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In Ubuntu Yakkety the following line in /etc/nsswitch.conf breaks DNS 
resolution via the VPN tunnel created by Sonicwall NetExtender application. 

hosts:          files mdns4_minimal [NOTFOUND=return] resolve [!UNAVAIL=return] 

Changing this line to:

hosts:          files mdns4_minimal [NOTFOUND=return] resolve
[UNAVAIL=return] dns


hosts:         files mdns4_minimal [NOTFOUND=return] dns
[!UNAVAIL=return] resolve

I have not found documentation on what "resolve" means, so im not sure this 
lines makes global sense, but it solve my dns problem. If i have to guess its 
another systemd incarnation.

As a side note NetExtender modifies /etc/resolv.conf and adds the VPN
DNS servers as the first entries. So when NetExtender is connected the
first lines in /etc/resolv.conf contains the VPN DNS IP and only after
there is the local dnsmasq entry.

Sadly i could not found which package creates this file as "dpkg-query
-S /etc/nsswitch.conf" returns no results on my system.

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: libnss3 2:3.26-1ubuntu1
ProcVersionSignature: Ubuntu 4.8.0-21.23-generic 4.8.0
Uname: Linux 4.8.0-21-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl nvidia_uvm nvidia_drm 
nvidia_modeset nvidia
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Oct 12 13:58:41 2016
InstallationDate: Installed on 2016-07-27 (76 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: nss
UpgradeStatus: Upgraded to yakkety on 2016-10-07 (4 days ago)

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug nsswitch.conf yakkety
SonicWall NetExteder broken by new nsswitch.conf configuration
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