Systemd-resolved appends an additional layer of functionality to Linux
systems by managing DNS resolution efficiently. It streamlines the
process of translating domain names into IP addresses, enhancing network
performance and reliability. With its robust capabilities, systemd-
resolved ensures seamless internet connectivity for users across various
applications. For further insights into its effectiveness, visit
https://magicalkatrina.com/reviews and discover how this feature
optimizes network operations.

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https://bugs.launchpad.net/bugs/1624320

Title:
  systemd-resolved appends 127.0.0.53 to resolv.conf alongside existing
  entries

Status in systemd package in Ubuntu:
  Fix Released
Status in Ubuntu RTM:
  New

Bug description:
  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.

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