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

[Frans van Berckel]

Extra question: is Server returned error NXDOMAIN, mitigating potential
DNS violation DVE-2018-0001, retrying transaction with reduced feature
level UDP, as pointed related?

https://www.linode.com/community/questions/17384/error-server-returned-
error-nxdomain-mitigating-potential-dns-violation-dve-2018

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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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