In article <mailman.0.1542618692.716.bind-us...@lists.isc.org>, József Lázár <jozsef.gabor.la...@gmail.com> wrote:
> Did you have a chance to look at my email below? Thanks again, Joe Have you tried googling "bind smoothed round trip time"? > > On Tue, 13 Nov 2018 at 10:42, József Lázár <jozsef.gabor.la...@gmail.com> > wrote: > > > Ok, I see. However, could you please specify this "time to time" period? > > Does it depends of the dns traffic which the bind receives? > > I've tried the following scenario: > > Configured two dns forwarders, both of them worked at the beginning. After > > one minute I turned off the first dns forwarder and after an another minute > > I restarted it. > > Then I sent one dns request to bind in every 1,5 second for over one hour, > > but the first dns server didn't receive any request after the restart. > > > > Thanks, Joe > > > > On Sun, 11 Nov 2018 at 15:06, Matus UHLAR - fantomas <uh...@fantomas.sk> > > wrote: > > > >> On 10.11.18 15:59, József Lázár wrote: > >> >I'm wondering what the selection logic in bind for forwarders. I tried to > >> >look for this information in the official documentation but couldn't find > >> >it. Could you please describe it for me briefly? > >> > > >> >Actually, the scenario is that I have two DNS servers and I'm using bind > >> to > >> >forward only the incoming DNS requests and if the "primary" one is failed > >> >for a short period of time then the bind will try to use the "secondary" > >> >one, but when the "primary" comes back, then it doesn't try to connect to > >> >it at all, only if the connection breaks for the "secondary" server. > >> > > >> >Is there any way to configure this logic somehow? > >> > >> No. BIND technically choses server that responds faster. If one of servers > >> doesn't respond (it's down), BIND uses the another one. However, time to > >> time, BIND rechecks the other server(s) to see if situation has changed. > >> > >> BIND does not differ between servers as primary and secondary. > >> > >> -- > >> Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/ > >> Warning: I wish NOT to receive e-mail advertising to this address. > >> Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu. > >> They that can give up essential liberty to obtain a little temporary > >> safety deserve neither liberty nor safety. -- Benjamin Franklin, 1759 > >> _______________________________________________ > >> 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 > >> > > -- Barry Margolin Arlington, MA
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