** Merge proposal unlinked:
   
https://code.launchpad.net/~osomon/network-manager/+git/network-manager/+merge/361051

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https://bugs.launchpad.net/bugs/1754671

Title:
  Full-tunnel VPN DNS leakage regression

Status in NetworkManager:
  Fix Released
Status in network-manager package in Ubuntu:
  Fix Released
Status in network-manager source package in Bionic:
  Confirmed

Bug description:
  * Impact

  When using a VPN the DNS requests might still be sent to a DNS server
  outside the VPN when they should not

  * Test case

  Configure the system to send all the traffic to a VPN, do a name
  resolution, the request should not go to the public DNS server (to be
  checked by capturing the traffic by example with wireshark)

  
  * Regression potential

  The code change the handling of DNS servers when using a VPN, we
  should check that name resolution still work whne using a VPN in
  different configurations

  -----------------

  
  In 16.04 the NetworkManager package used to carry this patch:
  
http://bazaar.launchpad.net/~network-manager/network-manager/ubuntu/view/head:/debian/patches/Filter-DNS-servers-to-add-to-dnsmasq-based-on-availa.patch

  It fixed the DNS setup so that when I'm on the VPN, I am not sending
  unencrypted DNS queries to the (potentially hostile) local
  nameservers.

  This patch disappeared in an update. I think it was present in
  1.2.2-0ubuntu0.16.04.4 but was dropped some time later.

  This security bug exists upstream too: 
https://bugzilla.gnome.org/show_bug.cgi?id=746422
  It's not a *regression* there though, as they didn't fix it yet 
(unfortunately!)

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