DNS primary and secondary receiveing queries at the same time

Warren Kumari warren at kumari.net
Thu May 17 14:28:24 UTC 2018

On Thu, May 17, 2018 at 4:26 PM Roberto Carna <robertocarna36 at gmail.com>

> Dear Tony, so you say that it's impossible what I want...

> In this scenario that my two DNS servers respond queries at the same
> time, suppose the primary server goes down....how do clients know that
> they have to query the secondary DNS server at this moment?

If they don't get an answer from the first one they try, they will try the
next one, and then the next one, etc...


> Thanks again.

> 2018-05-17 11:19 GMT-03:00 Tony Finch <dot at dotat.at>:
> > Roberto Carna <robertocarna36 at gmail.com> wrote:
> >>
> >> I always believed that all the client queries coming from Internet go
> >> to the DNS primary server, and if it is down, just in this case go to
> >> the DNS secondary server.
> >
> > It can't happen that way because there's no way for a resolver to tell
> > which is which.
> >
> > Tony.
> > --
> > f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
> > Hebrides: Southeast 4, veering south 5 or 6, then veering west later.
> > or rough. Rain later. Good, occasionally moderate.
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I don't think the execution is relevant when it was obviously a bad idea in
the first place.
This is like putting rabid weasels in your pants, and later expressing
regret at having chosen those particular rabid weasels and that pair of

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