Date: Sat, 29 Jan 2000 21:30:58 +0100 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: sthaug@nethelp.no Cc: igor@physics.uiuc.edu, mccord@zytek.com, fbsd-security@ursine.com, freebsd-security@FreeBSD.ORG Subject: Re: Continual DNS requests from mysterious IP Message-ID: <14538.949177858@critter.freebsd.dk> In-Reply-To: Your message of "Sat, 29 Jan 2000 21:23:17 %2B0100." <2806.949177397@verdi.nethelp.no>
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In message <2806.949177397@verdi.nethelp.no>, sthaug@nethelp.no writes: >> 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. Yes, but "query refused" might have the advantage of signalling the other end to reconfigure. -- Poul-Henning Kamp FreeBSD coreteam member phk@FreeBSD.ORG "Real hackers run -current on their laptop." FreeBSD -- It will take a long time before progress goes too far! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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