From owner-freebsd-questions@FreeBSD.ORG Thu Dec 29 09:36:12 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 33BAF106564A for ; Thu, 29 Dec 2011 09:36:12 +0000 (UTC) (envelope-from andreev.peter@gmail.com) Received: from mail-ww0-f50.google.com (mail-ww0-f50.google.com [74.125.82.50]) by mx1.freebsd.org (Postfix) with ESMTP id B3ADB8FC19 for ; Thu, 29 Dec 2011 09:36:11 +0000 (UTC) Received: by wgbdr11 with SMTP id dr11so22931919wgb.31 for ; Thu, 29 Dec 2011 01:36:10 -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=yoVy8fGCgNc+kwjjkvR7LIfSJEro8U2M9K1fc/PG/+A=; b=IC0XWP9pmc/2hCLVrBB5kXkuDQn6nylQm9UX2PKGaJn+B73TipHOMH/5+NfXW5eWqD WD0V8cnRvP6u85/fSXZqmGz60pvyzBRwc573IE7aorcOIWgb5XFzABSTf+uwPOiyJoTr N/TZa/AVsD5f4J7O1PmaF7lcDSVhM3f919A/U= MIME-Version: 1.0 Received: by 10.227.204.66 with SMTP id fl2mr34417053wbb.16.1325151370670; Thu, 29 Dec 2011 01:36:10 -0800 (PST) Received: by 10.216.15.77 with HTTP; Thu, 29 Dec 2011 01:36:10 -0800 (PST) In-Reply-To: <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> <20111229085842.GA45978@admin.sibptus.tomsk.ru> Date: Thu, 29 Dec 2011 12:36:10 +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 09:36:12 -0000 2011/12/29 Victor Sudakov : > 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