OK, thanks a lot for your comments. I'll investigate this topic.
Greetings !!! El mar., 17 dic. 2019 a las 14:42, Chuck Aurora (<c...@nodns4.us>) escribió: > On 2019-12-16 13:13, Roberto Carna wrote: > > I have a primary and a secondary BIND9 DNS servers, working as master > > / slave with zone transfers between them. > > Primary/master and secondary/slave are concepts which apply only to > authoritative servers, and in this case you are talking about these > servers acting as resolvers, not authoritative. > > > 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: > > And resolv.conf is not an ISC BIND thing. In GNU/Linux it's usually > GNU glibc which uses that file. > > > 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 ? > > I'm not sure I would see that as a problem, although you might want to > simplify and use only a single resolver IP address. If your site is > big enough to need two or more resolvers, use an anycast address. For > example, Google's 8.8.8.8 is a large farm of nameservers distributed > throughout the world. > > > Because I expect only DNS traffic going to > > DNS1 because it is before DNS2 in /etc/resolv.conf. > > GNU glibc does have documentation, starting with the resolv.conf(5) > manual. I'm not sure if there is a specific mailing list or forum to > discuss it, however. > _______________________________________________ > Please visit https://lists.isc.org/mailman/listinfo/bind-users to > unsubscribe from this list > > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users >
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