Network Working Group Myung-Ki Shin
Internet-Draft ETRI
Expires: December 2002 June 2002
DSTM Ports Option for DHCPv6
draft-ietf-dhc-dhcpv6-opt-dstm-ports-01.txt
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Copyright Notice
Copyright (C) The Internet Society (2002). All Rights Reserved.
Abstract
The DSTM Ports Option provides DSTM (Dual Stack Transition
Mechanism) configuration information to DHCPv6 hosts.
1. Introduction
This document describes the Ports Option for DHCPv6 [2] that
provide information for hosts using the "Dual Stack Transition
Mechanism" (DSTM) [3].
2. Requirements
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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 [1].
3. Terminology
This document uses terminology specific to IPv6 and DHCPv6 as
defined in section "Terminology" of the DHCPv6 specification.
4. DSTM Ports Option
The DSTM Ports option carries a port range that is to be used for
the associated IPv4-mapped IPv6 address in an IA_DSTM option [5].
The format of the DSTM Ports 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_PORTS | option-length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| start port | end port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code: OPTION_DSTM_PORTS (TBD)
option-length: 4
start port: The start port number for the associated IPv4-
mapped IPv6 address.
end port: The end port number for the associated IPv4-
mapped IPv6 address.
A DSTM Ports option MAY be encapsulated in an IA_DSTM option [5] to
specify the port range associted with the IPv4-mapped IPv6 address.
A DSTM Ports option MUST NOT be used except when encapsulated in an
IA_DSTM option [5].
5. Appearance of these options
The DSTM Ports option MUST only appear as an encapsulated option in
an IA_DSTM option [5].
6. Security Considerations
The DSTM Ports option may be used by an intruder DHCP server to
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assign an invalid port range to a DHCP client in a denial of
service attack.
To avoid this security hazard, a DHCP client MUST use authenticated
DHCP to confirm that it is exchanging the DSTM options with an
authorized DHCP server.
7. IANA Considerations
IANA is requested to assign an option code to this option from the
option-code space defined in section "DHCP Option" 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-dhcpv6-26 (work in progress), June 2002.
[3] Bound, J., "Dual Stack Transition Mechanism (DSTM)", draft-ietf-
ngtrans-dstm-07 (work in progress), Feburary 2002.
[4] Hinden, R. and S. Deering, "IP Version 6 Addressing Architecture",
RFC 2373, July 1998.
[5] Volz, B. et al., "DSTM Options for DHCPv6", draft-ietf-dhc-dhcpv6-
opt-dstm-01.txt, (work in progress), April 2002.
Authors' Addresses
Myung-Ki Shin
ETRI PEC
161 Kajong-Dong, Yusong-Gu, Taejon 305-350, Korea
Tel : +82 42 860 4847
Fax : +82 42 861 5404
E-mail : mkshin@pec.etri.re.kr
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Acknowledgement
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