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

Paul Wouters <paul@nohats.ca> Mon, 20 March 2017 17:54 UTC

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Date: Mon, 20 Mar 2017 13:53:19 -0400
From: Paul Wouters <paul@nohats.ca>
To: Tony Finch <dot@dotat.at>
cc: dnsop <dnsop@ietf.org>
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Subject: Re: [DNSOP] Second Working Group Last Call: draft-ietf-dnsop-refuse-any
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On Mon, 20 Mar 2017, Tony Finch wrote:

> 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

Then clearly the section could use some clarification text :)

Paul

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