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Re: Last Call: draft-irtf-asrg-dnsbl (DNS Blacklists and Whitelists)

Mark Andrews <Mark_Andrews@isc.org> Mon, 17 November 2008 03:14 UTC

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To: Florian Weimer <fw@deneb.enyo.de>
From: Mark Andrews <Mark_Andrews@isc.org>
Subject: Re: Last Call: draft-irtf-asrg-dnsbl (DNS Blacklists and Whitelists)
In-reply-to: Your message of "Sun, 16 Nov 2008 20:28:35 BST." <87vdunqxlo.fsf@mid.deneb.enyo.de>
Date: Mon, 17 Nov 2008 07:13:10 +1100
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In message <87vdunqxlo.fsf@mid.deneb.enyo.de>, Florian Weimer writes:
> * Mark Andrews:
> 
> > In message <87skpt279z.fsf@mid.deneb.enyo.de>, Florian Weimer writes:
> >> * Stephane Bortzmeyer:
> >> 
> >> > Second question, the document indeed standardizes many things which
> >> > are not in common use but does not point towards a rationale, so some
> >> > choices are puzzling. Why TXT records to point to an URL and not
> >> > NAPTR? Is this because of current usage in DNSxL? If so, this should
> >> > be noted. But why IPv6 lists use a A record and not a AAAA? I am not
> >> > aware of existing IPv6 lists so this cannot be the current usage?
> >> 
> >> The lack of a macro capability also means that it's basically
> >> impossible to secure DNSBL zones with DNSSEC when they contain larger
> >> chunks of address space; see the example in section 2.1.
> >
> > 	How so?
> 
> The expectation is that error messages generated from TXT records
> contain the actual IP addresses which triggered the DNSBL lookups.  As
> a result, if you list a /16 (say), you need publish 65,536 different
> TXT records.
> 
> Currently, these records are synthesized using a macro capability in
> the DNS server.

	Which is independent of DNSSEC.  I ask again how this a
	DNSSEC problem.

	Mark
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews@isc.org
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