Network Time Protocol Extended Information Extension Field
draft-stenn-ntp-extended-information-00

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Last updated 2016-10-24
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Internet Engineering Task Force                                 H. Stenn
Internet-Draft                                   Network Time Foundation
Intended status: Standards Track                        October 24, 2016
Expires: April 27, 2017

       Network Time Protocol Extended Information Extension Field
                draft-stenn-ntp-extended-information-00

Abstract

   The network packet format used by NTP has changed very little between
   NTPv1, defined by RFC 958 [RFC0958] in 1985, and NTPv4, defined by
   RFC 5905 [RFC5905].  The core network packet used by NTP has no spare
   bits available for reporting additinal state information and no
   larger data areas available for larger amounts of information.  This
   proposal offers a new extension field that would contains 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
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

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   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on April 27, 2017.

Copyright Notice

   Copyright (c) 2016 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
   (http://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
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of

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Internet-Draft Network Time Protocol Extended Information   October 2016

   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
   3.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

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
   specification, to make it easier to evolve this specification.

    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          |
   +---------------------------------------------------------------+

                 NTP Extension Field: Extended Information

   Field Type: TBD (Recommendation for IANA: 0x0009 (Extended-
   Information, MAC required), 0x2009 (Extended-Information, MAC

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