DHCP Options for Novell Directory Services
RFC 2241

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Network Working Group                                          D. Provan
Request for Comments: 2241                                  Novell, Inc.
Category: Standards Track                                  November 1997

               DHCP Options for Novell Directory Services

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 (1997).  All Rights Reserved.

Abstract

   This document defines three new DHCP options for delivering
   configuration information to clients of the Novell Directory
   Services. The first option carries a list of NDS servers. The second
   option carries the name of the client's NDS tree. The third carries
   the initial NDS context. These three options provide an NDS client
   with enough information to connect to an NDS tree without manual
   configuration of the client.

1. Introduction

   Novell Directory Services is a distributed, replicated, hierarchical
   database of objects representing network resources such as nodes,
   services, users, and applications. An NDS client must be able to
   locate an NDS server in order to authenticate itself to the network
   and gain access to the database. In addition, the node's user is
   better served if the NDS client's attention is focused on the area of
   the NDS database likely to be of the most interest to the user.  This
   specification describes DHCP options [1] that carry NDS information
   to TCP/IP clients of NDS. The first option, the NDS Servers Option,
   carries a list of NDS servers. The other two options, the NDS Tree
   Name Option and the NDS Context Option, provide the client with a
   default context within the NDS database.

Provan                      Standards Track                     [Page 1]
RFC 2241                     DHCP Options                  November 1997

   The NDS Tree Name Option and the NDS Context Option carry 16-bit
   Unicode text encoded into an octet stream using UTF-8 [4]. A complete
   DHCP implementation can represent of the entire Unicode character set
   supported by NDS. At the same time, 7-bit ASCII text is unchanged by
   the UTF-8 transformation. In environments where the NDS tree name and
   context are restricted to the range of 7-bit ASCII characters, ASCII-
   only DHCP clients and servers can support these options by using the
   ASCII text as the UTF-8 encoded data.

   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. [2]

2. NDS Servers Option

   This option specifies one or more NDS servers for the client to
   contact for access to the NDS database. Servers SHOULD be listed in
   order of preference.

   The code for this option is 85. The minimum length of this option is
   4 octets, and the length MUST be a multiple of 4.

      Code   Len        Address 1               Address 2
     +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+--
     | 85  |  n  |  a1 |  a2 | a3  |  a4 |  a1 |  a2 |  a3 |  a4 |  ...
     +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+--

3. NDS Tree Name Option

   This option specifies the name of the NDS tree the client will be
   contacting. NDS tree names are 16-bit Unicode strings. For
   transmission in the NDS Tree Name Option, an NDS tree name is
   transformed into octets using UTF-8. The string should NOT be zero
   terminated.

   The code for this option is 86. The maximum possible length for this
   option is 255 bytes.

       Code Len  NDS Tree Name
      +----+----+----+----+----+----+--
      | 86 | n  | c1 | c2 | c3 | c4 |  ...
      +----+----+----+----+----+----+--

Provan                      Standards Track                     [Page 2]
RFC 2241                     DHCP Options                  November 1997

4. NDS Context Option

   This option specifies the initial NDS context the client should use.
   NDS contexts are 16-bit Unicode strings. For transmission in the NDS
   Context Option, an NDS context is transformed into octets using UTF-
   8. The string should NOT be zero terminated.

   A single DHCP option can only contain 255 octets. Since an NDS
   context name can be longer than that, this option can appear more
   than once in the DHCP packet. The contents of all NDS Context options
   in the packet should be concatenated as suggested in the DHCP
   specification [3, page 24] to get the complete NDS context. A single
   encoded character could be split between two NDS Context Options.

   The code for this option is 87. The maximum length for each instance