Just as a short reminder, there are more DNS-resolver/server available as 
packages out there than just bind and dnsmasq, i.e. djbdns and it's derivates. 
Until I removed the annoying dns=dnsmasq line in /e/N/Nconf, NM disconnected 
the WLAN after a couple of minutes, throwing an error about dnsmasq not able to 
bind to 127.0.0.1.
I'm  puzzled about the default inclusion of dnsmasq as a local resolver for 
standard users. If a connection is to be shared, it might be useful to bind 
dnsmasq to the shared iface to provide DHCP and DNS, like it's done with 
libvirt-bin.

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https://bugs.launchpad.net/bugs/959037

Title:
  Don't start local resolver if a DNS server is installed

Status in “dnsmasq” package in Ubuntu:
  Confirmed
Status in “network-manager” package in Ubuntu:
  Triaged

Bug description:
  As described in
  https://blueprints.launchpad.net/ubuntu/+spec/foundations-p-dns-
  resolving, network manager now starts a dnsmasq instance for local DNS
  resolving.

  That breaks the default bind9 and dnsmasq installations, for people that 
actually want to install a DNS server.
  Having to manually comment out "#dns=dnsmasq" in 
/etc/NetworkManager/NetworkManager.conf doesn't sound good, and if it stays 
that way, it should be moved to the bind9 and dnsmasq postinst scripts.

  Please make network-manager smarter so that it checks if bind9 or
  dnsmasq are installed, so that it doesn't start the local resolver in
  that case.

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