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Simple Network Time Protocol (SNTP) Configuration Option for DHCPv6
RFC 4075

Document type: RFC - Proposed Standard (May 2005; No errata)
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 4075 (Proposed Standard)
Responsible AD: Margaret Wasserman
Send notices to: No addresses provided

Network Working Group                                  V. Kalusivalingam
Request for Comments: 4075         Cisco Systems (India) Private Limited
Category: Standards Track                                       May 2005

  Simple Network Time Protocol (SNTP) Configuration Option for DHCPv6

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   This document describes a new DHCPv6 option for passing a list of
   Simple Network Time Protocol (SNTP) server addresses to a client.

1.  Introduction

   This document describes a new option, called the SNTP [3] servers
   option, for passing information about SNTP servers in DHCPv6 [1].

2.  Requirements

   The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,
   SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this
   document, are to be interpreted as described in RFC 2119 [2].

3.  Terminology

   This document uses terminology specific to IPv6 and DHCPv6 as defined
   in the "Terminology" section of the DHCPv6 specification [1].

4.  Simple Network Time Protocol (SNTP) Servers Option

   The Simple Network Time Protocol servers option provides a list of
   one or more IPv6 addresses of SNTP [3] servers available to the
   client for synchronization.  The clients use these SNTP servers to
   synchronize their system time to that of the standard time servers.
   Clients MUST treat the list of SNTP servers as an ordered list.  The
   server MAY list the SNTP servers in decreasing order of preference.

Kalusivalingam              Standards Track                     [Page 1]
RFC 4075          SNTP Configuration Option for DHCPv6          May 2005

   The option defined in this document can only be used to configure
   information about SNTP servers that can be reached using IPv6.  The
   DHCP option to configure information about IPv4 SNTP servers can be
   found in RFC 2132 [4].  Mechanisms for configuring IPv4/IPv6 dual-
   stack applications are being considered, but are not specified in
   this document.

   The format of the Simple Network Time Protocol servers option is as
   shown below:

       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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |      OPTION_SNTP_SERVERS       |        option-len            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      |                  SNTP server (IPv6 address)                   |
      |                                                               |
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      |                  SNTP server (IPv6 address)                   |
      |                                                               |
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                              ...                              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      option-code: OPTION_SNTP_SERVERS (31)

      option-len:  Length of the 'SNTP server' fields, in octets;
                   it must be a multiple of 16

      SNTP server: IPv6 address of SNTP server

5.  Appearance of This Option

   The SNTP servers option MUST NOT appear in messages other than the
   following: Solicit, Advertise, Request, Renew, Rebind, Information-
   Request, and Reply.  If this option appears in messages other than
   those specified above, the receiver SHOULD ignore it.

   The option number for this option MAY appear in the Option Request
   Option [1] in the following messages:  Solicit, Request, Renew,
   Rebind, Information-Request, and Reconfigure.  If this option number
   appears in the Option Request Option in messages other than those
   specified above, the receiver SHOULD ignore it.

Kalusivalingam              Standards Track                     [Page 2]
RFC 4075          SNTP Configuration Option for DHCPv6          May 2005

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