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Versions: 00 01 02 03 04 05 RFC 3898

Network Working Group                     Vijayabhaskar A Kalusivalingam
Internet-Draft                                           Hewlett-Packard
Expires: Jun 2004                                               Dec 2003


                  NIS Configuration Options for DHCPv6
                 draft-ietf-dhc-dhcpv6-opt-nisconfig-05

Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

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   This Internet-Draft will expire on Jun 2004.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

Abstract

   This document describes four options for Network Information Service
   (NIS) related configuration information in DHCPv6:  NIS Servers, NIS+
   Servers, NIS Client Domain Name, NIS+ Client Domain name.

1. Introduction

   This document describes four options for passing configuration
   information related to Network Information Service (NIS) [3] in
   DHCPv6 (RFC 3315 [1]).

2. Terminology

   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 RFC2119 [2].




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   Throughout this document, unless otherwise specified, the acronym
   DHCP refers to DHCP as specified in RFC 3315.

   This document uses terminology specific to IPv6 and DHCP as defined
   in section "Terminology" of RFC 3315.

3. Network Information Service (NIS) Servers Option

   The Network Information Service (NIS) Servers option provides a
   list of one or more IPv6 addresses of NIS servers available to the
   client.  Clients MUST treat the list of NIS servers as an ordered
   list.  The server MAY list the NIS servers in the order of
   preference.

   The format of the Network Information Service 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_NIS_SERVERS       |         option-len            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      |                   NIS server (IPv6 address)                   |
      |                                                               |
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      |                   NIS server (IPv6 address)                   |
      |                                                               |
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                              ...                              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   option-code:   OPTION_NIS_SERVERS (tbd)

   option-len: Length of the 'NIS server' fields in octets; It must be
      a multiple of 16

   NIS server:    IPv6 address of NIS server

4. Network Information Service V2 (NIS+) Servers Option

   The Network Information Service V2 (NIS+) Servers option provides
   a list of one or more IPv6 addresses of NIS+ servers available to
   the client.  Clients MUST treat the list of NIS+ servers as an
   ordered list.  The server MAY list the NIS+ servers in the order of
   preference.

   The format of the Network Information Service V2 (NIS+) Servers
   option is as shown 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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |      OPTION_NISP_SERVERS      |         option-len            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      |                   NIS+ server (IPv6 address)                  |
      |                                                               |
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      |                   NIS+ server (IPv6 address)                  |
      |                                                               |
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                              ...                              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   option-code:   OPTION_NISP_SERVERS (tbd)

   option-len: Length of the 'NIS+ server' fields in octets; It must be
      a multiple of 16

   NIS+ server:    IPv6 address of NIS+ server

5.  Network Information Service (NIS) Domain Name Option

    The Network Information Service (NIS) Domain Name option is used
    by the server to convey client's NIS Domain Name info to the
    client.

    The format of the NIS Domain Name 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_NIS_DOMAIN_NAME     |         option-len            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                       nis-domain-name                         |
      |                              ...                              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   option-code:   OPTION_NIS_DOMAIN_NAME (tbd)

   option-len: Length of the 'nis-domain-name' field in octets

   nis-domain-name:   NIS Domain name for client

   The 'nis-domain-name' MUST be encoded as specified in section
   "Representation and Use of domain names" of the DHCPv6
   specification [1].




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6.  Network Information Service V2 (NIS+) Domain Name Option

    The Network Information Service V2 (NIS+) Domain Name option is
    used by the server to convey client's NIS+ Domain Name info to the
    client.

    The format of the NIS+ Domain Name 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_NISP_DOMAIN_NAME    |         option-len            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                       nisp-domain-name                        |
      |                              ...                              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   option-code:   OPTION_NISP_DOMAIN_NAME (tbd)

   option-len: Length of the 'nisp-domain-name' field in octets

   nisp-domain-name:   NIS+ Domain name for client

   The 'nisp-domain-name' MUST be encoded as specified in section
   "Representation and Use of domain names" of the DHCPv6
   specification [1].

7. Appearance of these Options

   The NIS servers, NIS+ servers, NIS domain name and NIS+ domain name
   options MUST NOT appear in other than the following messages: Solicit,
   Advertise, Request, Renew, Rebind, Information-Request and Reply.

   The option number for these options MAY appear in the Option Request
   Option [1] in the following messages: Solicit, Request, Renew,
   Rebind, Information-Request and Reconfigure.

8. Security Considerations

   The NIS servers, NIS+ servers, NIS domain name and NIS+ domain name
   options may be used by an intruder DHCPv6 server to assign invalid
   NIS parameters, resulting in clients unable to use NIS service.

   The NIS servers and NIS+ servers options may be used by an intruder
   DHCPv6 server to cause the DHCPv6 clients to send their queries to an
   intruder NIS/NIS+ server.  This misdirected searches may be used to
   spoof NIS/NIS+ names.

   The NIS domain name and NIS+ domain name options may be used by an
   intruder DHCPv6 server to cause the DHCPv6 clients to search through
   invalid domains for incompletely specified domain names.  The results
   of these misdirected searches may be used to spoof NIS/NIS+ names.




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   To avoid attacks through these options, the DHCPv6 client SHOULD use
   authenticated DHCP (see section "Authentication of DHCP messages" in
   the DHCPv6 specification [1]).

9. IANA Considerations

   IANA is requested to assign an option code to the following options
   from the option-code space defined in "DHCPv6 Options" section of the
   DHCPv6 specification [1].

      Option Name            Value    Described in
   OPTION_NIS_SERVERS         tbd       Section 3
   OPTION_NISP_SERVERS        tbd       Section 4
   OPTION_NIS_DOMAIN_NAME     tbd       Section 5
   OPTION_NISP_DOMAIN_NAME    tbd       Section 6

10. Normative References

   [1]  Bound, J., Carney, M., Perkins, C., Lemon, T., Volz, B. and R.
        Droms (ed.), "Dynamic Host Configuration Protocol for IPv6
        (DHCPv6)", RFC 3315, July 2003.

   [2]  Bradner, S., "Key words for use in RFCs to Indicate Requirement
        Levels", BCP 14, RFC 2119, March 1997.

11. Informative References

   [3]  Sun Microsystems, "System and Network Administration",
        March 1990.

Author's Address

   Vijayabhaskar A Kalusivalingam
   Hewlett-Packard STSD-I
   29, Cunningham Road
   Bangalore - 560052
   India

   Phone: +91-80-2053085
   E-Mail: vijayak@india.hp.com

















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Full Copyright Statement

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph are
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   The limited permissions granted above are perpetual and will not be
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   This document and the information contained herein is provided on an
   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
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   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
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Acknowledgement

   Funding for the RFC Editor function is currently provided by the
   Internet Society. Thanks to the DHC Working Group for their time and
   input into the specification. In particular, thanks to (in
   alphabetical order) Bernie Volz, Jim Bound, Margaret Wasserman, Pekka
   Savola, Ralph Droms and Thomas Narten for their thorough review.























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