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 (<robertocarn...@gmail.com>) escribió: > 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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