DNS primary and secondary receiveing queries at the same time

[Roberto Carna]

OK, now I understand....thank you very much !!!

Regards.

2018-05-17 11:25 GMT-03:00 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?
>
> 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. Moderate
>> or rough. Rain later. Good, occasionally moderate.