*** This bug is a duplicate of bug 1688018 ***
    https://bugs.launchpad.net/bugs/1688018

I did some tests, and can confirm that with n-m 1.2.6-0ubuntu0.16.04.1 my local 
DNS (sent via dhcp to the machine) is also added to the DNS server list when 
the VPN is established:
Aug 31 20:36:32 31-64 dnsmasq[1118]: setting upstream servers from DBus
Aug 31 20:36:32 31-64 dnsmasq[1118]: using nameserver 10.0.5.5#53(via ens3)
Aug 31 20:36:32 31-64 dnsmasq[1118]: using nameserver 10.172.64.1#53 for domain 
private
Aug 31 20:36:32 31-64 dnsmasq[1118]: using nameserver 10.172.64.1#53 for domain 
internal
(...)

The line about using the 10.0.5.5 nameserver does not appear the logs
when using n-m 1.2.2.

As far as I can see, there are two other bugs filed about this:
bug #1671606 DNS server from vpn connection is not being used after 
network-manager upgrade to 1.2.6-0ubuntu0.16.04.1
bug #1688018 DNS server from vpn connection is not being used after 
network-manager upgrade to 1.2.6


** This bug has been marked a duplicate of bug 1688018
   DNS server from vpn connection is not being used after network-manager 
upgrade to 1.2.6

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https://bugs.launchpad.net/bugs/1704288

Title:
  Ubuntu 16.04 VPN : DNS information leaking  through dnsmasq

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