope dns on */*.
Using feature level UDP for transaction 7141.
Sending query packet with id 7141.
Processing incoming packet on transaction 35741.
Not validating response for 35741, used server feature level does not support DNSSEC.
Server 192.168.2.1 does not support DNSSEC, downgrading to non-DNSSEC mode.
Added positive unauthenticated cache entry for becquer.dodds.net IN AAAA 7200s on */INET/192.168.2.1
Transaction 35741 for <becquer.dodds.net IN AAAA> on scope dns on */* now complete with <success> from network (unsigned).
Processing incoming packet on transaction 7141.
Not validating response for 7141, used server feature level does not support DNSSEC.
Added positive unauthenticated cache entry for becquer.dodds.net IN A 339s on */INET/192.168.2.1
Transaction 7141 for <becquer.dodds.net IN A> on scope dns on */* now complete with <success> from network (unsigned).
Freeing transaction 35741.
Sent message type=method_return sender=n/a destination=:1.1266 object=n/a interface=n/a member=n/a cookie=6 reply_cookie=2 error=n/a
Sent message type=method_call sender=n/a destination=org.freedesktop.DBus object=/org/freedesktop/DBus interface=org.freedesktop.DBus member=RemoveMatch cookie=7 reply_cookie=0 error=n/a
Got message type=method_return sender=org.freedesktop.DBus destination=:1.1265 object=n/a interface=n/a member=n/a cookie=8 reply_cookie=7 error=n/a
Freeing transaction 7141.