Date: Thu, 29 Dec 2011 12:36:10 +0300 From: Peter Andreev <andreev.peter@gmail.com> To: Victor Sudakov <vas@mpeks.tomsk.su> Cc: freebsd-questions@freebsd.org Subject: Re: mutual forwarders in ISC BIND Message-ID: <CAE_wXn03yrQSgnoEjU1SjGLNFdd0E8as8pbnC3hvtUTvuvz3Uw@mail.gmail.com> In-Reply-To: <20111229085842.GA45978@admin.sibptus.tomsk.ru> References: <4EFAE80D.9040900@my.gd> <20111228130734.GA23763@admin.sibptus.tomsk.ru> <4EFB1B4F.2090504@my.gd> <CAE_wXn2qKfQg_Od=VfX63TcvDSRFEz2ZLCDZDs71QjP2604QOQ@mail.gmail.com> <CAE_wXn1DzpxhhN_ASF%2B-LuxRBsdfgA8Se3ydhAgeJs5p53=VPg@mail.gmail.com> <20111228175512.GB27286@admin.sibptus.tomsk.ru> <20111229022538.GA38514@admin.sibptus.tomsk.ru> <CAE_wXn11xkq7ZRj9ouOfwJy=Z1rmsirSaaNRid%2BypayDs1y=aQ@mail.gmail.com> <20111229073817.GB44026@admin.sibptus.tomsk.ru> <CAE_wXn3_2a7=gc%2Bj1coQ0pTbYvAKwZ4QLNgmTFbBpDSxCYZYEg@mail.gmail.com> <20111229085842.GA45978@admin.sibptus.tomsk.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
2011/12/29 Victor Sudakov <vas@mpeks.tomsk.su>: > Peter Andreev wrote: >> >> >> > Victor, we researched this topic and learned that response time = highly >> >> >> > depends on distance between user and resolver, while cache influ= ence >> >> >> > on this value is lesser. >> >> >> > So I advice you to keep all as is. >> >> >> >> >> >> Be it so. Thank you. >> >> > >> >> > And the reason for the whole thread. One of the customers told me t= hat >> >> > 8.8.8.8 is faster than our own DNS servers which are located on the >> >> > same 100 MBit/s LAN with them. I was shocked but it seems true, at >> >> > least for the answers which are not yet cached. >> >> >> >> I don't know what software google uses on its resolvers, but I suppos= e >> >> something with shared or synchronizing cache. May be they also make >> >> preventive lookups on popular domains to fill this cache. And the >> >> reason why 8.8.8.8 seems faster - it answered from cache while your >> >> resolver made full lookup chain. >> > >> > Duh! That is why I started thinking about some cache synchronizing >> > technique for my resolvers. >> >> Preventive lookups can be made via self-written scripts. > > Sure, after query log analysis. > >> >> AFAIK there is no free open source implementations providing cache >> synchronization between different resolvers. > > Unbound cannot do that, can it? It has options "dump-cache" and "load-cache" for debugging purposes, but I don't recommend using it in production. May be "cache-min-ttl" and "cache-max-ttl" would be useful, but I doubt what is better - get fast response or get right response. > > I am surprised. After all, squid siblings are quite common. > > > -- > Victor Sudakov, =A0VAS4-RIPE, VAS47-RIPN > sip:sudakov@sibptus.tomsk.ru > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.o= rg" --=20 -- AP
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAE_wXn03yrQSgnoEjU1SjGLNFdd0E8as8pbnC3hvtUTvuvz3Uw>