From owner-freebsd-questions Thu Jun 21 11:19:19 2001 Delivered-To: freebsd-questions@freebsd.org Received: from mgw1.MEIway.com (mgw1.meiway.com [212.73.210.75]) by hub.freebsd.org (Postfix) with ESMTP id AB4CC37B407 for ; Thu, 21 Jun 2001 11:19:16 -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 33F2E16B13 for ; Thu, 21 Jun 2001 20:39:31 +0200 (CEST) Received: from IBM-HIRXKN66F0W.Go2France.com [195.115.185.184] by mail.Go2France.com with ESMTP (SMTPD32-6.06) id AC4ACEEE0124; Thu, 21 Jun 2001 20:26:18 +0200 Message-Id: <5.1.0.14.0.20010621201109.03cef988@mail.Go2France.com> X-Sender: LConrad@Go2France.com@mail.Go2France.com X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Thu, 21 Jun 2001 20:20:09 +0200 To: freebsd-questions@freebsd.org From: Len Conrad Subject: Re: Secondary DNS In-Reply-To: <20010621180604.39815.qmail@web11701.mail.yahoo.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1"; format=flowed Content-Transfer-Encoding: 8bit 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 >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