[dns-operations] Getting rid of ISP's recursive DNS servers? (Was:Eircom "DNS Attacks" ?

George Barwood george.barwood at blueyonder.co.uk
Sun Jul 19 20:49:03 UTC 2009

Query repetition is an effective solution to blind spoofing.

I made a resolver that does this, it's at


This is the only implementation as yet, to my knowledge.

The theory is described in  section 3.1 of this (now expired) internet draft


I might add that I have abandoned section 3.4 (random nonce), as there are a 
few corner cases
that make it difficult to implement successfully, but query repetition works 


----- Original Message ----- 
From: "Stephane Bortzmeyer" <bortzmeyer at nic.fr>
To: <dns-operations at mail.dns-oarc.net>
Sent: Saturday, July 18, 2009 10:23 PM
Subject: [dns-operations] Getting rid of ISP's recursive DNS servers? 
(Was:Eircom "DNS Attacks" ?

> On Fri, Jul 17, 2009 at 11:17:22AM -0400,
> Keith Mitchell <keith at isc.org> wrote
> a message of 13 lines which said:
>> I'm seeing ongoing coverage of this:
> An interesting point of view (Paul Jakma is a known BGP guru):
> http://pjakma.wordpress.com/2009/07/15/sharing-dns-caches-considered-harmful/
> I wonder what do the root name server operators think about his
> suggestion?
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> dns-operations at lists.dns-oarc.net
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