[Dnsmasq-discuss] UDP DNS Requests

Mike Owens mike at transpireinc.com
Fri Jan 13 17:30:28 GMT 2012


Sorry I should have mentioned that before. digg and all DNS requests on the
local machine work fine.

On Fri, Jan 13, 2012 at 4:00 AM, <
dnsmasq-discuss-request at lists.thekelleys.org.uk> wrote:

> Message: 2
> Date: Fri, 13 Jan 2012 11:57:11 +0000
> From: Simon Kelley <simon at thekelleys.org.uk>
> To: dnsmasq-discuss at lists.thekelleys.org.uk
> Subject: Re: [Dnsmasq-discuss] UDP DNS Requests
> Message-ID: <4F101C17.3080205 at thekelleys.org.uk>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> On 12/01/12 01:56, Mike Owens wrote:
> > I am able to get a UDP reply from the socket using nc. TCP requests are
> > handled fine. No UDP requests show up in the log. UDP request to the
> > upstream DNS server are answered fine when queried directly. Is there
> > anything that can cause UDP requests to be blocked other than a
> > firewall? The router isn't blocking UDP. This seems to be only dnsmasq.
> >
> > Output from Dig:
> >
> > [ ~]$ dig debian.org <http://debian.org> @192.168.1.115
> > <http://192.168.1.115>
> >
> > ; <<>> DiG 9.7.3-P3-RedHat-9.7.3-8.P3.el6 <<>> debian.org
> > <http://debian.org> @192.168.1.115 <http://192.168.1.115>
> > ;; global options: +cmd
> > ;; connection timed out; no servers could be reached
> > [ ~]$ dig +tcp debian.org <http://debian.org> @192.168.1.115
> > <http://192.168.1.115>
> >
> > ; <<>> DiG 9.7.3-P3-RedHat-9.7.3-8.P3.el6 <<>> +tcp debian.org
> > <http://debian.org> @192.168.1.115 <http://192.168.1.115>
> > ;; global options: +cmd
> > ;; Got answer:
> > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34510
> > ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
> >
> > ;; QUESTION SECTION:
> > ;debian.org <http://debian.org>.            IN    A
> >
> > ;; ANSWER SECTION:
> > debian.org <http://debian.org>.        1992    IN    A    206.12.19.7
> > debian.org <http://debian.org>.        1992    IN    A    128.31.0.51
> >
> > ;; Query time: 56 msec
> > ;; SERVER: 192.168.1.115#53(192.168.1.115)
> > ;; WHEN: Wed Jan 11 17:47:47 2012
> > ;; MSG SIZE  rcvd: 60
> >
> >
>
> So what happens if you
>
> dig @127.0.0.1 debian.org
>
> on the machine running dnsmasq?
>
> Cheers,
>
> Simon.
>
>
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