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Re: [Ntp] I-D Action: draft-ietf-ntp-update-registries-09.txt

Hal Murray <halmurray@sonic.net> Mon, 27 November 2023 02:52 UTC

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To: "Salz, Rich" <rsalz=40akamai.com@dmarc.ietf.org>
cc: "ntp@ietf.org" <ntp@ietf.org>, Hal Murray <halmurray@sonic.net>
From: Hal Murray <halmurray@sonic.net>
In-Reply-To: Message from "Salz, Rich" <rsalz=40akamai.com@dmarc.ietf.org> of "Wed, 22 Nov 2023 01:25:41 +0000." <ED05CB35-6EEC-4BE3-9A13-9B8978AA8587@akamai.com>
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Subject: Re: [Ntp] I-D Action: draft-ietf-ntp-update-registries-09.txt
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Could you please save/reserve extensiion Field Type 0x0000?

I don't have a good writeup.  The idea is tangled up with 7822.  The problem 
is how to distinguish an extension from a MAC.

Shared key MACs have a 4 byte key number and 16 or 20 bytes of MAC.  The key 
number space was shared by autokey and manual assignments.  The manual mode 
was restricted to the lower 65K.  So sites that are not using autokey don't 
need the at least 28 byte length restriction from RFC 7822 for the last 
extension.  If the type field is 0, the rest is a MAC rather than an extension.


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