[Dnsmasq-discuss] Intermitent DNS failures

[ion.beguiristain]

I feel a bit embarrassed but it turns out it was a dodgy switch after 
all. Sorry for that, and thanks a lot Simon.
On 12/18/2013 02:32 PM, Simon Kelley wrote:
> On 18/12/13 09:30, ion.beguiristain wrote:
>> Hi everyone, I'm Ion a network admin who is having a bit of trouble with
>> dnsmasq. I'm running dnsmasq 2.59-4 on a x86_64 Ubuntu server 12.04.3 
>> LTS.
>> It has been working fine for a long time but couple of days ago it
>> started intermitently failing to resolve queries. I have added
>> log-queries to the config, but I can't see a single failed query in the
>> logs. Although when you try to access any web it fails half of the time.
>> It gets specially bad when trying to resolve internal hostnames or
>> websites urls.
>> When it resolves something it takes over 10 seconds. Can this be a bug
>> in 2.59-4?
>
> There are none known that would cause that problem. My immediate 
> suspicion would be the external nameservers. Can you try configuring 
> dnsmasq to forwward to Google DNS (8.8.8.8) and see if that fixes things?
>
>
> Cheers,
>
> Simon.
>
>>
>> I also read about dnsmasq setting the DF bit (Don't fragment), but
>> tracepath revealed a 1500 bytes pmtu, so I don't think that is the
>> problem. I would appreciatte any clues as to how to troubleshoot or
>> solve further. Thanks alot for your time.
>>
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>>
>
>
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