From owner-freebsd-questions@FreeBSD.ORG Thu Dec 29 08:58:46 2011 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 7FAED106564A for ; Thu, 29 Dec 2011 08:58:46 +0000 (UTC) (envelope-from vas@mpeks.tomsk.su) Received: from relay2.tomsk.ru (relay2.tomsk.ru [212.73.124.8]) by mx1.freebsd.org (Postfix) with ESMTP id BAE058FC12 for ; Thu, 29 Dec 2011 08:58:45 +0000 (UTC) X-Virus-Scanned: by clamd daemon 0.93.1 for FreeBSD at relay2.tomsk.ru Received: from admin.sibptus.tomsk.ru (account sudakov@sibptus.tomsk.ru [212.73.125.240] verified) by relay2.tomsk.ru (CommuniGate Pro SMTP 5.1.13) with ESMTPSA id 22953479 for freebsd-questions@freebsd.org; Thu, 29 Dec 2011 15:58:43 +0700 Received: from admin.sibptus.tomsk.ru (sudakov@localhost [127.0.0.1]) by admin.sibptus.tomsk.ru (8.14.5/8.14.5) with ESMTP id pBT8wg8F046017 for ; Thu, 29 Dec 2011 15:58:43 +0700 (NOVT) (envelope-from vas@mpeks.tomsk.su) Received: (from sudakov@localhost) by admin.sibptus.tomsk.ru (8.14.5/8.14.5/Submit) id pBT8wg97046016 for freebsd-questions@freebsd.org; Thu, 29 Dec 2011 15:58:42 +0700 (NOVT) (envelope-from vas@mpeks.tomsk.su) X-Authentication-Warning: admin.sibptus.tomsk.ru: sudakov set sender to vas@mpeks.tomsk.su using -f Date: Thu, 29 Dec 2011 15:58:42 +0700 From: Victor Sudakov To: freebsd-questions@freebsd.org Message-ID: <20111229085842.GA45978@admin.sibptus.tomsk.ru> References: <4EFAE80D.9040900@my.gd> <20111228130734.GA23763@admin.sibptus.tomsk.ru> <4EFB1B4F.2090504@my.gd> <20111228175512.GB27286@admin.sibptus.tomsk.ru> <20111229022538.GA38514@admin.sibptus.tomsk.ru> <20111229073817.GB44026@admin.sibptus.tomsk.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Organization: AO "Svyaztransneft", SibPTUS X-PGP-Key: http://www.livejournal.com/pubkey.bml?user=victor_sudakov X-PGP-Fingerprint: 10E3 1171 1273 E007 C2E9 3532 0DA4 F259 9B5E C634 User-Agent: Mutt/1.5.21 (2010-09-15) Subject: Re: mutual forwarders in ISC BIND X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Dec 2011 08:58:46 -0000 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. > > 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? I am surprised. After all, squid siblings are quite common. -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN sip:sudakov@sibptus.tomsk.ru