From owner-freebsd-questions Fri Feb 14 5:59:39 2003 Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id E1DC437B401 for ; Fri, 14 Feb 2003 05:59:37 -0800 (PST) Received: from mail.bellavista.cz (mail.bellavista.cz [62.168.44.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id E912643F93 for ; Fri, 14 Feb 2003 05:59:36 -0800 (PST) (envelope-from neuhauser@bellavista.cz) Received: from freepuppy.bellavista.cz (freepuppy.bellavista.cz [10.0.0.10]) by mail.bellavista.cz (Postfix) with ESMTP id D818F2F9; Fri, 14 Feb 2003 14:59:33 +0100 (CET) Received: by freepuppy.bellavista.cz (Postfix, from userid 1001) id 7DA482FDB30; Fri, 14 Feb 2003 14:59:29 +0100 (CET) Date: Fri, 14 Feb 2003 14:59:29 +0100 From: Roman Neuhauser To: Bjarne Wichmann Petersen Cc: dan@slightlystrange.org, freebsd-questions@FreeBSD.ORG Subject: Re: Resolving or blocking eg. doubleclick.net? Message-ID: <20030214135929.GI81356@freepuppy.bellavista.cz> Mail-Followup-To: Bjarne Wichmann Petersen , dan@slightlystrange.org, freebsd-questions@FreeBSD.ORG References: <200302121029.14713.freebsd.nospam@mekanix.dk> <200302121301.14497.freebsd.nospam@mekanix.dk> <20030212121531.GB60013@catflap.home.slightlystrange.org> <200302121443.38094.freebsd.nospam@mekanix.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200302121443.38094.freebsd.nospam@mekanix.dk> User-Agent: Mutt/1.5.1i Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG # freebsd.nospam@mekanix.dk / 2003-02-12 14:43:37 +0100: > On Wednesday 12 February 2003 13:15, Daniel Bye wrote: > > At a shell prompt, try > > $ time host doubleclick.net > > $ time host dk.doubleclick.net > dk.doubleclick.net mail is handled (pri=10) by relay2.doubleclick.net > dk.doubleclick.net mail is handled (pri=10) by relay1.doubleclick.net > > real 0m0.269s > user 0m0.000s > sys 0m0.005s > > $ time host dk.doubleclick.net > dk.doubleclick.net mail is handled (pri=10) by relay1.doubleclick.net > dk.doubleclick.net mail is handled (pri=10) by relay2.doubleclick.net > > real 0m0.009s > user 0m0.004s > sys 0m0.001s > > So, it's safe to assume my cache is working? ... and perhaps, resolving > doubleclick.net et al isn't the issue? > > But looks like the cache expires after a couple of minutes? That's something you can easily check by trying to resolve the name a couple of minutes later. :) But that would be a lame test, and you wouldn't really know any hard data. This is authoritative: roman@freepuppy ~ 1011:1 > dnsq a doubleclick.net ns2.dcny.doubleclick.net|grep ^answer answer: doubleclick.net 300 A 199.95.206.210 roman@freepuppy ~ 1012:0 > so yes. the A RR for doubleclick.net has TTL of 300 seconds. somewhat stupid if you ask me. I would suggest you to configure your DNS cache so that it forwards queries to your ISP's caches. That'll buy you some time. -- If you cc me or remove the list(s) completely I'll most likely ignore your message. see http://www.eyrie.org./~eagle/faqs/questions.html To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message