Re: [Ntp] Antw: [EXT] Re: Danny's Review (was Re: draft‑ietf‑ntp‑roughtime‑05: tag change makes implementation more complex)

Danny Mayer <mayer@pdmconsulting.net> Mon, 04 October 2021 14:53 UTC

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To: Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>, Rich Salz <rsalz=40akamai.com@dmarc.ietf.org>, taralx@gmail.com
Cc: watsonbladd@gmail.com, "ntp@ietf.org" <ntp@ietf.org>, Marcus Dansarie <marcus@dansarie.se>
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From: Danny Mayer <mayer@pdmconsulting.net>
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Date: Mon, 4 Oct 2021 10:53:04 -0400
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Subject: Re: [Ntp] =?utf-8?q?Antw=3A_=5BEXT=5D_Re=3A_Danny=27s_Review_=28was_?= =?utf-8?b?UmU6IGRyYWZ04oCRaWV0ZuKAkW50cOKAkXJvdWdodGltZeKAkTA1OiB0YWcg?= =?utf-8?q?change_makes_implementation_more_complex=29?=
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On 10/4/21 3:33 AM, Ulrich Windl wrote:
>    >>> "Salz, Rich" <rsalz=40akamai.com@dmarc.ietf.org> schrieb am 29.09.2021 um
> 17:30
> in Nachricht <14983DF9-548C-4AE7-9AC6-8506745DE183@akamai.com>om>:
>> *   Can you point to an existing RFC where the protocol name is in the
>> header? Is there something useful about it that the security folks think it
>> would be a good addition? Any other references to make sense of this?
>>
>> Does ALPN count?  It’s a protocol identifier in the TLS clientHello message.
>>   There’s lots of ALPN identifiers picked,
>>
> https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-v
>
>> alues.xhtml#alpn-protocol-ids
>>
>> For HTTP, the h2 identifier when connecting over TCP.
> Would SMTP count also?
>
I don't think that the string "SMTP" appears anywhere in the exchange. 
"MAIL" does but that's not what we are talking about.

Danny