Network Working Group Myung-Ki Shin Internet-Draft
Yong-Jin KimETRI Expires: AugustDecember 2002 ETRI FebruaryJune 2002 DSTM Ports Option for DHCPv6 draft-ietf-dhc-dhcpv6-opt-dstm-ports-00.txtdraft-ietf-dhc-dhcpv6-opt-dstm-ports-01.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 docu- ments at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in pro- gress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on August 2002. Copyright Notice Copyright (C) The Internet Society (2002). All Rights Reserved. Abstract The DSTM Ports Option provideprovides DSTM (Dual Stack Transition Mechanism) configuration information to DHCPv6 hosts. 1. Introduction This document describes the Ports Option for DHCPv6  that provide information for hosts using the "Dual Stack Transition Mechanism" (DSTM) . 2. Requirements 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. 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 a DSTM Global IPv4 Address option.an IA_DSTM option . 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 the DSTM Global IPv4 Addressan IA_DSTM option  to specify the port range associted with the IPv4- mappedIPv4-mapped IPv6 address. A DSTM Ports option MUST NOT be used except when encapsulated in a DSTM Global IPv4 Address option.an IA_DSTM option . 5. Appearance of these options The DSTM Ports option MUST only appear in the options section of the following DHCP messages: Solicit, Advertise, Request, Confirm, Renew, Rebind, Decline, Release, Reply. The DSTM Ports option MUST only appearas an encapsulated option in a DSTM Global IPv4 Address option.an IA_DSTM option . 6. Security Considerations The DSTM Ports option may be used by an intruder DHCP server to 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 . References  Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.  Bound, J., Carney, M., Perkins, C., Lemon, T., Volz, B. and R. Droms (ed.), "Dynamic Host Configuration Protocol for IPv6 (DHCPv6)", draft-ietf-dhc-dhcpv6-23draft-ietf-dhc-dhcpv6-26 (work in progress), FebruaryJune 2002.  Bound, J., "Dual Stack Transition Mechanism (DSTM)", draft-ietf- ngtrans-dstm-06ngtrans-dstm-07 (work in progress), Feburary 2002.  Hinden, R. and S. Deering, "IP Version 6 Addressing Architecture", RFC 2373, July 1998.  Bound, J.Volz, B. et al., "DSTM Options for DHCPv6", draft-ietf-dhc- dhcpv6-opt-dstm-00.txt,draft-ietf-dhc-dhcpv6- opt-dstm-01.txt, (work in progress), FebruaryApril 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 : firstname.lastname@example.org Yong-Jin Kim ETRI PEC 161 Kajong-Dong, Yusong-Gu, Taejon 305-350, Korea Tel : +82 42 860 6564 Fax : +82 42 861 5404 E-mail : email@example.comFull Copyright Statement Copyright (C) The Internet Society (2002). All Rights Reserved. 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