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[Nicolas Delvaux <995332@xxxxxxxxxxxxxxxxxx>]

On Wily, I edited /etc/dnsmasq.d/network-manager and added the following
lines:

# DNSSEC setup
dnssec
trust-anchor=.,19036,8,2,49AAC11D7B6F6446702E54A1607371607A1A41855200FD2CE1CDDE32F24E8FB5
dnssec-check-unsigned

I then restarted network-manager and tried to connect to http://www.dnssec-failed.org/.
As expected, the site does not load (it is deliberately configured to fail DNSSEC validation).
But when reloading the page multiple-time, it is sometime displayed! I don't understand why.

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Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/995332

Title:
  Please enhance NetworkManager such that DNSSEC validation is done
  whenever possible

Status in dnsmasq package in Ubuntu:
  Invalid
Status in network-manager package in Ubuntu:
  Triaged

Bug description:
  Network Manager in Precise uses a local forwarding DNS server
  (dnsmasq).  This does not perform DNSSEC validation, although it is
  configured to proxy the DNSSEC validation result from the upstream
  server, for which the manpage mentions the following caveat:

  "You should only do this if you trust all the configured upstream
  nameservers and the network between you and them."

  Since not all networks or upstream DNS servers are trustworthy, the
  safest place to perform DNSSEC validation is on the client.  Using a
  local DNS server which cannot validate is a missed opportunity; by
  replacing dnsmasq with a more-capable DNS server (e.g. Unbound)
  security against DNS poisoning and MITM attacks could be improved.

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