dhc Working Group Mayumi Yanagiya Internet Draft NTT Expires: August 14,2005 February 14, 2005 IA type for Mobile IPv6 bootstrapping draft-yanagiya-iatype-mip6boot-00.txt Status of this Memo By submitting this Internet-Draft, I certify that any applicable patent or other IPR claims of which I am aware have been disclosed, and any of which I become aware will be disclosed, in accordance with RFC 3668. 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-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on August 14, 2005. Copyright Notice Copyright (C) The Internet Society (2005). All Rights Reserved. Abstract When we use DHCPv6 to bootstrap Mobile IPv6 service, stateful DHCP should be used to assign the home address. In [RFC3315], two types of IA are specified: IA_NA and IA_TA. When stateful DHCPv6 is used in a local network, the "care-of address" is carried as one of the IA_NA options. On the other hand, when autoconfiguration [FRC2462] is used, care-of address is generated on mobile node and there is no way to assign home address stateful. Thus, we introduce a new IA type to assign the home address. Yanagiya Expires - August 14.2005 [Page 1] Internet Draft IA type for Mobile IPv6 bootstrapping May 20.2005 In this document we specify a new IA type for assigning the home address. We describe DHCP options for assigning Mobile IPv6 bootstrapping information such as the home address and home agentĘs address. Table of Contents 1. Introduction..................................................2 2. Terminology...................................................2 3. Background....................................................2 4. IA type and DHCP options for Mobile IPv6 bootstrapping.........3 4.1. IA type for home address assignment......................3 4.2. IA_Home Option...........................................3 4.3. IA Home Address Option.....................................4 4.4. IA Home Agent Address Option...............................5 5. Security considerations........................................5 6. IANA considerations............................................6 7. Informative references........................................6 Author's address..................................................6 1. Introduction When we use DHCPv6 to bootstrap Mobile IPv6 service, stateful DHCP should be used to assign the home address. In [RFC3315], two types of IA are specified: IA_NA and IA_TA. When stateful DHCPv6 is used in a local network, the "care-of address" is carried as one of the IA_NA options. On the other hand, when autoconfiguration [FRC2462] is used, care-of address is generated on mobile node and there is no way to assign home address stateful. Thus, we introduce a new IA type to assign the home address. In this document we specify a new IA type for assigning the home address. We describe DHCP options for assigning Mobile IPv6 bootstrapping information such as the home address and home agentĘs address. 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[1]. Most of terms used in this draft are defined in Mobile IPv6[MIP6] and RFC3315[RFC3315], RFC3633[RFC3633]. 3. Background In [RFC3315], two types of IA are specified for assigning the address: IA_NA and IA_TA. When a mobile node is in a network where Yanagiya Expires - August 14.2005 [Page 2] Internet Draft IA type for Mobile IPv6 bootstrapping May 20.2005 stateful DHCPv6 is used to assign the address (care-of address for the mobile node), the mobile node can use the IA address option to obtain the care-of address. The DHCP server may assign the home address as one of the IAaddr-options. In that case, some issues should be considered. o For mobile node handoff to another attachment point, the mobile node may use DHCP to obtain the new care-of address. At this time, the mobile node has to change home address and home agent. o The DHCPv6 server cannot maintain the state of the home address explicitly. o When DHCP is used in the home network, the mobile node can be assigned the home address by means of several different options. On the other hand, when IPv6 address autoconfiguration is used in a local network, there is no IA type for obtaining home address. 4. IA type and DHCP options for Mobile IPv6 bootstrapping 4.1. IA type for home address assignment We introduce a new IA type to assign home network parameters such as the home address and the IP address of the home agent. This IA type is called IA_Home. 4.2. IA_Home Option The IA_Home option is used to carry the parameters that are used in the home network. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | IA_Home | option-len | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | IAID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | T1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | T2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | : IA_Home-options : | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ option-code OPTION_IA_Home (TBD). option-len 12 + length of IA_Home-options field. Yanagiya Expires - August 14.2005 [Page 3] Internet Draft IA type for Mobile IPv6 bootstrapping May 20.2005 IAID The unique identifier for this IA_Home; the IAID must be unique among the identifiers for all of this client's IA_Home options. The number space for IA_Home IAIDs is separate from the number space for IA_TA IAIDs and IA_NA IAIDs. T1 The time at which the client contacts the server from which the address in the IA_Home was obtained to extend the lifetimes of the address assigned to the IA_Home; T1 is a time duration relative to the current time expressed in units of seconds. T2 The time at which the client contacts any available server to extend the lifetimes of the addresses assigned to IA_Home; T2 is a time duration relative to the current time expressed in units of seconds. IA_Home-options Options associated with this IA_Home. 4.3. IA Home Address Option The IA_Home_Address option is used to assign the home IPv6 address associated with an IA_Home. The IA_Home_Address option must be encapsulated in the IA_Home-options field of an IA_Home option. The IA_HoA-options field encapsulates those options that are specific to the home address. The format of the IA Home 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_HoA | option-len | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | | Home address(IPv6 address) | | | | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | preferred-lifetime | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | valid-lifetime | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ . . . IA HoA-options . . . +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Yanagiya Expires - August 14.2005 [Page 4] Internet Draft IA type for Mobile IPv6 bootstrapping May 20.2005 option-code OPTION_HoA (TBD) option-len 24 + length of IA HoA-options field. Home address A home address (IPv6 address). preferred-lifetime The preferred lifetime for the home address in the option, expressed in units of seconds. valid-lifetime The valid lifetime for the home address in the option, expressed in units of seconds. IA HoA-options Options associated with home address. 4.4. IA Home Agent Address Option The IA Home Agent Address Option is sent by a server to a client to assign the IPv6 address of the home agent (HA) to the mobile node. The IA_Home_Agent_Address option is encapsulated in the IA HoA- options field. The format of the Preference 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_IA_HAaddr | option-len | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | | IPv6 address of HA | | | | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ option-code OPTION_IA_HAaddr.(TBD) option-len 16. IPv6 address of HA The IP address of the home agent with which the mobile node should register the Binding update. 5. Security considerations Secure delivery of the home agentĘs address and the home address from a DHCP server to the mobile node (DHCP client) relies on the overall DHCP security. The particular option defined in this draft does not have any additional impact on DHCP security. Yanagiya Expires - August 14.2005 [Page 5] Internet Draft IA type for Mobile IPv6 bootstrapping May 20.2005 6. IANA considerations This document introduces new DHCPv6 options and a new IA type. The type numbers for option-code are currently TBD. An appropriate request will be made to IANA if this Internet draft gets accepted as an RFC. 7. Informative references [MIP6]D.Johnson et al, "Mobility Support in IPv6",RFC3775, June 2004 [RFC3315]R.Dorms Ed, "Dynamic Host Configuration Protocol for IPv6 (DHCPv6) ", July 2003 [I-D.draft-ohba-mip6-boot-arch-dhcp] Y.Ohba, M.Yanagiya, et al. "Mobile IPv6 Bootstrapping Architecture Using DHCP", draft-ohba-mip6- boot-arch-dhcp-00, October 17, 2004 [RFC2462]S. Thomson, T. Narten, "IPv6 Stateless Address Autoconfiguration",RFC2462,December 1998 Author's address Mayumi Yanagiya NTT Network Service Systems Laboratories 3-9-11 Midori-cho, Musashino-shi Tokyo, Japan Phone: 81-422-596783 Email: yanagiya.mayumi@lab.ntt.co.jp Intellectual Property The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the IETF's procedures with respect to rights in IETF Documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. Yanagiya Expires - August 14.2005 [Page 6] Internet Draft IA type for Mobile IPv6 bootstrapping May 20.2005 The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf- ipr@ietf.org. Disclaimer of Validity This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Copyright Statement Copyright (C) The Internet Society (2005). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. Acknowledgment Funding for the RFC Editor function is currently provided by the Internet Society. Yanagiya Expires - August 14.2005 [Page 7]