[Dnsmasq-discuss] Intermitent DNS failures

Simon Kelley simon at thekelleys.org.uk
Wed Dec 18 13:32:16 GMT 2013

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 ( and see if that fixes things?



> 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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