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Re: [DNSOP] draft-ietf-dnsop-no-response-issue-03

Tony Finch <dot@dotat.at> Thu, 25 August 2016 16:24 UTC

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Date: Thu, 25 Aug 2016 17:23:59 +0100
From: Tony Finch <dot@dotat.at>
To: william manning <chinese.apricot@gmail.com>
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Subject: Re: [DNSOP] draft-ietf-dnsop-no-response-issue-03
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william manning <chinese.apricot@gmail.com> wrote:

> On Thursday, 25 August 2016, Tony Finch <dot@dotat.at> wrote:
>
> > william manning <chinese.apricot@gmail.com <javascript:;>> wrote:
> >
> > > I'm with Ed here,  A valid response is silence.
> >
> > I think it is important for people producing and deploying DNS server
> > software and DNS-interfering middleboxes to understand the bad
> > consequences of dropping queries or responses. If you understand these
> > effects and still think you can improve things by dropping packets, then
> > maybe go ahead. But it isn't a simple valid / invalid binary choice.
>
> Where does the "badness" occur? The server or resolver?

Both. The resolver suffers extra latency; the server suffers extra traffic
- even a well-behaved resolver has to retry in this situation.

> The rational for a server to silently ignore a query often revolves
> around malformed queries ...  Should a server attempt to answer
> malformed queries or silently drop them?

See section 7 of the draft. It would be reasonable to rate-limit
responses.

This kind of nuance is what this draft should discuss.

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