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

Simon Kelley simon at thekelleys.org.uk
Tue Aug 25 15:58:33 BST 2009


Piero wrote:
> 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
                                  ^^^^^^^


It's not cached, there's something in your dnsmasq configuration that's 
causing it to answer in that way,

> 
> How is it possible? Is there a cache file somewhere?
> 
No cache file, something in /etc/dnsmasq.conf


Cheers,

Simon.




More information about the Dnsmasq-discuss mailing list