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

[Dan Streetman]

> Server returned error NXDOMAIN, mitigating potential DNS violation
DVE-2018-0001, retrying transaction with reduced feature level UDP.


the 'NXDOMAIN' messages are not related to this bug, a bit more detail is in this comment
https://bugs.launchpad.net/ubuntu/bionic/+source/systemd/+bug/1785383/comments/12

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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:
  Fix Released
Status in systemd source package in Bionic:
  Fix Released
Status in systemd source package in Disco:
  Fix Released
Status in systemd source package in Eoan:
  Fix Released
Status in systemd source package in Focal:
  Fix Released

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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