Public bug reported:
systemd-resolved, or more precisely the hook script /lib/systemd/system
/systemd-resolved.service.d/resolvconf.conf, causes resolvconf to add
127.0.0.53 to the set of nameservers in /etc/resolv.conf alongside the
other nameservers. That makes no sense because systemd-resolved sets up
127.0.0.53 as a proxy for those other nameservers. The effect is
similar to bug 1624071 but for applications doing their own DNS lookups.
It breaks any DNSSEC validation that systemd-resolved tries to do;
applications will failover to the other nameservers, bypassing
validation failures. And it makes failing queries take twice as long.
/etc/resolv.conf should have only 127.0.0.53 when systemd-resolved is
active.
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1624320
Title:
systemd-resolved appends 127.0.0.53 to resolv.conf alongside existing
entries
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