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[pdf <936712@xxxxxxxxxxxxxxxxxx>]

Please re-open - this is confirmed broken again in Trusty.

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https://bugs.launchpad.net/bugs/936712

Title:
  NetworkManager should put IPv6 DNS servers before IPv4 DNS servers in
  dnsmasq configuration (and possibly resolv.conf)

Status in “network-manager” package in Ubuntu:
  Fix Released

Bug description:
  In cases where you are indeed on a dual-stack network and received DNS
  information from either SLAAC or DHCPv6, these should be used before
  any equivalent IPv4 data (usually a fallback/compatibility layer in
  such environment).

  As an example, here's my generated /run/nm-dns-dnsmasq.conf on an up to date 12.04 system:
  server=172.17.20.30
  server=172.17.25.30
  server=172.16.20.32
  server=2001:470:c364:1020:e084:d1ff:fe38:c4f5
  server=2001:470:c364:1025:8837:98ff:fe43:90e6
  server=2001:470:b4e9:1020:218:51ff:fe5a:9949

  
  The result is that dnsmasq will only use the IPv6 dns servers if all 3 IPv4 dns servers are marked as failed.

  As dnsmasq is perfectly able to detect and avoid broken DNS servers,
  favoritizing IPv6 servers shouldn't cause any damage even in
  environment where the information received by NM is wrong.

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