This bug fix corrected my VPN leaks in Ubuntu 16.10, but I've since
upgraded to 17.04 (fresh install) and I'm seeing DNS leaks again. Should
this issue be fixed in Zesty already, or is that coming later?

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https://bugs.launchpad.net/bugs/1639776

Title:
  name resolution (dnsmasq) fails to send queries out after
  suspend/resume reconnects the interface

Status in dnsmasq package in Ubuntu:
  Fix Released
Status in network-manager package in Ubuntu:
  Invalid
Status in dnsmasq source package in Xenial:
  Fix Released
Status in network-manager source package in Xenial:
  Invalid
Status in dnsmasq source package in Yakkety:
  Fix Released
Status in network-manager source package in Yakkety:
  Invalid
Status in dnsmasq package in Debian:
  Fix Released

Bug description:
  [Impact]

   * suspend/resume (which involves disconnection of network devices)
  leads to dnsmasq failures.

  [Test Case]

   * suspend/resume on 16.04 or 16.10 when using dnsmasq, and see
  failures upon resume.

  [Regression Potential]

   * The fix was NMU'd in Debian in the version immediately after
  16.10's. I believe the regression potential is very low as this is a
  clear bug-fix from upstream.

  ---

  Failure is caused by ENODEV return for all dns queries like:
  sendto(11, "\232\325\1\0\0\1\0\0\0\0\0\0\4mail\6google\3com\0\0\1\0"..., 33, 
0, {sa_family=AF_INET, sin_port=htons(53), 
sin_addr=inet_addr("62.241.198.245")}, 16) = -1 ENODEV (No such device)

  Problem is reported and fixed:
  https://bugzilla.redhat.com/show_bug.cgi?id=1367772

  
http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=2675f2061525bc954be14988d64384b74aa7bf8b

  I didn't yet test if applying that patch to ubuntu package works. I
  will try the patch in a few hours.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: dnsmasq-base 2.76-4
  ProcVersionSignature: Ubuntu 4.8.0-26.28-generic 4.8.0
  Uname: Linux 4.8.0-26-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Mon Nov  7 14:11:51 2016
  InstallationDate: Installed on 2037-12-25 (-7718 days ago)
  InstallationMedia: Lubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  SourcePackage: dnsmasq
  UpgradeStatus: Upgraded to yakkety on 2016-10-21 (16 days ago)

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