DNS primary and secondary receiveing queries at the same time

[Nico CARTRON]

Hi Roberto,

> On 17 May 2018, at 16:25, Roberto Carna <robertocarna36 at gmail.com> wrote:
> 
> 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?
> 
> Thanks again.

since your servers are Authoritative, clients won’t query them directly, but it’s rather Recursive DNS servers who will do so.
If one of your DNS server is unreachable, Recursive servers will try the next one(s).

Cheers,
Nico


> 
> 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. Moderate
>> or rough. Rain later. Good, occasionally moderate.
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