[Dnsmasq-discuss] Intermitent DNS failures
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 (126.96.36.199) 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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> Dnsmasq-discuss at lists.thekelleys.org.uk
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