Better a correct answer slowly than an incorrect answer quickly.
For the existing PSL, it is not just the accuracy of the document itself, but also the accuracy of the parsing process. Is there a well-trusted parser floating around? DF From: dmarc [mailto:dmarc-boun...@ietf.org] On Behalf Of Dave Crocker Sent: Tuesday, November 24, 2020 1:19 PM To: dmarc@ietf.org Subject: Re: [dmarc-ietf] Doing a tree walk rather than PSL lookup On 11/24/2020 9:21 AM, John Levine wrote: With the tree walk, I was thinking that if the tree walk finds a _dmarc record, that acts as the organizational domain, so finance.acme.example can only allow alignment with itself or its descendants. This is different from the way that OD works now, but the questions are is it worse, and what will break if we do it. Let's consider some attributes, starting with a trivial initial set... Accuracy: How accurate is the data that gets retrieved? Reliability: How likely is it that a query will complete successfully? Latency: How long does it take for a query to complete? Vulnerability: How easily/likely is it that the service can be compromised? Scaling: How well does it operate, at Internet scale? PSL Tree-Walk Accuracy: Known problematic 100% Reliability: High Mixed Latency: None Potentially high Vulnerability: Generally none DOS Scaling: Poor admin, good ops Good admin, potentially poor ops d/ -- Dave Crocker dcroc...@gmail.com 408.329.0791 Volunteer, Silicon Valley Chapter American Red Cross dave.crock...@redcross.org
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