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

Tony Finch <dot@dotat.at> Mon, 20 March 2017 17:40 UTC

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Date: Mon, 20 Mar 2017 17:39:56 +0000
From: Tony Finch <dot@dotat.at>
To: Paul Wouters <paul@nohats.ca>
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Subject: Re: [DNSOP] Second Working Group Last Call: draft-ietf-dnsop-refuse-any
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Paul Wouters <paul@nohats.ca> wrote:
>
> At section 4, item 3, it could give advise based on source-verified
> transport, so that ANY queries received over TCP or with DNS-COOKIES
> could include more data then potentially spoofed UDP packets. But perhaps
> that is not worth it, because ANY queries shouldn't really be used by
> applications, and humans will likely use dig without tcp or cookies
> enabled. So I am fine with the current text as well. But I think it
> would be cleaner if we no longer refer to UDP and TCP when we really
> mean "source IP verified transport" when we say that.

The important distinction for me really is TCP vs UDP - I want to avoid
sending fragmented or truncated UDP responses to legitimate clients.
(Spoofing attacks are handled by RRL, not minimal-any.)
https://www.ietf.org/mail-archive/web/dnsop/current/msg19609.html
https://www.ietf.org/mail-archive/web/dnsop/current/msg19631.html

Tony.
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