DNS primary and secondary receiveing queries at the same time

Warren Kumari warren at kumari.net
Thu May 17 14:23:23 UTC 2018

On Thu, May 17, 2018 at 4:07 PM Roberto Carna <robertocarna36 at gmail.com>

> Hi people, I've implemented two BIND9 servers for my company, one as
> primary public DNS server and the other as secondary public DNS
> server.

> 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.

Nope, you are incorrect -- there isn't really a "primary" and "secondary" -
that is poorly used terminology.
There are "masters" and "slaves" (also poor terminology) - new information
gets published on masters, and the slaves copy and serve that, but both
will get queries.

> But it seems it is different than I believed....when I see the query
> log file in primary and secondary DNS servers, I can see queries
> coming from Internet in both servers....in other words, the two DNS
> servers are being contacted all the time.

> Is there any way to make DNS clients from Internet always contact my
> primary DNS server and just if it is down the clients must contact the
> secondary DNS server ???

Nope. Resolvers will choose between your servers at random (it's not
actually random, but close enough for this discussion).


> Special thanks !!!

> Robert
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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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