In our case, the forwarders are the authoritative servers (the request is for a local domain). For my test I do a request for this local domain. But other requests for external domains may interfere on the RTT calculation. Is there a way for this local resolutions to be processed by local forwarders? I don't find a way to do this....
-----Message d'origine----- De : Mark Andrews <ma...@isc.org> Envoyé : samedi 23 août 2025 22:55 À : DEMBLANS Mathieu <demblan...@numihfrance.fr> Cc : bind-users@lists.isc.org Objet : Re: forwarders order It is smoothed RTT. Forwarders however have highly variable RTT as the records usually needs to be looked up from the authoritative servers so what you end up measuring is RTT + resolution time. RRsets expire at the same time on both the local caching server and the forwarders. > On 21 Aug 2025, at 22:07, DEMBLANS Mathieu <demblan...@numihfrance.fr> wrote: > > Hello, > Anyone know how forwarder is choosen when there is several configured ? > Threads about this subject I found talk about RTT but we doesn’t observe > these. > It looks more like a round robin. > I have tested the response time of the forwarders, our 2 locals servers > respond in 2ms, the 2 others, that are remote, respond in 14ms but if I check > the DNS traffic between the NS requested and the forwarders contacted I have > a 26/26/23/23% repartition, 26% for remotes forwarders. > We use bind 9.18.24 > Any idea about how it should work? > -- > Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe > from this list > > ISC funds the development of this software with paid support subscriptions. > Contact us at https://www.isc.org/contact/ for more information. > > > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org -- Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
