Network Working Group J. Bound
Internet-Draft Compaq Computer Corporation
Expires: July 2, 2002 M. Carney
Sun Microsystems, Inc.
C. Perkins
Nokia Research Center
T. Lemon
Nominum
B. Volz
Ericsson
R. Droms
Cisco Systems
Jan 2002
DSTM Options for DHCPv6
draft-ietf-dhc-dhcpv6-opt-dstm-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.
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Copyright Notice
Copyright (C) The Internet Society (2002). All Rights Reserved.
Abstract
The DSTM Global IPv4 Address option and the DSTM Tunnel Endpoint
Option provide DSTM (Dual Stack Transition Mechanism) configuration
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information to DHCPv6 hosts.
1. Introduction
This document describes two options for DHCPv6 [2] that provide
information for hosts using the "Dual Stack Transition Mechanism"
(DSTM) [3].
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 [1]
3. Terminology
This document uses terminology specific to IPv6 and DHCPv6 as defined
in section "Terminology" of the DHCPv6 specification.
4. DSTM Global IPv4 Address option
The DSTM Global IPv4 Address option encapsulates other options that a
DHCP client is to use for DSTM. The DSTM Global IPv4 Address option
must include at least one Identity Association (IA) (see section
"Identity Association" of the DHCPv6 specification [2]) that carries
IPv4-mapped IPv6 addresses [4] as used in DSTM.
The format of the DSTM Global IPv4 Address option is:
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_DSTM | option-length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
. .
. options .
. .
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code : OPTION_DSTM
option-length: Length of the 'options' field in octets
options : Options associated with DSTM
One Identity Association option (see section "Identity Association
option" of the DHCPv6 specification) MUST be encapsulated within the
options field in the DSTM Global IPv4 Address option. That IA option
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MUST be used only for IPv4-mapped IPv6 addresses.
A DSTM Tunnel End Point option (Section 5) MAY be encapsulated in the
DSTM Global IPv4 Address option to specify one or more tunnel
endpoints.
5. DSTM Tunnel Endpoint Option
The DSTM Tunnel Endpoint option carries an IP address that is to be
used as a tunnel endpoint (TEP) to encapsulate IP datagrams within
IP.
The format of the DSTM Tunnel Endpoint option is:
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_DSTM_TEP | option-length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
. .
. tep .
. (16 octets) .
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code: OPTION_DSTM_TEP
option-length: 16
tep: Tunnel endpoint
A DSTM Tunnel EndPoint Option MUST NOT be used except when
encapsulated in a DSTM Global IPv4 Address option.
6. Appearance of these options
The DSTM Global IPv4 Address option MUST only appear in the options
section of the following DHCP messages: Solicit, Advertise, Request,
Confirm, Renew, Rebind, Decline, Release, Reply.
The DSTM Tunnel Endpoint option MUST only appear as an encapsulated
option in a DSTM Global IPv4 Address option.
7. Security Considerations
The DSTM Global IPv4 Address option may be used by an intruder DHCP
server to assign an invalid IPv4-mapped address to a DHCP client in a
denial of service attack. The DSTM Tunnel Endpoint option may be
used by an intruder DHCP server to configure a DHCP client with an
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endpoint that would cause the client to route packets through an
intruder system.
To avoid these security hazards, a DHCP client MUST use authenticated
DHCP to confirm that it is exchanging the DSTM options with an
authorized DHCP server.
8. IANA Considerations
IANA is requested to assign an option code to this option from the
option-code space defined in section "DHCP Options" of the DHCPv6
specification [2].
References
[1] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
[2] Bound, J., Carney, M., Perkins, C., Lemon, T., Volz, B. and R.
Droms (ed.), "Dynamic Host Configuration Protocol for IPv6
(DHCPv6)", draft-ietf-dhc-dhcpv6-23 (work in progress), February
2002.
[3] Bound, J., "Dual Stack Transition Mechanism (DSTM)", draft-ietf-
ngtrans-dstm-05 (work in progress), November 2001.
[4] Hinden, R. and S. Deering, "IP Version 6 Addressing
Architecture", RFC 2373, July 1998.
Authors' Addresses
Jim Bound
Compaq Computer Corporation
ZK3-3/W20
110 Spit Brook Road
Nashua, NH 03062-2698
USA
Phone: +1 603 884 0062
EMail: Jim.Bound@compaq.com
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Mike Carney
Sun Microsystems, Inc.
Mail Stop: UMPK17-202
901 San Antonio Road
Palo Alto, CA 94303-4900
USA>
Phone: +1 650 786 4171
EMail: mwc@eng.sun.com
Charlie Perkins
Nokia Research Center
Communications Systems Lab
313 Fairchild Drive
Mountain View, CA 94043
USA
Phone: +1 650 625 2503
EMail: charliep@iprg.nokia.com
Nominum
EMail: mellon@nominum.com
Bernie Volz
Ericsson
959 Concord Street
Framingham, MA 01701
USA
Phone: +1 508 875 3162
EMail: bernie.volz@ericsson.com
Ralph Droms
Cisco Systems
250 Apollo Drive
Chelmsford, MA 01824
USA
Phone: +1 978 497 4733
EMail: rdroms@cisco.com
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