Network Time Protocol Version 4 Extension Fields
RFC 7822, “Network Time Protocol Version 4 Extension Fields”, is a Proposed Standard document published in March 2016 by T. Mizrahi, D. Mayer. It updates RFC 5905. It has since been updated by RFC 9748. The canonical text is published by the RFC Editor.
Abstract
The Network Time Protocol version 4 (NTPv4) defines the optional usage of extension fields. An extension field, as defined in RFC 5905, is an optional field that resides at the end of the NTP header and that can be used to add optional capabilities or additional information that is not conveyed in the standard NTP header. This document updates RFC 5905 by clarifying some points regarding NTP extension fields and their usage with Message Authentication Codes (MACs).
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 7822 is hosted at rfc-editor.org. Available in TXT,HTML.
- RFC 7821 UDP Checksum Complement in the Network Time Protocol
- RFC 7823 Performance-Based Path Selection for Explicitly Routed Label Switched Paths Using TE Metric Extensions
- RFC 7820 UDP Checksum Complement in the One-Way Active Measurement Protocol and Two-Way Active Measurement Protocol
- RFC 7824 Privacy Considerations for DHCPv6
- RFC 7819 Privacy Considerations for DHCP
- RFC 7825 A Network Address Translator Traversal Mechanism for Media Controlled by the Real-Time Streaming Protocol
- RFC 7818 URN Namespace for MEF Documents
- RFC 7826 Real-Time Streaming Protocol Version 2.0