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

[Peter Goodall]

I have the same problem with 237-3ubuntu10.39 amd64

```
systemd-resolved[2198]: message repeated 3 times: [ Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.]

 % lsb_release -a 
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.4 LTS
Release:	18.04
Codename:	bionic


% apt list systemd   
Listing... Done
systemd/bionic-updates,now 237-3ubuntu10.39 amd64 [installed,automatic]
N: There are 2 additional versions. Please use the '-a' switch to see them.

```

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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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