[Bug 1668771] Re: systemd-resolved negative caching for extended period of time

[Jorge Niedbalski]

The proposal to extend the 'cache' option with 'no-negative' has been
merged upstream. I will proceed with the backports to Ubuntu on the
affected LTS releases.

[0] https://github.com/systemd/systemd/pull/13047

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Title:
  systemd-resolved negative caching for extended period of time

Status in systemd:
  New
Status in systemd package in Ubuntu:
  In Progress

Bug description:
  231-9ubuntu3

  If a DNS lookup returns SERVFAIL, systemd-resolved seems to cache the
  result for very long (infinity?). I have to restart systemd-resolved
  to have the negative caching purged.

  After SERVFAIL DNS server issue has been resolved, chromium/firefox
  still returns DNS error despite host can correctly resolve the name.

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