Network Working Group J. Bharatia Internet-Draft Nortel Networks Expires: December 3, 2006 K. Chowdhury Starent Networks Jun 2006 Mobile IPv6 Extension for Configuration Options draft-bharatia-mip6-gen-ext-00.txt Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. 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 December 3, 2006. Copyright Notice Copyright (C) The Internet Society (2006). Abstract This document describes the mechanism for providing the host configuration information during Mobile IPv6 Binding Update procedure. The Configuration Options extension may be included in the Mobile IPv6 Binding Update message for requesting the home agent to include configuration parameters needed for network service usage (e.g. DNS). The requested information is provided by the Home Agent in one or more Configuration Options extensions. Bharatia & Chowdhury Expires December 3, 2006 [Page 1] Internet-Draft Jun 2006 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Glossary of Terms . . . . . . . . . . . . . . . . . . . . 3 1.2. Conventions used in this document . . . . . . . . . . . . 3 2. Configuration Options Extension . . . . . . . . . . . . . . . 4 3. Processing of Configuration Options . . . . . . . . . . . . . 6 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9 5. Security Considerations . . . . . . . . . . . . . . . . . . . 10 6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 11 Intellectual Property and Copyright Statements . . . . . . . . . . 12 Bharatia & Chowdhury Expires December 3, 2006 [Page 2] Internet-Draft Jun 2006 1. Introduction Currently, there is no mechanism defined for the dynamic configuration of the interface parameters in [RFC3775]. This information is available to the Mobile Node either by manual configuration or it can be obtained by some other means like the use of DHCP. The proposed extension in this document enables carrying the interface parameters essential for the dynamic configuration at the Mobile Node. In this proposal, the configuration parameters are assigned by the Home Agent and this information is passed to the Mobile Node after successful Mobile IPv6 Binding Update procedure. This mechanism is more generic and does not rely on the use of any specific link layer. Note that the scope of this document is to emphasize on the mechanism by which the configuration information is relayed to the Mobile Node. It does not include discussion of how this configuration information is obtained by the Home Agent. 1.1. Glossary of Terms DNS - Domain Name System [RFC1035] DHCPv6 - Dynamic Host Configuration Protocol for IPv6 [RFC3315] 1.2. Conventions used in this document 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]. Bharatia & Chowdhury Expires December 3, 2006 [Page 3] Internet-Draft Jun 2006 2. Configuration Options Extension The following Figure 1 shows the format of the Configuration Options extension. This extension may be included in the Mobile IPv6 Binding Update or Mobile IPv6 Binding Acknowledgement by the Mobile Agents, the Mobile Node and the Home Agent respectively. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Sub-Type | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Config-Data +-+-+-+-+-+-+-... Figure 1: Message Format Type IPV6-CONF-OPTIONS-EXT-TYPE. This extension value will be assigned by IANA from the numbering space defined for Mobile IPv6 Binding Acknowledgement Sub-Options in [RFC3775]. Length Indicates the length (in bytes) of the data field within this Extension. The length does NOT include the Type and Length bytes. This field MUST be set to 2 plus the total length of the Config-Data field. Sub-Type At this time the following values are defined: 0: Reserved. 1: DHCP Options. All other values are reserved for future use. Config-Data The configuration parameters are packed in DHCP-based formats in the Config-Data field. Since the size of the Config-Data field is limited to 253 bytes, the Mobility Agent needs to add multiple extensions with this subtype when the configuration information exceeds the boundary. The DHCP option must be Bharatia & Chowdhury Expires December 3, 2006 [Page 4] Internet-Draft Jun 2006 contained within one extension and never split up across multiple extensions. Bharatia & Chowdhury Expires December 3, 2006 [Page 5] Internet-Draft Jun 2006 3. Processing of Configuration Options This draft provides a mechanism to convey configuration information from the Home Agent to the Mobile Node. The Mobile Node may request values for specific configuration parameters from the Home Agent by including a "Parameter Request List" option in the Mobile IPv6 Binding Update. The list of requested parameters list is specified as a string of octets, describing the DHCPv6 opcodes. The DHCPv6 is defined in [RFC3315]. If this extension is included in the Mobile IPv6 Binding Update, the Home Agent should provide the value of requested information in the Mobile IPv6 Binding Acknowledgement. If there is no Configuration Option extension in the Mobile IPv6 Binding Update, it is up to the the Home Agent to decide which configuration parameter(s) to include in the Configuration Options extension. The Configuration Options extension must appear prior to any authentication extensions added by the Mobile Node in the Mobile IPv6 Binding Update and also by the Home Agent in the Mobile IPv6 Binding Acknowledgement. Mobile Home Node Agent | | |<----Router Advertisement-----| 1 | | |-----Binding Update---------->| 2 | (w/ Configuration Options) | | | |<--Binding Acknowledgement----| 3 | (w/ Configuration Options) | | | Figure 2: Exchanges of Configuration Information The message flow of the solution is shown in Figure 2. Upon successful Mobile IPv6 Binding Update, the Home Agent may append requested configuration information in the Binding Acknowledgement using the Configuration Options extention. The following are the steps involved in the exchange of the Configuration Options extension: Bharatia & Chowdhury Expires December 3, 2006 [Page 6] Internet-Draft Jun 2006 1. As per procedure defined in [RFC3775], the Router Advertisement is sent to the Mobile Node. 2. The Mobile Node sends a Binding Update to the Home Agent. Optionally, the Configuration Options extension (discussed in Section 2) is included by the Mobile Node with the "Parameter Request List" option. In this case, it is recommended that the Mobile Node should set `A' bit in the Binding Update message requesting the Binding Acknowledgement from the Home Agent. 3. The Home Agent appends Mobile IPv6 Binding Acknowledgement with the Configuration Options (discussed in Section 2) for the requested configuration options. Example: Mobile Node wants to obtain the DNS servers' IPv6 addresses [RFC3646] and NIS servers' IPv6 address [RFC3898] from its Home Agent during registration. The Binding Update contains the following values in the Configuration Options Exchange Extension: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | =10 | =1 | =0 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | =6 | =4 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |=23 |= 27 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 3: Example Requested Configuration Parameters The Home Agent responds back to the Mobile Node with a Binding Acknowledgement including the following values in the Configuration Options Exchange Extension. Bharatia & Chowdhury Expires December 3, 2006 [Page 7] Internet-Draft Jun 2006 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | =42 | =1 | =0 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | =23 | =16 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | | DNS-recursive-name-server (IPv6 address) | | | | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | =27 | =16 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | | NIS server (IPv6 address) | | | | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 4: Example Configuration Values in Response Bharatia & Chowdhury Expires December 3, 2006 [Page 8] Internet-Draft Jun 2006 4. IANA Considerations This draft defines a new Mobile IPv6 Sub-Options of type IPV6-CONF- OPTIONS-EXT-TYPE as defined in Section 2 of this document. The value will be defined by IANA from the numbering space of Binding Acknowledgement Sub-Options defined in [RFC3775]. Bharatia & Chowdhury Expires December 3, 2006 [Page 9] Internet-Draft Jun 2006 5. Security Considerations There are no additional security aspects imposed in this document in addition to the one defined in [RFC3775]. 6. References [RFC1035] Mockapetris, P., "Domain names - implementation and specification", STD 13, RFC 1035, November 1987. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC3315] Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C., and M. Carney, "Dynamic Host Configuration Protocol for IPv6 (DHCPv6)", RFC 3315, July 2003. [RFC3646] Droms, R., "DNS Configuration options for Dynamic Host Configuration Protocol for IPv6 (DHCPv6)", RFC 3646, December 2003. [RFC3775] Johnson, D., Perkins, C., and J. Arkko, "Mobility Support in IPv6", RFC 3775, June 2004. [RFC3898] Kalusivalingam, V., "Network Information Service (NIS) Configuration Options for Dynamic Host Configuration Protocol for IPv6 (DHCPv6)", RFC 3898, October 2004. Bharatia & Chowdhury Expires December 3, 2006 [Page 10] Internet-Draft Jun 2006 Authors' Addresses Jayshree Bharatia Nortel Networks 2221, Lakeside Blvd Richardson, TX 75082 Phone: +1 972-684-5767 Email: jayshree@nortelnetworks.com Kuntal Chowdhury Starent Networks 30 International Place Tewksbury, MA 01876 Phone: +1 214-550-1416 Email: kchowdhury@starentnetworks.com Bharatia & Chowdhury Expires December 3, 2006 [Page 11] Internet-Draft Jun 2006 Intellectual Property Statement 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 procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. 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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 (2006). 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. Bharatia & Chowdhury Expires December 3, 2006 [Page 12]