Date: Thu, 29 Dec 2011 14:38:17 +0700 From: Victor Sudakov <vas@mpeks.tomsk.su> To: freebsd-questions@freebsd.org Subject: Re: mutual forwarders in ISC BIND Message-ID: <20111229073817.GB44026@admin.sibptus.tomsk.ru> In-Reply-To: <CAE_wXn11xkq7ZRj9ouOfwJy=Z1rmsirSaaNRid%2BypayDs1y=aQ@mail.gmail.com> References: <20111228075422.GA18064@admin.sibptus.tomsk.ru> <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>
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Peter Andreev wrote: > >> > >> > Victor, we researched this topic and learned that response time highly > >> > depends on distance between user and resolver, while cache influence > >> > 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 that > > 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 suppose > 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. -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN sip:sudakov@sibptus.tomsk.ru
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