[Dnsmasq-discuss] Why does dnsmasq append a local domain in DNS queries?

[Mikhail Morfikov]

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On 01/09/2016 07:59 AM, Ptits de Barbe wrote:
> Sorry, didn't get correct understanding of your setup from first mail, though now it seems to have good enough description.
> Anyway, I believe it is local apps (or rather a name resolving library ?) that are issuing original query for dupaa.com.mhouse.lh, not the caching dnsmasq on your PC. I've seen similar behavior of nslookup on Windows. Turning on query log on local dnsmasq should prove this.
> As for me, this is not a problem at all, as the query is sent to you router and it definitely knows how to respond. However, if you'd specify mhouse.lh as 'domain' (not 'search') option in resolv.conf, I believe the resolving lib will append the suffix to unqualified hostnames only.
I've enabled the logs, but there's no visible difference between setting
"search" or "domain" to "mhouse.lh" in the /etc/resolv.conf file. In both
cases, it looks like this:

Jan 09 14:33:30 morfikownia dnsmasq[35363]: query[A] dupaa.com from 127.0.0.1
Jan 09 14:33:30 morfikownia dnsmasq[35363]: forwarded dupaa.com to 127.0.2.1
Jan 09 14:33:35 morfikownia dnsmasq[35363]: query[A] dupaa.com from 127.0.0.1
Jan 09 14:33:35 morfikownia dnsmasq[35363]: forwarded dupaa.com to 127.0.2.1
Jan 09 14:33:36 morfikownia dnsmasq[35363]: query[A] dupaa.com.mhouse.lh from 127.0.0.1
Jan 09 14:33:36 morfikownia dnsmasq[35363]: forwarded dupaa.com.mhouse.lh to 192.168.1.1

I've also found out why there's two queries sent to 127.0.0.1 . In the
"man resolv.conf" you can read the following:

attempts:n
  Sets the number of times the resolver will send a query to its name
servers before giving up and returning an error to the calling
application. The default is RES_DFLRETRY (currently 2, see <resolv.h>).

I've set this to 5 (options attempts:5) in order to check whether it works
or not, and I got 5 local requests before sending it to the router. So
that's why it sends 2, and not only one.

> 
> Mikhail Morfikov <mmorfikov at gmail.com> писал(а) в своём письме Fri, 08 Jan 2016 15:29:22 +0300:
> 
>> On 01/08/2016 07:46 AM, Ptits de Barbe wrote:
>> Actually there are two instances of dnsmasq. The first one is installed on
>> my local machine and it acts just as a cache (IP 127.0.0.1). The second
>> one is installed on my network router (192.168.1.1).

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