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

2008-11-16 16:35:27
* Mark Andrews:

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.

I didn't say it was a DNSSEC problem.  I just wanted to note it's
impossible to secure some existing DNSBL zones using DNSSEC without
sacrificing some of the functionality which is mentioned in section
2.1 in the draft.
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