Network Time Protocol Extended Information Extension Field
draft-stenn-ntp-extended-information-04

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Last updated 2019-03-25
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Internet Engineering Task Force                                 H. Stenn
Internet-Draft                                   Network Time Foundation
Intended status: Standards Track                          March 25, 2019
Expires: September 26, 2019

       Network Time Protocol Extended Information Extension Field
                draft-stenn-ntp-extended-information-04

Abstract

   RFC EDITOR: PLEASE REMOVE THE FOLLOWING PARAGRAPH BEFORE PUBLISHING:

   The source code and issues list for this draft can be found in
   https://github.com/hstenn/ietf-ntp-extended-information-ef

   The core network packet used by NTP has no spare bits available for
   reporting additional state information and no larger data areas
   available for larger amounts of information.  This proposal offers a
   new extension field that would contain this additional information.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
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   This Internet-Draft will expire on September 26, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect

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Internet-Draft Network Time Protocol Extended Information     March 2019

   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   2.  The Extended Information Extension Field  . . . . . . . . . .   2
     2.1.  Version 0 Content Descriptor and Content Data fields  . .   3
   3.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   The core NTP packet format has changed little since RFC 958 [RFC0958]
   was published in 1985.  Since then, there has been demonstrated need
   to convey additional information about NTP's state in an NTP packet
   but no backward-compatible way to usurp the few otherwise potentially
   available bits has been found, and no larger data areas are available
   in the core packet structure.  This proposal offers a new extension
   field that would contain this additional information.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

2.  The Extended Information Extension Field

   The Field Type of the Extended Information EF includes a version
   number field in the low-order bits of the first octet, to make it
   easier to evolve this specification.  The initial specification for
   this proposal uses Version 0, which equates to 0x0009 [ADJUST AS
   NEEDED BASED ON IANA, IF AN IANA REGISTRY IS USED].  A future
   revision for Version 1 would use 0x0109 [IBID].

   The payload for Version 0 is comprised of a two octet Content
   Descriptor followed by a two octet Content Data field, as described
   below.

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    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +---------------+---------------+-------------------------------+
   |          Field Type           |        Field Length           |
   +-------------------------------+-------------------------------+
   |     Content Descriptor 1      |       Content Data 1          |
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