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

"Salz, Rich" <rsalz@akamai.com> Wed, 06 December 2023 15:00 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: Hal Murray <halmurray@sonic.net>
CC: "ntp@ietf.org" <ntp@ietf.org>
Thread-Topic: [Ntp] I-D Action: draft-ietf-ntp-update-registries-09.txt
Thread-Index: AQHaKBIvrdpL0AWnYkCv0c6kgZgzhLCcjAkA
Date: Wed, 06 Dec 2023 15:00:27 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ntp/QtCDUk2AGyalO-Uvqs5YPjK0QN4>
Subject: Re: [Ntp] I-D Action: draft-ietf-ntp-update-registries-09.txt
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> NTPv4 packets may contain a MAC (Message Authentication Code) that appears 
> where you would expect an extension but it does NOT have the type/length 
> header of an extension. RFC 7822 has the details of how MACs can coexist with 
> extensions.

There is already some wording there in section 2.2:

> [RFC7822] clarified the processing rules for Extension Field Types, particularly around
> the interaction with the Message Authentication Code (MAC) field.

Which I updated to merge in your text:

> {{RFC7822}} clarified the processing rules for Extension Field Types,
> particularly around the interaction with the Message Authentication Code
> (MAC) field.  NTPv4 packets may contain a MAC, but it appears where one would
> expect an extension even though it does not have the type/length header of an
> extension.

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