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[Thomas Hood <1414887@xxxxxxxxxxxxxxxxxx>]

Ubuntu 13.10 (Saucy) included dnsmasq 2.66 or so. In dnsmasq 2.69 an
important change was made which may be the cause of your problem. This
change affects Ubuntu 14.10 and later, but not Ubuntu 14.04LTS (Trusty)
which shipped with dnsmasq 2.68-1. The change is mentioned in the
changelog (quoted below) and it should be obvious how this might be
affecting you. Read the new dnsmasq manpage for a longer description of
the "local-service" option.

dnsmasq (2.69-1) unstable; urgency=low

   * New upstream.
   * Set --local-service. (closes: #732610)
     This tells dnsmasq to ignore DNS requests that don't come
     from a local network. It's automatically ignored if
     --interface --except-interface, --listen-address or
     --auth-server exist in the configuration, so for most
     installations, it will have no effect, but for
     otherwise-unconfigured installations, it stops dnsmasq
     from being vulnerable to DNS-reflection attacks.

 -- Simon Kelley <simon@xxxxxxxxxxxxxxxxx>  Tue, 4 Feb 2014 16:28:12
+0000


** Changed in: dnsmasq (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1414887

Title:
  dns query from localnetwork are blocked

Status in dnsmasq package in Ubuntu:
  Incomplete

Bug description:
  Hi,

  I followed the following to config dnsmasq as DHCP and DNS server
  http://sfxpt.wordpress.com/2013/11/30/dnsmasq-installation-
  configuration-5/

  It works well till Ubuntu 13.10. However, with Ubuntu 14.10, the dns
  query from localnetwork will always timeout. The configurations are
  exactly the same, What could be the problem?

  From within localnetwork:

  ~~~
  $ dig google.ca

  ; <<>> DiG 9.9.5-4.3-Ubuntu <<>> google.ca
  ;; global options: +cmd
  ;; connection timed out; no servers could be reached

  dig @192.168.2.100 maroon

  ; <<>> DiG 9.9.5-4.3-Ubuntu <<>> @192.168.2.100 maroon
  ; (1 server found)
  ;; global options: +cmd
  ;; connection timed out; no servers could be reached
  ~~~

  On the DNS sever itself:

  ~~~
  $ dig google.ca @127.0.0.1
  ...
  ;; ANSWER SECTION:
  google.ca.              299     IN      A       173.194.43.111
  ...
  ;; Query time: 50 msec
  ;; SERVER: 127.0.0.1#53(127.0.0.1)

  $ dig @192.168.2.100 maroon
  ...
  ;; ANSWER SECTION:
  maroon.                 0       IN      A       192.168.2.100

  ;; Query time: 1 msec
  ;; SERVER: 192.168.2.100#53(192.168.2.100)
  ...
  ~~~

  This is the debug output from dnsmasq log:

  ~~~
  Jan  1 13:26:10 maroon dnsmasq[2833]: reply google.ca is 173.194.43.119
  Jan  1 13:26:10 maroon dnsmasq[2833]: reply google.ca is 173.194.43.120
      *** DEBUG 2015-01-01 13:26:21-05:00 DEBUG ***
  Jan  1 13:27:42 maroon dnsmasq[2833]: query[A] maroon from 192.168.2.100
  Jan  1 13:27:42 maroon dnsmasq[2833]: /etc/dnsmasq.hosts maroon is
  192.168.2.100
      *** DEBUG 2015-01-01 13:28:19-05:00 DEBUG ***
  ~~~

  All other dns queries from localnetwork did not generate any log entries.
  So, because the local dns query work, I think something is blocking the dnsmasq
   from sending the dns query results back to localnetwork. What could it
  be?

  I didn't limit the dnsmasq listen address:

  ~~~
  $ grep listen-address /etc/dnsmasq.conf /etc/dnsmasq.d/*
  /etc/dnsmasq.conf:#listen-address=
  ~~~

  My /etc/hosts.deny and hosts.allow files are untouched either, and I can
  ping my DNS server, and ssh into its IP address as well. So I think the
  blocking is only at the DNS level since other access are just fine. It is
  not because of iptables rules either:

  $ sudo iptables-save | wc
        0       0       0

  I've installed dnsmasq on two different machines, one being freshly
  installed today, and both of them are showing exactly the  same
  symptom. Again, it only happens to Ubuntu 14.10. It was working well
  till Ubuntu 13.10 before.

  I've run out of all the possibilities.
  What could be the problem?

  Thanks

  $ lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 14.10
  Release:        14.10
  Codename:       utopic

  $ apt-cache policy dnsmasq
  dnsmasq:
    Installed: 2.71-1
    Candidate: 2.71-1
    Version table:
   *** 2.71-1 0
          500 http://us.archive.ubuntu.com/ubuntu/ utopic/universe amd64 Packages
          100 /var/lib/dpkg/status

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