From owner-freebsd-hackers Tue Jul 17 9:21: 7 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from mgw1.MEIway.com (mgw1.meiway.com [212.73.210.75]) by hub.freebsd.org (Postfix) with ESMTP id 1DBFA37B405 for ; Tue, 17 Jul 2001 09:21:03 -0700 (PDT) (envelope-from LConrad@Go2France.com) Received: from mail.Go2France.com (ms1.meiway.com [212.73.210.73]) by mgw1.MEIway.com (Postfix Relay Hub) with ESMTP id 35F6B16B20 for ; Tue, 17 Jul 2001 18:21:01 +0200 (CEST) Received: from IBM-HIRXKN66F0W.Go2France.com [195.115.185.184] by mail.Go2France.com with ESMTP (SMTPD32-6.06) id A7D07BA90128; Tue, 17 Jul 2001 18:29:04 +0200 Message-Id: <5.1.0.14.0.20010717181833.00bb1eb0@mail.Go2France.com> X-Sender: LConrad@Go2France.com@mail.Go2France.com X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Tue, 17 Jul 2001 18:21:55 +0200 To: freebsd-hackers@freebsd.org From: Len Conrad Subject: Re: Weird named problem - IN A for nameservers being lost! In-Reply-To: <5.1.0.14.0.20010717120221.03aa6ec8@mail.Go2France.com> References: <200107170045.f6H0j8N33016@earth.backplane.com> <5.1.0.14.0.20010622153827.02fa0da0@mail.Go2France.com> <5.1.0.14.0.20010622153827.02fa0da0@mail.Go2France.com> <5.1.0.14.0.20010623185802.04051eb0@mail.Go2France.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1"; format=flowed Content-Transfer-Encoding: 8bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Here´s an explanation from today´s BIND-users traffic: To: comp-protocols-dns-bind@moderators.isc.org Path: not-for-mail From: Barry Margolin Newsgroups: comp.protocols.dns.bind Subject: Re: Am I wrong? References: <9j1i3n$jkv@pub3.rc.vix.com> Organization: Genuity, Cambridge, MA Higher-level servers are only queried if you don't have the NS records for a domain cached. It's possible for a server to have the following records in its cache: cobranetworks.net. 1D IN NS ns1.cobranetworks.net. cobranetworks.net. 1D IN NS ns1.granitecanyon.com. ns1.cobranetworks.net. 1H IN A 195.82.104.220 ns1.granitecanyon.com. 1D IN A 205.166.226.38 An hour later, the ns1.cobranetworks.net A record will be removed from the cache, but the remaining records will still be there. If someone then tries to look up ns1.cobranetworks.net, a recursive query will be sent to ns1.granitecanyon.com. It's not necessary to consult a .net or root server, because we still have a usable NS record for cobranetworks.net. This is why you need to duplicate glue records in the domain itself. -- Barry Margolin, barmar@genuity.net Genuity, Burlington, MA http://MenAndMice.com/DNS-training http://BIND8NT.MEIway.com : ISC BIND 8.2.4 for NT4 & W2K http://IMGate.MEIway.com : Build free, hi-perf, anti-abuse mail gateways To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message