draft-stenn-ntp-extension-fields-07.txt   draft-stenn-ntp-extension-fields-08.txt 
Internet Engineering Task Force H. Stenn Internet Engineering Task Force H. Stenn
Internet-Draft D. Mills Internet-Draft D. Mills
Obsoletes: 7822 (if approved) Network Time Foundation Obsoletes: 7822 (if approved) Network Time Foundation
Intended status: Standards Track August 30, 2018 Intended status: Standards Track October 2, 2018
Expires: March 3, 2019 Expires: April 5, 2019
Network Time Protocol Version 4 (NTPv4) Extension Fields Network Time Protocol Version 4 (NTPv4) Extension Fields
draft-stenn-ntp-extension-fields-07 draft-stenn-ntp-extension-fields-08
Abstract Abstract
Network Time Protocol version 4 (NTPv4) defines the optional usage of Network Time Protocol version 4 (NTPv4) defines the optional usage of
extension fields. An extension field, as defined in RFC 5905 extension fields. An extension field, as defined in RFC 5905
[RFC5905] and RFC 5906 [RFC5906], resides after the end of the NTP [RFC5905] and RFC 5906 [RFC5906], resides after the end of the NTP
header and supplies optional capabilities or information that cannot header and supplies optional capabilities or information that cannot
be conveyed in the basic NTP packet. This document updates RFC 5905 be conveyed in the basic NTP packet. This document updates RFC 5905
[RFC5905] by clarifying some points regarding NTP extension fields [RFC5905] by clarifying some points regarding NTP extension fields
and their usage with legacy Message Authentication Codes (MACs), and and their usage with legacy Message Authentication Codes (MACs), and
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This Internet-Draft will expire on March 3, 2019. This Internet-Draft will expire on April 5, 2019.
Copyright Notice Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
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publication of this document. Please review these documents publication of this document. Please review these documents
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+---------------+---------------+-------------------------------+ +---------------+---------------+-------------------------------+
|R|E| Code | Type | (Field Length) | |R|E| Code | Type | (Field Length) |
+-------------------------------+-------------------------------+ +-------------------------------+-------------------------------+
Extension Field Header Format Extension Field Header Format
Where the following Field Type flags are defined: Where the following Field Type flags are defined:
R: 0 for a "Query", 1 for a "Response" R: 0 for "Information/Query", 1 for a "Response"
E: 0 for "OK", 1 for an "Error". Unused, and will be deprecated. E: 0 for "OK", 1 for an "Error". Unused, and will be deprecated.
[The 'R' flag is currently used by Autokey, and by the proposed I-DO [The 'R' flag is currently used by Autokey, and by the proposed I-DO
extension field. This flag is used after the packet is accepted.] extension field. This flag is used after the packet is accepted.]
[The 'E' flag was proposed for use by Autokey, after the packet was [The 'E' flag was proposed for use by Autokey, after the packet was
accepted. As it was never used and no other use-cases have been accepted. As it was never used and no other use-cases have been
identified, we are recommending this flag be deprecated at some point identified, we are recommending this flag be deprecated at some point
in the future.] in the future.]
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+---------------+---------------+ +---------------+---------------+
|R|E| Code | Type | |R|E| Code | Type |
+-------------------------------+ +-------------------------------+
NTP Extension Field Type Format NTP Extension Field Type Format
Where the following Field Type flags are defined: Where the following Field Type flags are defined:
R: 0 for a "Query", 1 for a "Response" R: 0 for "Information/Query", 1 for a "Response"
E: 0 for "OK", 1 for an "Error". Unused, and will be deprecated. E: 0 for "OK", 1 for an "Error". Unused, and will be deprecated.
+------------+----------------------------------------------+ +------------+----------------------------------------------+
| Field Type | Meaning | | Field Type | Meaning |
+------------+----------------------------------------------+ +------------+----------------------------------------------+
| 0x0000 | crypto-NAK (with Field Length of 0) | | 0x0000 | crypto-NAK (with Field Length of 0) |
| 0x0000 | RESERVED: Permanently Unassigned | | 0x0000 | RESERVED: Permanently Unassigned |
| 0x0001 | RESERVED: Unassigned | | 0x0001 | RESERVED: Unassigned |
| 0x0002 | Autokey: No-Operation Request | | 0x0002 | Autokey: No-Operation Request |
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