[Bug 1822416] [NEW] resolve: do not hit CNAME or DNAME entry in NODATA cache

[Frans van Berckel]

Public bug reported:

The question: DNS A record lookups fail to resolve due to cached CNAME
NODATA lookups ...

https://askubuntu.com/questions/1063462/18-04-server-systemd-resolve-
returns-cached-cname-nodata-for-a-lookup

Upstream at Github: Systemd issue 998 - Cached cname NODATA returned for
A lookup ...

https://github.com/systemd/systemd/issues/9833


Please patch ...

https://github.com/systemd/systemd/commit/3740146a4cbd99883af79e375ee4836206dcea4e

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 18.04 systemd-resolved

** Tags added: 18.04

** Tags added: systemd-resolved

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https://bugs.launchpad.net/bugs/1822416

Title:
  resolve: do not hit CNAME or DNAME entry in NODATA cache

Status in systemd package in Ubuntu:
  New

Bug description:
  The question: DNS A record lookups fail to resolve due to cached CNAME
  NODATA lookups ...

  https://askubuntu.com/questions/1063462/18-04-server-systemd-resolve-
  returns-cached-cname-nodata-for-a-lookup

  Upstream at Github: Systemd issue 998 - Cached cname NODATA returned
  for A lookup ...

  https://github.com/systemd/systemd/issues/9833

  
  Please patch ...

  https://github.com/systemd/systemd/commit/3740146a4cbd99883af79e375ee4836206dcea4e

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