Did you have a chance to look at my email below? Thanks again, Joe 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 >> >
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