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[Ntp] MAC and Extension fields

"Salz, Rich" <rsalz@akamai.com> Fri, 15 December 2023 20:14 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: "ntp@ietf.org" <ntp@ietf.org>
Thread-Topic: MAC and Extension fields
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Date: Fri, 15 Dec 2023 20:13:48 +0000
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Subject: [Ntp] MAC and Extension fields
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Is this text, in the current version of the draft, correct? If not, please post a rewrite here. Otherwise I’ll ask the Chairs for consensus on it in 2024.

[RFC7822<file:///Users/rsalz/git/draft-ietf-ntp-update-registries/draft-ietf-ntp-update-registries.html#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 with an extension ID of zero and a length of zero. This document adds a registration for the ID, below.

The table entry:
  Field type | meaning | reference

0x0000  |  Cryptographic MAC

|  RFC 5905, This RFC

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