[Dnsmasq-discuss] DNSMasq caching DNS query after restart?

Piero ottuzzi at gmail.com
Wed Aug 26 09:31:15 BST 2009


2009/8/25 Matthias Andree <matthias.andree at gmx.de>:
> Piero schrieb:
>> Hi there,
>>
>>    I have a strange issue with DNSMasq: it looks like it saves dns
>> cached query and keep them after a restart.
>> Here is the problem: the host opaplnx13 didn't reverse lookup and I
>> saw this in DNSMasq logs. I fixed the problem in "master DNS servers"
>> and they actually reverse lookup opaplnx13 correctly but DNSMasq
>> actually does not. It doesn't even after a restart.
>>
>> 10.145.3.71 and 10.145.3.72 are DNSMasq servers
>> 10.145.1.121 is a master server
>>
>> [root at opaplnx23 etc]# nslookup
>>> server 10.145.3.71
>> Default server: 10.145.3.71
>> Address: 10.145.3.71#53
>>> 10.145.3.41
>> Server:         10.145.3.71
>> Address:        10.145.3.71#53
>>
>> ** server can't find 41.3.145.10.in-addr.arpa: NXDOMAIN
>>> server 10.145.3.72
>> Default server: 10.145.3.72
>> Address: 10.145.3.72#53
>>> 10.145.3.41
>> Server:         10.145.3.72
>> Address:        10.145.3.72#53
>>
>> ** server can't find 41.3.145.10.in-addr.arpa: NXDOMAIN
>>> server 10.145.1.121
>> Default server: 10.145.1.121
>> Address: 10.145.1.121#53
>>> 10.145.3.41
>> Server:         10.145.1.121
>> Address:        10.145.1.121#53
>>
>> 41.3.145.10.in-addr.arpa        name = opaplnx13.intra.azosp.vr.it.
>>
>> In DNSMasq log I can see:
>> Aug 25 16:21:06 dnsmasq[6373]: query[PTR] 41.3.145.10.in-addr.arpa
>> from 10.145.3.69
>> Aug 25 16:21:06 dnsmasq[6373]: config 10.145.3.41 is NXDOMAIN-IPv4
>>
>> How is it possible? Is there a cache file somewhere?
>
> 1. don't use nslookup for any kind of testing, you often get very strange
> results. Use dig instead, or host. dig for instance will also show the TTL,
> which can be rather useful when dealing with "is this data cached" sort of
> questions.
>
> 2. dnsmasq is a forwarder, and if the upstream server caches the result, then
> dnsmasq will get a cached result.
>
>
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>

Hi there,

 do you know the famous RTFM?
I had bogus-priv option enabled and I'm in a private 10.x.x.x network!

Many thanks for your replies!
Ciaoo
Piero
-- 
Stupid is as stupid does.
Forrest Gump



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