Re: [Doh] [Ext] Servers offering responses for domaines they are not responsible for

Paul Hoffman <paul.hoffman@icann.org> Mon, 06 November 2017 00:21 UTC

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From: Paul Hoffman <paul.hoffman@icann.org>
To: "doh@ietf.org" <doh@ietf.org>
CC: Mark Nottingham <mnot@mnot.net>, Eliot Lear <lear@cisco.com>
Thread-Topic: [Ext] [Doh] Servers offering responses for domaines they are not responsible for
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Date: Mon, 6 Nov 2017 00:21:51 +0000
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Subject: Re: [Doh] [Ext] Servers offering responses for domaines they are not responsible for
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On Nov 5, 2017, at 4:15 PM, Mark Nottingham <mnot@mnot.net> wrote:
> 
> I'd think the remedy here would be RFC7871 (EDNS client subnet) support.
> 
>> On 5 Nov 2017, at 0:30, Eliot Lear wrote:
>> 
>>> * When an HTTP server offers this service for domains it is not
>>>   responsible for, it has the potential to impact DNS-based load
>>>   balancing by masking the IP address of the sender and substituting
>>>   its own.  The remedy here is that any service offering DoH should
>>>   sufficiently distributed as to minimize such an impact.

Client Subnet is fairly controversial in the DNS world due to privacy reasons.

In fact, I don't understand Eliot's concern here. DNS recursive resolvers (which is what a DOH server would be fronting for) are not "responsible for domains". Authoritative servers are responsible for domains.

Eliot: can you say more about your concern here?

--Paul Hoffman