[Bug 1668296] [NEW] not failing back to IPv4 when AAAA returns SERVFAIL

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Public bug reported:

A reocrd exists, AAAA returns SERVFAIL, in this case resolution fails
instead of falling back to IPv4 A record


$ host www.fidelityrewards.com
www.fidelityrewards.com has address 170.135.184.45
Host www.fidelityrewards.com not found: 2(SERVFAIL)

$ wget www.fidelityrewards.com
--2017-02-27 07:41:57--  http://www.fidelityrewards.com/
Resolving www.fidelityrewards.com (www.fidelityrewards.com)... failed: Name or service not known.
wget: unable to resolve host address ‘www.fidelityrewards.com

/etc/nsswitch.conf
hosts:          files myhostname mdns4_minimal [NOTFOUND=return] resolve [!UNAVAIL=return] dns wins 


libnss-resolve 231-9ubuntu3

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

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https://bugs.launchpad.net/bugs/1668296

Title:
  not failing back to IPv4 when AAAA returns SERVFAIL

Status in systemd package in Ubuntu:
  New

Bug description:
  A reocrd exists, AAAA returns SERVFAIL, in this case resolution fails
  instead of falling back to IPv4 A record

  
  $ host www.fidelityrewards.com
  www.fidelityrewards.com has address 170.135.184.45
  Host www.fidelityrewards.com not found: 2(SERVFAIL)

  $ wget www.fidelityrewards.com
  --2017-02-27 07:41:57--  http://www.fidelityrewards.com/
  Resolving www.fidelityrewards.com (www.fidelityrewards.com)... failed: Name or service not known.
  wget: unable to resolve host address ‘www.fidelityrewards.com

  /etc/nsswitch.conf
  hosts:          files myhostname mdns4_minimal [NOTFOUND=return] resolve [!UNAVAIL=return] dns wins 

  
  libnss-resolve 231-9ubuntu3

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