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Re: [DNSOP] Second Working Group Last Call: draft-ietf-dnsop-refuse-any

Tony Finch <dot@dotat.at> Fri, 17 March 2017 19:38 UTC

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Date: Fri, 17 Mar 2017 19:38:29 +0000
From: Tony Finch <dot@dotat.at>
To: Doug Barton <dougb@dougbarton.us>
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Subject: Re: [DNSOP] Second Working Group Last Call: draft-ietf-dnsop-refuse-any
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Doug Barton <dougb@dougbarton.us> wrote:

> I think this is a bad idea generally, and that RRL is a better solution to the
> amplification vector issue.

RRL and minimal-any address different problems.

My servers have been using RRL for many years and it works very nicely at
dealing with spoofed UDP attacks directed at my auth servers.

I implemented and deployed minimal-any to reduce TCP overload problems.
If many legitimate recursive servers are being abused as amplifiers, using
a name hosted by my authoritative servers, my auth servers can get
overloaded with too much TCP traffic.

With minimal-any, the recursive servers get answers over UDP, populate
their caches, and go away happy.

Cloudflare's reason for deploying minimal-any is also unrelated to RRL. On
their servers it is very expensive to assemble an ANY response. It is much
simpler and cheaper for them to satisfy queries with a synthetic response
than waste effort on a traditional full-fat answer.

Tony.
-- 
f.anthony.n.finch  <dot@dotat.at>  http://dotat.at/  -  I xn--zr8h punycode
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