Date: Sat, 29 Jan 2000 21:23:17 +0100 From: sthaug@nethelp.no To: igor@physics.uiuc.edu Cc: mccord@zytek.com, phk@critter.freebsd.dk, sthaug@nethelp.no, fbsd-security@ursine.com, freebsd-security@FreeBSD.ORG Subject: Re: Continual DNS requests from mysterious IP Message-ID: <2806.949177397@verdi.nethelp.no> In-Reply-To: Your message of "Sat, 29 Jan 2000 14:09:45 -0600 (CST)" References: <200001292009.OAA22881@alecto.physics.uiuc.edu>
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> However, the second method seems to provide more desired (?) result: > If you try to send an nslookup request about an outside domain > to the server from an outside host, it will respond as "query refused". > In the first case (using "allow-recursion"), the server will not > refuse the query, but rather will respond with the root-servers information. This is on purpose. The idea of the "allow-recursion" option is to limit the amount of work that a disallowed client can ask from your server. This means that it will either return a referral, or an answer from its cache. But it will *not* perform any new queries on behalf of a disallowed client. The amount of work to return a "query refused" is about the same as that of returning a referral or an answer from the cache. Steinar Haug, Nethelp consulting, sthaug@nethelp.no To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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