DNS queries go to primary and secondary DNS servers at the same time

Roberto Carna robertocarna36 at gmail.com
Mon Dec 16 19:20:41 UTC 2019

I add something interesting:

If I execute the same query with dig:

$ dig <some_fqdn>

The query traffic goes only tu DNS1 and not to DNS2.

Maybe a host command problem ???

Thanks again !!!

El lun., 16 dic. 2019 a las 16:13, Roberto Carna (<robertocarna36 at gmail.com>)

> Hi people,
> I have a primary and a secondary BIND9 DNS servers, working as master /
> slave with zone transfers between them.
> I have several Linux machines (desktops and servers) with Debian and Mint.
> I've realized, using TCPDUMP at DNS1 and DNS2, that all DNS queries from
> Linux machines go to both DNS1 and DNS2 BIND servers at the same time.
> In all Linux machines we have setup the DNS resolution using
> /etc/resolv.conf:
> nameserver IP_dns1
> nameserver IP_dns2
> But when the from Linux clients I execute:
> $ host <some_fqdn>
> I can see UDP traffic arriving to DNS1 and DNS2 at the same time.
> What can be the problem ? Because I expect only DNS traffic going to DNS1
> because it is before DNS2 in /etc/resolv.conf.
> Thanks a lot !!!
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