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Re: [public-dns-discuss] Empty answers for A-queries of ukit.com



The names mentioned appear to be resolving correctly with Google Public DNS now.

Is this still a problem on your end?

On Mon, Feb 4, 2019 at 1:17 PM <opiumfor AT gmail.com> wrote:
>
> We have a three nameservers ns1.ukit.com ns2.ukit.com and ns3.ukit.com.
> The software is PowerDNS 4.1.5 packed into docker containers, the network ports are exposed via docker-proxy (not "--net=host").
> The backend for the PowerDNS is "remote", and it interacts with our self-made restful service which serves records from MongoDB.
>
> The problem is that Google's public DNS sometimes returns our SOA record for the queries of A-records, like there is no A-record at all. In result our websites are becoming inaccessible at random time from random locations across the world, according to reports from host-tracker.com (a geo-spread monitoring service) our users also have reported us about theese problems with availability of their sites. We also could get these empty anwers ourselves quering 8.8.8.8 and 8.8.4.4 (approximately 1 from 10 attempts), while other public DNS services seemed not to encountered the same, we tried 1.1.1.1 and 77.88.8.8.
>
> The questions are:
>
> - Why Google's public DNS does so?
> - Are there any special requirements for authoritative DNS-servers to be operable normally via Google's public DNS? E.g. response time, answers format etc.
> - Is there a way to check compatibility with Google's public DNS ourselves, apart from listed here https://developers.google.com/speed/public-dns/docs/troubleshooting?

That is our recommended approach.

>
>
> Additional info:
>
> The date and time you encountered the problem
> Started from 01.30.2019 15-00 UTC.
>
> Your location
> ns1 - Moscow, Russia
> ns2 - Ashburn, USA
> ns3 - Amsterdam, Netherlands
>
> The platform on which you are noticing the problem (e.g. Mac, Windows, router, etc.)
> I think it doesn't depend on platform
>
> The hostname(s) for which you are having a problem
> ukit.com, ulanding.io, divly.ru (actually there are some more).
>
> Whether the problem is continuous or intermittent
> I'd say it's continiously intermittent.
>
> The links to the tools' name server diagnosis report page
> https://intodns.com/ukit.com
> https://intodns.com/divly.ru
> https://intodns.com/ulanding.io
>
> https://www.host-tracker.com/ru/InstantCheck/3/ec227f42-5825-e911-85b2-0003ff73517a/
>
> The output of the commands you ran in the diagnostic tests
>
> http://prntscr.com/mf75m7
> http://prntscr.com/mf760v
> http://prntscr.com/mf76fl
>
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