Date: Mon, 24 May 1999 21:19:45 +0200 From: sthaug@nethelp.no To: billf@chc-chimes.com Cc: freebsd-isp@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG Subject: Re: Command: host -l domain.com Message-ID: <36974.927573585@verdi.nethelp.no> In-Reply-To: Your message of "Mon, 24 May 1999 10:36:12 -0400 (EDT)" References: <Pine.HPP.3.96.990524103502.13465C-100000@hp9000.chc-chimes.com>
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> > But when i do host -l mydomain.com > > it lists everything... > > Is this something in named i can edit to not list? > > Security through obscurity is a really bad idea. What is so precious about > your DNS records that you can't share. Normally I agree. However, I have seen several examples of the following happening in rapid succession: - Downloading the zone file for a TLD (in this case .no). - Using this info to attempt to download the zone files for *all* the subdomains of the TLD. - Using info from these zone files to launch attacks (for instance against the name servers themselves). As one of the persons responsible for the .no domain, I have concluded that the only sensible course for me is to allow zone transfers only to secondaries and to other "well known" sites that I trust not to have evil intentions. Of course, this will not stop a determined attacker - but it *will* slow down or stop a lot of the script kiddies. Good enough for me. Steinar Haug, Nethelp consulting, sthaug@nethelp.no To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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