Date: Tue, 17 Jul 2001 18:21:55 +0200 From: Len Conrad <LConrad@Go2France.com> To: freebsd-hackers@freebsd.org Subject: Re: Weird named problem - IN A for nameservers being lost! Message-ID: <5.1.0.14.0.20010717181833.00bb1eb0@mail.Go2France.com> 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>
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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 <barmar@genuity.net> 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
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