[Bug 1647178] Re: systemd-resolved unable to resolve certain subdomains

[Louis Bouchard]

** This bug is no longer a duplicate of bug 1647031
   systemd-resolved’s 127.0.0.53 server does not follow CNAME records

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Title:
  systemd-resolved unable to resolve certain subdomains

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  After upgrade to systemd-resolved, certain very well known subdomains
  are no longer resolved. Their TLD do resolve correctly. Example given
  with mail.google.com and google.com

  On xenial :
  $ nslookup mail.google.com
  Server:         192.168.1.1
  Address:        192.168.1.1#53

  Non-authoritative answer:
  mail.google.com canonical name = googlemail.l.google.com.
  Name:   googlemail.l.google.com
  Address: 216.58.198.197

  $ dig mail.google.com

  ; <<>> DiG 9.10.3-P4-Ubuntu <<>> mail.google.com
  ;; global options: +cmd
  ;; Got answer:
  ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57929
  ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

  ;; OPT PSEUDOSECTION:
  ; EDNS: version: 0, flags:; udp: 4000
  ;; QUESTION SECTION:
  ;mail.google.com.               IN      A

  ;; ANSWER SECTION:
  mail.google.com.        441512  IN      CNAME   googlemail.l.google.com.
  googlemail.l.google.com. 274    IN      A       216.58.198.197

  ;; Query time: 14 msec
  ;; SERVER: 192.168.1.1#53(192.168.1.1)
  ;; WHEN: Sun Dec 04 18:12:43 CET 2016
  ;; MSG SIZE  rcvd: 87

  On Zesty using systemd-resolved :

  # nslookup mail.google.com
  Server:         10.0.3.1
  Address:        10.0.3.1#53

  Non-authoritative answer:
  mail.google.com canonical name = googlemail.l.google.com.

  # nslookup google.com
  Server:         10.0.3.1
  Address:        10.0.3.1#53

  Non-authoritative answer:
  Name:   google.com
  Address: 216.58.198.206

  # dig mail.google.com

  ; <<>> DiG 9.10.3-P4-Ubuntu <<>> mail.google.com
  ;; global options: +cmd
  ;; Got answer:
  ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10775
  ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

  ;; OPT PSEUDOSECTION:
  ; EDNS: version: 0, flags:; udp: 4096
  ;; QUESTION SECTION:
  ;mail.google.com.               IN      A

  ;; ANSWER SECTION:
  mail.google.com.        441414  IN      CNAME   googlemail.l.google.com.

  ;; Query time: 0 msec
  ;; SERVER: 10.0.3.1#53(10.0.3.1)
  ;; WHEN: Sun Dec 04 17:14:21 UTC 2016
  ;; MSG SIZE  rcvd: 81

  # dig google.com

  ; <<>> DiG 9.10.3-P4-Ubuntu <<>> google.com
  ;; global options: +cmd
  ;; Got answer:
  ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 25303
  ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

  ;; OPT PSEUDOSECTION:
  ; EDNS: version: 0, flags:; udp: 4096
  ;; QUESTION SECTION:
  ;google.com.                    IN      A

  ;; ANSWER SECTION:
  google.com.             160     IN      A       216.58.198.206

  ;; Query time: 0 msec
  ;; SERVER: 10.0.3.1#53(10.0.3.1)
  ;; WHEN: Sun Dec 04 17:14:37 UTC 2016
  ;; MSG SIZE  rcvd: 55

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