Network Working Group F. Templin Internet-Draft Nokia Expires: May 25, 2004 November 25, 2003 Operation of the NOID Multihoming Protocol on ISATAP Nodes draft-templin-isnoid-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 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 May 25, 2004. Copyright Notice Copyright (C) The Internet Society (2003). All Rights Reserved. Abstract This document describes the operation of the NOID multihoming proposal on nodes with ISATAP interfaces. It uses the global DNS and ISATAP link-local addresses as next-hop addresses for IPv6 routes. 1. Introduction This document describes the operation of the NOID multihoming proposal [NOID] on nodes with ISATAP interfaces [ISATAP]. It uses the global DNS and ISATAP link-local addresses as next-hop addresses for IPv6 routes. In particular, any peer node that has a Fully-Qualified Domain Name (FQDN) in the global DNS that resolves to a list of both AAAA and A Templin Expires May 25, 2004 [Page 1] Internet-Draft Operation of NOID on ISATAP November 2003 records is considered a potential ISATAP node. The question of whether the node actually participates in the ISATAP and NOID protocols is determined by sending an ICMPv6 Node Information Query and getting an ICMPv6 Node Information Response back [NIQUERY]. 2. Assumptions This document makes the same assumptions as stated in ([NOID], section 1.2: "The main technical assumptions this proposal makes it that the DNS infrastructure can be used for verification of the relationship between locators on both the initiator of communication and the responding peer. In particular, it assumes that getting DNS reverse maps (ip6.arpa) populated for the hosts that wish to take advantage of multihoming will not be a significant problem." In addition, this document assumes that nodes with advertising ISATAP interfaces will arrange to have both AAAA and A records added to the DNS for their FQDNs. 3. Terminology The terminology of [RFC1122],[RFC2461], [NOID], and [ISATAP] applies to this document. 4. NOID Context Establishment Using ISATAP As described in ([NOID], section 3) it is assumed that the DNS maintains consistent forward and reverse maps for hosts that support the protocol. The following specific actions are taken by initiating and responding NOID peers with ISATAP interfaces during context establishment: When a host initiates a connection, it first looks up the FQDN of the target peer in the DNS. If the DNS returns both AAAA and A records, the initiator assumes that the target peer is a dual-stack (IPv6/ IPv4) node that participates in both the NOID protocol and ISATAP. Next, if default or more-specific routes for the IPv6 addresses returned by the DNS do not exist, the initiator uses the IPv4 addresses from the A records to construct ISATAP link-local addresses ([ISATAP], section 4.1) for use as the IPv6 next-hop toward the IPv6 addresses. Assuming the initiator has an enabled ISATAP interface, it next sends one or more ICMPv6 Node Information Query messages to one of the peer's ISATAP link-local unicast addresses. The Node Information Queries are sent as specified in [NIQUERY]. Templin Expires May 25, 2004 [Page 2] Internet-Draft Operation of NOID on ISATAP November 2003 If the initiator receives an ICMPv6 Node Information Response from the peer, it assumes that the peer implements the NOID and ISATAP protocols. and verifies that the node names and addresses returned in the response match the IPv6 addresses that were discovered from the DNS FQDN lookup. If the set of addresses and names in the Node Information Response message exactly match the addresses discovered from the DNS, the initiator deems the peer an authentic NOID and ISATAP participant and adds host routes to its IPv6 routing table for each of the IPv6 addresses, using the ISATAP link-local address as the next-hop address. Otherwise, the peer is deemed untrustworthy. Next, the initiator performs a 3-way state creation exchange with the responder as specified in [NOID], section 4.1). (Note that this process MAY carry ULP packets as piggybacked messages.) At some time during or after this context creation 3-way handshake, the responding peer will perform a reverse-DNS lookup on one of the initiator's IPv6 addresses in the ip6.arpa domain, i.e., as an inverse operation of the DNS lookup originally performed by the initiator. The responder uses the information returned by the DNS to validate the locators used by the initiating host and optionally authenticate the initiator by performing a Node Information Query/Node Information Response exchange as described above. 5. Other Considerations All other protocol specifications in [NOID] and [ISATAP] are followed exactly. Additionally, first-pass path MTU discovery can be piggybacked onto the Node Information Query/Node Information Response process. 6. IANA Considerations See [NIQUERY] for IANA considerations relating to the Node Information Query and Node Information Response messages. 7. Security considerations Security considerations are discussed in the normative references. 8. Acknowledgements TBD Normative References [ISATAP] Templin, F., Gleeson, T., Talwar, M. and D. Thaler, "Intra-Site Automatic Tunnel Addressing Protocol", draft-ietf-ngtrans-isatap (work in progress), October Templin Expires May 25, 2004 [Page 3] Internet-Draft Operation of NOID on ISATAP November 2003 2003. [NIQUERY] Crawford, M., "IPv6 Node Information Queries", draft-ietf-ipngwg-icmp-name-lookups (work in progress), June 2003. [NOID] Nordmark, E., "Multihoming without IP Identifiers", draft-nordmark-multi6-noid (work in progress), October 2003. [RFC1122] Braden, R., "Requirements for Internet Hosts - Communication Layers", STD 3, RFC 1122, October 1989. [RFC2461] Narten, T., Nordmark, E. and W. Simpson, "Neighbor Discovery for IP Version 6 (IPv6)", RFC 2461, December 1998. [RPREF] Draves, R. and R. Hinden, "Default Router Preferences, More-Specific Routes, and Load Sharing", draft-ietf-ipv6-router-selection (work in progress), June 2002. Author's Address Fred L. Templin Nokia 313 Fairchild Drive Mountain View, CA 94110 US Phone: +1 650 625 2331 EMail: ftemplin@iprg.nokia.com Templin Expires May 25, 2004 [Page 4] Internet-Draft Operation of NOID on ISATAP November 2003 Intellectual Property Statement The IETF takes no position regarding the validity or scope of any intellectual property 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; neither does it represent that it has made any effort to identify any such rights. 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This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION Templin Expires May 25, 2004 [Page 5] Internet-Draft Operation of NOID on ISATAP November 2003 HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Acknowledgment Funding for the RFC Editor function is currently provided by the Internet Society. Templin Expires May 25, 2004 [Page 6]