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Re: [dns-privacy] Early port allocation request for dns-over-TLS

"Mankin, Allison" <amankin@verisign.com> Tue, 18 August 2015 18:12 UTC

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From: "Mankin, Allison" <amankin@verisign.com>
To: Joe Touch <touch@isi.edu>, Mark Andrews <marka@isc.org>, "Wessels, Duane" <dwessels@verisign.com>
Thread-Topic: [dns-privacy] Early port allocation request for dns-over-TLS
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Date: Tue, 18 Aug 2015 18:12:28 +0000
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Cc: "dns-privacy@ietf.org" <dns-privacy@ietf.org>, Warren Kumari <warren@kumari.net>
Subject: Re: [dns-privacy] Early port allocation request for dns-over-TLS
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Hi, Joe,

We authors of the TLS draft are in the process of a revision includes just
this.  I¹m told that the DTLS draft will be revised in the near term to
include port-based establishment as well.

Allison

On 8/18/15, 2:03 PM, "dns-privacy on behalf of Joe Touch"
<dns-privacy-bounces@ietf.org on behalf of touch@isi.edu> wrote:

>FWIW, it would be useful if these issues were documented in the draft,
>e.g., in the IANA considerations section.
>
>Joe
>
>On 8/17/2015 6:16 PM, Mark Andrews wrote:
>> In message <ACC0BEF3-BF37-47CB-8188-37EE2AD1E5F4@verisign.com>,
>>"Wessels, Duane
>> " writes:
>>>> On Aug 17, 2015, at 6:42 AM, Warren Kumari <warren@kumari.net> wrote:
>>>>
>>>> On Tue, Aug 11, 2015 at 2:00 PM, Joe Touch <touch@isi.edu> wrote:
>>>>>
>>>>> Hi, Warren,
>>>>>
>>>>> It might be useful to summarize on this list the rationale for this
>>>>> allocation and the plan for its use.
>>>>>
>>>>> In particular:
>>>>>
>>>>>        - why port 53 is not sufficient using STARTTLS
>>>>>
>>>>
>>>> - The WG decided that using a new port instead of a STARTTLS or
>>>> octet-matching would better suite our operational goals.
>>>> We had significant discussions on this, and we have concerns about
>>>> things like middle boxes reacting to non-DNS on 53.
>>>
>>> Additionally:
>>>
>>> - A separate port avoids the 1xRTT incurred by STARTTLS negotiation.
>>>
>>> - DNS-over-DTLS can't use STARTTLS (at least not as currently
>>>described),
>>> although
>>> it does claim that it can run on port 53.  That relies on an unaware
>>> server
>>> mis-interpreting a DTLS ClientHello message as a DNS message with
>>> Opcode=15.  That,
>>> in turn, takes Opcode 15 off the table for future allocation, etc.
>>>
>>>
>>> DW
>> 
>> More correctly DTLS traffic is DNS reply traffic (QR=1) which is
>> why there is no response from DNS servers.  The traffic is processed
>> as a broken unexpected reply.
>> 
>
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