Date: Thu, 21 Jun 2001 20:20:09 +0200 From: Len Conrad <LConrad@Go2France.com> To: freebsd-questions@freebsd.org Subject: Re: Secondary DNS Message-ID: <5.1.0.14.0.20010621201109.03cef988@mail.Go2France.com> In-Reply-To: <20010621180604.39815.qmail@web11701.mail.yahoo.com> References: <Pine.BSF.4.21.0106211412110.13834-100000@cody.jharris.com>
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>Theoretically, if you were to set a random DNS server >(say, your ISPs) as your secondary with the root >servers without actually setting it up as a secondary, >what percentage of the lookups would fail? Not very nice netiquette to sneak in somebody´s NS´s into your delegation records. They´ll get hit with queries for your domain. If they haven´t turned off recursion(dumb), they´ll look up your domain anyway and return an answer, but it won´t be authoritative (from cache) so it won´t be cached by other DNS´s. If they have turned off recursion, then they will give out referrals for your parent zone. >My understanding is that DNS will always try the primary >first There is not such thing as a "primary" from resolvers' POV. All NS´s in the delegation data will be queried equally. The RTT algorithm will cause resolvers to lock on to / prefer one NS until another NS gets a lower RTT. Len 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-questions" in the body of the message
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