From owner-freebsd-questions@FreeBSD.ORG Thu Dec 29 08:26:19 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 2A420106564A for ; Thu, 29 Dec 2011 08:26:19 +0000 (UTC) (envelope-from andreev.peter@gmail.com) Received: from mail-wi0-f182.google.com (mail-wi0-f182.google.com [209.85.212.182]) by mx1.freebsd.org (Postfix) with ESMTP id A3B748FC18 for ; Thu, 29 Dec 2011 08:26:18 +0000 (UTC) Received: by wibhr1 with SMTP id hr1so11760212wib.13 for ; Thu, 29 Dec 2011 00:26:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=8vDdga8ToOkrFkjugvFMOqHUfv4dkmPt5Wj7GC7HYso=; b=jsRWLx4RO5s+V8oEg0et2KDAVnDqzUivjlNokInwh2WX6O5Vduf2fhCMrf0QA10xsA rc9hJr6UFJnUyGHwnl/Asar0LLqKUYYaQH/oj992B4ChrT77dT9HisTOreZ4vP51VraL nvoL2oJ8U1NdbT4Nq7jEYfq0M/PDDeupKdrSY= MIME-Version: 1.0 Received: by 10.180.78.101 with SMTP id a5mr19899430wix.19.1325147177559; Thu, 29 Dec 2011 00:26:17 -0800 (PST) Received: by 10.216.15.77 with HTTP; Thu, 29 Dec 2011 00:26:17 -0800 (PST) In-Reply-To: <20111229073817.GB44026@admin.sibptus.tomsk.ru> References: <20111228075422.GA18064@admin.sibptus.tomsk.ru> <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> Date: Thu, 29 Dec 2011 11:26:17 +0300 Message-ID: From: Peter Andreev To: Victor Sudakov Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: freebsd-questions@freebsd.org 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 08:26:19 -0000 2011/12/29 Victor Sudakov : > Peter Andreev wrote: >> >> >> >> > Victor, we researched this topic and learned that response time hig= hly >> >> > depends on distance between user and resolver, while cache influenc= e >> >> > 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. AFAIK there is no free open source implementations providing cache synchronization between different resolvers. > > -- > 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