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Re: [DNSOP] Root server tar pitting? Is there a better way?

bert hubert <bert.hubert@netherlabs.nl> Mon, 16 May 2016 21:45 UTC

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Date: Mon, 16 May 2016 23:45:07 +0200
From: bert hubert <bert.hubert@netherlabs.nl>
To: "Wessels, Duane" <dwessels@verisign.com>
Message-ID: <20160516214507.GA28128@server.ds9a.nl>
References: <44FFEAA9-7579-47E9-A5AF-5C0E1B720634@opendns.com> <29A70833-47CA-4371-8150-9C7AB16A0877@verisign.com>
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Cc: "dnsop@ietf.org" <dnsop@ietf.org>, Brian Somers <bsomers@opendns.com>
Subject: Re: [DNSOP] Root server tar pitting? Is there a better way?
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On Mon, May 16, 2016 at 09:34:17PM +0000, Wessels, Duane wrote:
> Hi Brian,
> 
> I think what you're suggesting has already been proposed.  See https://datatracker.ietf.org/doc/draft-fujiwara-dnsop-nsec-aggressiveuse/ and https://datatracker.ietf.org/doc/draft-wkumari-dnsop-cheese-shop/

It is in fact something you can do today. Some of the largest PowerDNS
Recursor sites in the world run with 'root-nx-trust' enabled:

"If set, an NXDOMAIN from the root-servers will serve as a blanket NXDOMAIN
for the entire TLD the query belonged to. The effect of this is far fewer
queries to the root-servers."

This after f-root had enabled RRL slightly too aggressively on some nodes.

We just tested this setting against the "owned Ubiquity" attack and after a
thousand queries or so traffic to the roots dropped off to almost zero.

        Bert

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