Re: [DNSOP] Draft for dynamic discovery of secure resolvers

Tom Pusateri <pusateri@bangj.com> Tue, 21 August 2018 19:40 UTC

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From: Tom Pusateri <pusateri@bangj.com>
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Date: Tue, 21 Aug 2018 15:39:57 -0400
Cc: dnsop WG <dnsop@ietf.org>, Vittorio Bertola <vittorio.bertola@open-xchange.com>, David Conrad <drc@virtualized.org>
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To: Paul Vixie <paul@redbarn.org>
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Subject: Re: [DNSOP] Draft for dynamic discovery of secure resolvers
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> On Aug 21, 2018, at 3:30 PM, Paul Vixie <paul@redbarn.org> wrote:
> 
> this, joyfully, is a very good question.
> 
> Tom Pusateri wrote:
> ....
>> Ok, so as Vladimír said, getting back to DHCP…
>> 
>> 1. You obviously don’t need a DoH URI option for DHCP. 2. You’re
>> comfortable with DNS over UDP/53 as long as DNS Cookies are present
>> and using the existing DHCP DNS options 3. You seem happy with the
>> Android approach of just trying DoT with the IP address learned via
>> standard DHCP DNS options
>> 
>> Why do you care about additional DHCP options?
> 
> in my previous explaination as to the security model i follow, i noted that the network paths to my dhcp server and my rdns servers were different, and that in the dhcp case i have far more observability and control than in the rdns case.
> 
> it should follow therefore that i do NOT want to use UDP/53 + Cookies unless there is no alternative. DoT will be preferred. (DTLS or SCTP would be even better, but i'm only picking from items now-on-menu.)

Since you can already do DoT today without an additional DHCP DNS option and adding that option will indisputably also come with a DoH URI option too, I would think you would be arguing against any new DHCP options for consistency.

Tom