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Network Working Group                               Nirupma Kulshreshtha
INTERNET DRAFT                                               Novell Inc.
                                                           December 1999
                                                       Expires June 2000


                   The Migration Agent List Option for DHCP
                     <draft-ietf-dhc-migagntlist-00.txt>

Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.  Internet-Drafts are working
   documents of the Internet Engineering Task Force (IETF), its areas,
   and its working groups.  Note that other groups may also distribute
   working documents as Internet-Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress".

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt.

   The list of Internet-Drafts Shadow Directories can be accessed at
   http://www.ietf.org/ietf/shadow.html.

   This document is a submission to the Dynamic Host Configuration
   Working Group of the Internet Engineering Task Force (IETF). Comments
   should be submitted to the dhcp-v4@bucknell.edu mailing list.

Abstract

   This document defines a new DHCP option for delivering configuration
   information to hosts utilizing the Compatibility Mode Driver (CMD)
   provided with NovellÆs NetWare 5. This option is passed from the DHCP
   server to the DHCP Client to provide the addresses of one or more
   Migration Agents along with their CMD network number.

Introduction

   The Dynamic Host Configuration Protocol (DHCP)[1] provides a
   framework for passing configuration information to hosts on a TCP/IP
   network. The Compatibility Mode Driver (CMD) provided with NetWare 5
   facilitates smooth migration of networks from IPX and NetWare/IP, to
   Pure IP. This component provides the necessary connectivity for IPX
   Client/Server applications to communicate with nodes that connect to
   the IP internet. It also allows IPX Client/Server applications to run
   on IP Nodes.

   Connectivity between IPX Nodes and IP Nodes is achieved through the
   use of gateways called Migration Agents.



Kulshreshtha                                                    [Page 1]


Internet Draft                                             December 1999


   This document describes a DHCP option that carries addresses of one
   or more Migration Agents along with their CMD Network number. The
   addresses of Migration Agents are required by other Migration Agents
   to discover new IPX Nodes.

Definitions

   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 [3].

   This document also uses the following terms:

      "DHCP client"

           DHCP client or "client" is an Internet host using DHCP to
           obtain configuration parameters such as a network address.

      "DHCP server"

           A DHCP server or "server" is an Internet host that returns
           configuration parameters to DHCP clients.

Migration Agent List Option Format

   The code for this option is TBD. The minimum length specified in the
   æLenÆ field is 8 bytes, and this length MUST be a multiple of 8. This
   option can contain addresses of multiple migration agents along with
   their CMD Network number. The first four bytes specifies the IP
   address (in hexadecimal format) of the Migration Agent, and the next
   four bytes specifies the CMD Network number (in hexadecimal format)
   of the Migration Agent.

   Code  Len  IP Address          CMD Network Number
  +-----+----+----+----+----+----+----+----+----+----+-
  | TBD | 08 | a1 | a2 | a3 | a4 | n1 | n2 | n3 | n4 |
  +-----+----+----+----+----+----+----+----+----+----+-

   In the above example, (0xa1a2a3a4) specifies the IP address of the
   Migration Agent and (0xn1n2n3n4) specifies the CMD Network number of
   the Migration Agent.

DHCP Client Behavior

   The DHCP client will use this option to get the IP addresses of all
   the Migration Agents in the CMD network in which the client is
   present.







Kulshreshtha                                                    [Page 2]


Internet Draft                                             December 1999


Security Considerations

   DHCP currently provides no authentication or security mechanisms.
   Potential exposures to attack are discussed in section 7 of the DHCP
   protocol specification [1]. In particular, these DHCP options allow
   an unauthorized DHCP server to misdirect any client to a non existent
   Migration Agent.

References

   [1] Droms, R., "Dynamic Host Configuration Protocol", RFC 2131, March
        1997.
   [2] Alexander, S. and Droms, R., "DHCP Options and BOOTP Vendor
        Extensions", RFC 2132, March 1997.
   [3] Bradner, S., "Key words for use in RFCs to indicate requirement
        levels", RFC 2119, March 1997.

Author Information

Nirupma Kulshreshtha
Novell Software Development (I) Ltd.
49/1 & 49/3, Garvebhavipalya
7th Mile, Hosur Road,
Bangalore - 560 068. INDIA
Phone: +91(80)572-1856
email: knirupama@novell.com

Expiration

   This document will expire on June 6, 2000.


Full Copyright Statement

   Copyright (C) The Internet Society (1998).  All Rights Reserved.

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   followed, or as required to translate it into languages other than
   English.

   The limited permissions granted above are perpetual and will not be
   revoked by the Internet Society or its successors or assigns.


Kulshreshtha                                                    [Page 3]


Internet Draft                                             December 1999


   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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Kulshreshtha                                                    [Page 4]


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