network-manager:amd64 (1.2.2-0ubuntu0.16.04.4, 1.2.6-0ubuntu0.16.04.1)

I'm seeing a very similar problem, except I'm using a PPTP tunnel. I'm
on a Mint MATE 18.1 distro.  On approximately 3/8/2017 the network
manager package was updated and about that time is when name resolution
stopped working when connected to a PPTP tunnel.

I can see that the ppp0 interface is getting a DHCP address from the remote 
end, and it is also receiving a DNS IP address for the remote network.  That 
information gets populated into 'etc/ppp/resolv.conf' and the timestamp for 
that file corresponds to the date/time I establish the PPTP connection. 
 
I am able to reach machines on the remote network by IP address.  This worked 
as of last week (approx 3/8/2017) and had been working for a year or more prior.

I'm not sure how the local resolver stuff works, but it seems like the
proper information is being retrieved from the remote end point (IP
address, DNS info, etc.), but the local resolver is not pulling in the
information.

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https://bugs.launchpad.net/bugs/1671606

Title:
  DNS server from vpn connection is not being used after network-manager
  upgrade to 1.2.6-0ubuntu0.16.04.1

Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  I use my company's cisco vpn via network-manager in Ubuntu 16.04.2
  LTS. After recent upgrade of network-manager:amd64 from version
  1.2.2-0ubuntu0.16.04.4 to version 1.2.6-0ubuntu0.16.04.1 DNS
  resolution of VPN's server hostnames does not work. Roll back to
  version 1.2.2-0ubuntu0.16.04.4 solves the problem.

  Steps for reproducing:
  1. upgrade network-manager:amd64 from version 1.2.2-0ubuntu0.16.04.4 to 
version 1.2.6-0ubuntu0.16.04.1
  2. connect to VPN via network-manager applet
  3. nslookop servername.internal --> ** server can't find servername.internal: 
NXDOMAIN
  4. disconnect from VPN via network-manager applet
  5. roll back network-manager via command: sudo apt-get install 
network-manager=1.2.2-0ubuntu0.16.04.4
  6. restart network-manager via sudo service network-manager restart
  7. connect to VPN via network-manager applet
  8. nslookop servername.internal --> the server is resolved correctly

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: network-manager 1.2.6-0ubuntu0.16.04.1
  ProcVersionSignature: Ubuntu 4.4.0-66.87-generic 4.4.44
  Uname: Linux 4.4.0-66-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Mar  9 19:49:55 2017
  InstallationDate: Installed on 2015-10-05 (520 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-nm:
   RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  
WIFI     WWAN-HW  WWAN
   running  1.2.6    connected  started  full          enabled     enabled  
enabled  enabled  enabled

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