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

Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de> Mon, 04 October 2021 07:33 UTC

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Date: Mon, 04 Oct 2021 09:33:14 +0200
From: "Ulrich Windl" <Ulrich.Windl@rz.uni-regensburg.de>
To: "Rich Salz" <rsalz=40akamai.com@dmarc.ietf.org>, <taralx@gmail.com>,<mayer@pdmconsulting.net>
Cc: "Marcus Dansarie" <marcus@dansarie.se>,<watsonbladd@gmail.com>, "ntp@ietf.org" <ntp@ietf.org>
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  >>> "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?

> 
> Any ASN1-based protocol (SNMP, PKIX, etc) has an identifier.