Re: DNS primary and secondary receiveing queries at the same time
Hi Roberto, > On 17 May 2018, at 16:25, Roberto Carna wrote: > > 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 downhow do clients know that > they have to query the secondary DNS server at this moment? > > Thanks again. since your servers are Authoritative, clients won’t query them directly, but it’s rather Recursive DNS servers who will do so. If one of your DNS server is unreachable, Recursive servers will try the next one(s). Cheers, Nico > > 2018-05-17 11:19 GMT-03:00 Tony Finch : >> Roberto Carna 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.finchhttp://dotat.at/ >> Hebrides: Southeast 4, veering south 5 or 6, then veering west later. >> Moderate >> or rough. Rain later. Good, occasionally moderate. > ___ > 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 ___ 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
Re: DNS primary and secondary receiveing queries at the same time
On Thu, May 17, 2018 at 4:26 PM Roberto Carna wrote: > 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 downhow do clients know that > they have to query the secondary DNS server at this moment? If they don't get an answer from the first one they try, they will try the next one, and then the next one, etc... W > Thanks again. > 2018-05-17 11:19 GMT-03:00 Tony Finch : > > Roberto Carna 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.finchhttp://dotat.at/ > > Hebrides: Southeast 4, veering south 5 or 6, then veering west later. Moderate > > or rough. Rain later. Good, occasionally moderate. > ___ > 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 -- 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 pants. ---maf ___ 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
Re: DNS primary and secondary receiveing queries at the same time
OK, now I understandthank you very much !!! Regards. 2018-05-17 11:25 GMT-03:00 Roberto Carna : > 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 downhow 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 : >> Roberto Carna 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.finchhttp://dotat.at/ >> Hebrides: Southeast 4, veering south 5 or 6, then veering west later. >> Moderate >> or rough. Rain later. Good, occasionally moderate. ___ 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
Re: DNS primary and secondary receiveing queries at the same time
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 downhow 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 : > Roberto Carna 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.finchhttp://dotat.at/ > Hebrides: Southeast 4, veering south 5 or 6, then veering west later. Moderate > or rough. Rain later. Good, occasionally moderate. ___ 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
Re: DNS primary and secondary receiveing queries at the same time
On Thu, May 17, 2018 at 4:07 PM Roberto Carna wrote: > 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 believedwhen I see the query > log file in primary and secondary DNS servers, I can see queries > coming from Internet in both serversin 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). W > Special thanks !!! > Robert > ___ > 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 -- 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 pants. ---maf ___ 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
Re: DNS primary and secondary receiveing queries at the same time
Dear Nico, my BIND servers are authoritativethey have delegated several zones. 2018-05-17 11:12 GMT-03:00 Nico CARTRON : > Hi Roberto, > > On 17 May 2018, at 16:06, Roberto Carna wrote: > > 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. > > But it seems it is different than I believedwhen I see the query > log file in primary and secondary DNS servers, I can see queries > coming from Internet in both serversin 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 ??? > > > are those servers Authoritative, or Recursive? > It’s not quite clear in your above explanation. > > Cheers, > > -- > Nico > ___ 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
Re: DNS primary and secondary receiveing queries at the same time
Roberto Carna 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.finchhttp://dotat.at/ Hebrides: Southeast 4, veering south 5 or 6, then veering west later. Moderate or rough. Rain later. Good, occasionally moderate. ___ 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
Re: DNS primary and secondary receiveing queries at the same time
Hi Roberto, > On 17 May 2018, at 16:06, Roberto Carna wrote: > > 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. > > But it seems it is different than I believedwhen I see the query > log file in primary and secondary DNS servers, I can see queries > coming from Internet in both serversin 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 ??? are those servers Authoritative, or Recursive? It’s not quite clear in your above explanation. Cheers, -- Nico ___ 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
