[Bug 1671606] Re: DNS server from vpn connection is not being used after network-manager upgrade to 1.2.6-0ubuntu0.16.04.1

[Nicholas Stommel]

Well, scratch that hope and consider me mistaken about Goth Queen's workaround. It appears that manually setting a fixed DNS server DOES allow for successful reconnect when the network manager is restarted (whereas before it wouldn't reconnect period), but just like this bug https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1631241 name resolution (not using the dnscrypt-proxy service, just a fixed DNS address) fails after waking up from suspend for some frustrating, arcane reason. I have downgraded the following packages:
(credit to Kostadin Stoilov)
sudo apt install network-manager=1.2.2-0ubuntu0.16.04.4
sudo apt install libnm-glib-vpn1=1.2.2-0ubuntu0.16.04.4
sudo apt install libnm-glib4=1.2.2-0ubuntu0.16.04.4
sudo apt install libnm0=1.2.2-0ubuntu0.16.04.4
sudo apt install libnm-util2=1.2.2-0ubuntu0.16.04.4
sudo apt install resolvconf=1.78ubuntu2

and held them in place with 'sudo apt-mark hold' for the time being, as
there appears to be a critical flaw in the updated versions of network-
manager and possibly resolv-conf and dnsmasq. I suppose we just have to
wait until something is fixed.

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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
Status in resolvconf package in Ubuntu:
  Invalid

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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