NEMO Working Group T. Ernst Internet-Draft Keio University / WIDE Expires: September 7, 2006 H-Y. Lach Motorola Labs March 6, 2006 Network Mobility Support Terminology draft-ietf-nemo-terminology-05 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 September 7, 2006. Copyright Notice Copyright (C) The Internet Society (2006). Abstract This document defines a terminology for discussing network mobility issues and solution requirements. Ernst & Lach Expires September 7, 2006 [Page 1] Internet-Draft NEMO Terminology March 2006 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Architectural Components . . . . . . . . . . . . . . . . . . . 5 2.1. Mobile Network (NEMO) . . . . . . . . . . . . . . . . . . 6 2.2. Mobile Subnet . . . . . . . . . . . . . . . . . . . . . . 7 2.3. Mobile Router (MR) . . . . . . . . . . . . . . . . . . . . 7 2.4. Egress Interface . . . . . . . . . . . . . . . . . . . . . 7 2.5. Ingress Interface . . . . . . . . . . . . . . . . . . . . 7 2.6. Mobile Network Prefix (MNP) . . . . . . . . . . . . . . . 8 2.7. Mobile Network Node (MNN) . . . . . . . . . . . . . . . . 8 2.8. Correspondent Node (CN) . . . . . . . . . . . . . . . . . 8 2.9. Correspondent Router (CR) . . . . . . . . . . . . . . . . 8 2.10. Correspondent Entity (CE) . . . . . . . . . . . . . . . . 8 3. Functional Terms . . . . . . . . . . . . . . . . . . . . . . . 9 3.1. Local Fixed Node (LFN) . . . . . . . . . . . . . . . . . . 10 3.2. Visiting Mobile Node (VMN) . . . . . . . . . . . . . . . . 10 3.3. Local Mobile Node (LMN) . . . . . . . . . . . . . . . . . 10 3.4. NEMO-enabled node (NEMO-node) . . . . . . . . . . . . . . 10 3.5. MIPv6-enabled (MIPv6-node) . . . . . . . . . . . . . . . . 10 4. Nested Mobility Terms . . . . . . . . . . . . . . . . . . . . 11 4.1. Nested Mobile Network (nested-NEMO) . . . . . . . . . . . 11 4.2. Root-NEMO . . . . . . . . . . . . . . . . . . . . . . . . 11 4.3. Parent-NEMO . . . . . . . . . . . . . . . . . . . . . . . 11 4.4. Sub-NEMO . . . . . . . . . . . . . . . . . . . . . . . . . 11 4.5. Root-MR . . . . . . . . . . . . . . . . . . . . . . . . . 11 4.6. Parent-MR . . . . . . . . . . . . . . . . . . . . . . . . 12 4.7. Sub-MR . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.8. Depth . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5. Multihoming Terms . . . . . . . . . . . . . . . . . . . . . . 13 5.1. Multihomed host or MNN . . . . . . . . . . . . . . . . . . 13 5.2. Multihomed Mobile Router . . . . . . . . . . . . . . . . . 13 5.3. Multihomed Mobile Network (multihomed-NEMO) . . . . . . . 14 5.4. Nested Multihomed Mobile Network . . . . . . . . . . . . . 14 5.5. Split NEMO . . . . . . . . . . . . . . . . . . . . . . . . 14 5.6. Illustration . . . . . . . . . . . . . . . . . . . . . . . 14 6. Home Network Model Terms . . . . . . . . . . . . . . . . . . . 17 6.1. Home Link . . . . . . . . . . . . . . . . . . . . . . . . 17 6.2. Home Network . . . . . . . . . . . . . . . . . . . . . . . 17 6.3. Home Address . . . . . . . . . . . . . . . . . . . . . . . 17 6.4. Mobile Home Network . . . . . . . . . . . . . . . . . . . 17 6.5. Distributed Home Network . . . . . . . . . . . . . . . . . 17 6.6. Mobile Aggregated Prefix . . . . . . . . . . . . . . . . . 17 Ernst & Lach Expires September 7, 2006 [Page 2] Internet-Draft NEMO Terminology March 2006 6.7. Aggregated Home Network . . . . . . . . . . . . . . . . . 17 6.8. Extended Home Network . . . . . . . . . . . . . . . . . . 18 6.9. Virtual Home Network . . . . . . . . . . . . . . . . . . . 18 7. Mobility Support Terms . . . . . . . . . . . . . . . . . . . . 19 7.1. Host Mobility Support . . . . . . . . . . . . . . . . . . 19 7.2. Network Mobility Support (NEMO Support) . . . . . . . . . 19 7.3. NEMO Basic Support . . . . . . . . . . . . . . . . . . . . 19 7.4. NEMO Extended Support . . . . . . . . . . . . . . . . . . 19 7.5. NEMO Routing Optimization (NEMO RO) . . . . . . . . . . . 19 7.6. MRHA Tunnel . . . . . . . . . . . . . . . . . . . . . . . 19 7.7. Pinball Route . . . . . . . . . . . . . . . . . . . . . . 19 8. Security Considerations . . . . . . . . . . . . . . . . . . . 21 9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 22 10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 23 11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 24 11.1. Normative References . . . . . . . . . . . . . . . . . . . 24 11.2. Informative References . . . . . . . . . . . . . . . . . . 24 Appendix A. Change Log From Earlier Versions . . . . . . . . . . 25 A.1. Changes since draft-nemo-terminology-04.txt . . . . . . . 25 A.2. Changes since draft-nemo-terminology-03.txt . . . . . . . 26 A.3. Changes since draft-nemo-terminology-02.txt . . . . . . . 26 A.4. Changes since draft-nemo-terminology-01.txt . . . . . . . 26 A.5. Changes since draft-nemo-terminology-00.txt . . . . . . . 27 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 28 Intellectual Property and Copyright Statements . . . . . . . . . . 29 Ernst & Lach Expires September 7, 2006 [Page 3] Internet-Draft NEMO Terminology March 2006 1. Introduction Network mobility support is concerned with managing the mobility of an entire network. This arises when a router connecting a network to the Internet dynamically changes its point of attachment to the fixed infrastructure, thereby causing the reachability of the entire network to be changed in relation to the fixed Internet topology. Such a network is referred to as a mobile network. Without appropriate mechanisms to support network mobility, sessions established between nodes in the mobile network and the global Internet cannot be maintained after the mobile router changes its point of attachment. As a result, existing sessions would break and connectivity to the global Internet would be lost. This document defines the specific terminology needed to describe the problem space, the design goals [1], and the solutions for network mobility support. This terminology aims to be consistent with the usual IPv6 terminology [2] and the generic mobility-related terms already defined in the Mobility Related Terminology [3] and in the Mobile IPv6 specification [4]. Some terms introduced in this document may only be useful for defining the problem scope and functional requirements of network mobility support. Note that the abbreviation NEMO stands for either "a NEtwork that is MObile" or "NEtwork MObility". The former (see Section 2.1) is used as a noun, e.g. "a NEMO" meaning "a mobile network". The latter (see Section 7) refers to the concept of "network mobility" as in "NEMO Basic Support" and is also the working group's name. Section 2 introduces terms to define the architecture while terms needed to emphasize the distinct functionalities of those architectural components are described in Section 3. Section 4, Section 5 and Section 6 describe terms pertaining to nested mobility, multihoming and different configurations of mobile networks at home, respectively. The different types of mobility are defined in Section 7. The last section lists miscellaneous terms which do not fit in any other section. Ernst & Lach Expires September 7, 2006 [Page 4] Internet-Draft NEMO Terminology March 2006 2. Architectural Components A mobile network is composed of one or more mobile IP-subnets and is viewed as a single unit. This network unit is connected to the Internet by means of one or more mobile routers (MRs). Nodes behind the MR (referred to as MNNs) primarily comprise fixed nodes (nodes unable to change their point of attachment while maintaining ongoing sessions), and possibly mobile nodes (nodes able to change their point of attachment while maintaining ongoing sessions). In most cases, the internal structure of the mobile network will be stable (no dynamic change of the topology), but this is not always true. Figure 1 illustrates the architectural components involved in network mobility and defined in the following paragraphs: Mobile Router (MR), Mobile Network (NEMO), Mobile Network Node (MNN), "ingress interface", "egress interface", and Correspondent Node (CN). The other terms "access router" (AR), "Fixed Node (FN)", "Mobile Node (MN)", "home agent" (HA), "home link" and "foreign link" are not terms specific to network mobility and thus are defined in [3]. _ CN ->|_|-| Internet | _____ |-| | |<- home link _ | |-| _ | _ |-|_|-|_____| |-|_|-|-|_|<- HA (Home Agent) | \ | _ foreign link ->| ^ |-|_|<- MR (Mobile Router) .. AR (access ___|___ router) _| |_ |_| |_| ^ ^ MNN1 MNN2 Figure 1: Mobile Network on the Home Link Figure 2 shows a single mobile subnet. Figure 3 illustrates a larger mobile network comprising several subnetworks, attached to a foreign link. Ernst & Lach Expires September 7, 2006 [Page 5] Internet-Draft NEMO Terminology March 2006 _ CN ->|_|-| | _____ _ | |-| | |<- home link |_|-| _ | _ | |-| _ | _ 2 MNNs -> _ |-|_|-|-|_|-|_____| |-|_|-|-|_|<- HA |_|-| . | \ \ | | . |<- foreign ^AR mobile subnet -> . link . ^ MR Figure 2: Single Mobile Subnet on a Foreign Link _ CN->|_|-| mobile subnet->| | _____ _ | |-| | |<- home link MNN1->|_|-|'i'_'e'| _ | |-| _ | _ |--|_|--|-|_|-|_____| |-|_|-|-|_|<- HA 'i'| | \ | ____|__ | mobile subnet-^ _| . |<- foreign |_| . link MNN2 -^ . ^ MR 'i': MR's ingress interface 'e': MR's egress interface Figure 3: Larger Mobile Network Made of 2 Mobile Subnets At the network layer, MRs get access to the global Internet from the Access Router(s) (AR) on a visited link. An MR maintains the Internet connectivity for the entire mobile network. A given MR has one or more egress interface and one or more ingress interface. When forwarding a packet to the Internet, the packet is transmitted upstream through one of the MR's egress interfaces to the AR; when forwarding a packet from the AR down to the mobile network, the packet is transmitted downstream through one of the MR's ingress interfaces. 2.1. Mobile Network (NEMO) As defined in [3]: Ernst & Lach Expires September 7, 2006 [Page 6] Internet-Draft NEMO Terminology March 2006 An entire network, moving as a unit, which dynamically changes its point of attachment to the Internet and thus its reachability in the topology. The mobile network is composed of one or more IP-subnets and is connected to the global Internet via one or more Mobile Routers (MR). The internal configuration of the mobile network is assumed to be relatively stable with respect to the MR. Re-arrangement of the mobile network and changing the attachment point of the egress interface to the foreign link are orthogonal processes and do no affect each other. 2.2. Mobile Subnet A link (subnet) which comprises, or is located within, the mobile network. 2.3. Mobile Router (MR) As defined in [3]: A router capable of changing its point of attachment to the Internet, moving from one link to another link. The MR is capable of forwarding packets between two or more interfaces, and possibly running a dynamic routing protocol modifying the state by which it does packet forwarding. An MR acts as a gateway between an entire mobile network and the rest of the Internet, and has one or more egress interface and one or more ingress interface. Packets forwarded upstream to the rest of the Internet are transmitted through one of the MR's egress interfaces; packets forwarded downstream to the mobile network are transmitted through one of the MR's ingress interfaces. 2.4. Egress Interface As defined in [3]: The network interface of an MR attached to the home link if the MR is at home, or attached to a foreign link if the MR is in a foreign network. 2.5. Ingress Interface As defined in [3]: The interface of an MR attached to a link inside the mobile network. Ernst & Lach Expires September 7, 2006 [Page 7] Internet-Draft NEMO Terminology March 2006 2.6. Mobile Network Prefix (MNP) As defined in [3]: A bit string that consists of some number of initial bits of an IP address which identifies the entire mobile network within the Internet topology. All nodes in a mobile network necessarily have an address containing this prefix. 2.7. Mobile Network Node (MNN) As defined in [3]: Any node (host or router) located within a mobile network, either permanently or temporarily. A Mobile Network Node may either be a fixed node (LFN) or a mobile node (VMN or LMN). 2.8. Correspondent Node (CN) Any node that is communicating with one or more MNNs. A CN could be either located within a fixed network or within another mobile network, and could be either fixed or mobile. 2.9. Correspondent Router (CR) Refers to the entity which is capable of terminating a Route Optimization session on behalf of a Correspondent Node (see also NEMO Route Optimization in Section 7.5). 2.10. Correspondent Entity (CE) Refers to the entity which a Mobile Router or Mobile Network Node attempts to establish a Route Optimization session with. Depending on the Route Optimization approach, the Correspondent Entity maybe a Correspondent Node or Correspondent Router (see also NEMO Route Optimization in Section 7.5) Ernst & Lach Expires September 7, 2006 [Page 8] Internet-Draft NEMO Terminology March 2006 3. Functional Terms Within the term Mobile Network Node (MNN), we can distinguish between Local Fixed Nodes (LFN), Visiting Mobile Nodes (VMN) and Local Mobile Nodes (LMN). The distinction is a property of how different types of nodes can move in the topology and is necessary to discuss issues related to mobility management and access control; however it does not imply that network mobility or host mobility should be handled differently. Nodes are classified according to their function and capabilities with the rationale that nodes with different properties may have different requirements. Figure 4 illustrates a VMN changing its point of attachment from its home link located outside the mobile network to within a mobile network. The figure also illustrates a LMN changing its point of attachment within the mobile network. mobile subnet 1 | _ +++++++<<<+++++++++++ |-|_|-| + + ++<<|_|-| \ |--|_|--|-|_|-|_____|-|-|_| | | ^ | \ | HA_VMN VMN _ | MR | |_|-| |-VMN ^ mobile subnet 2 + + + ++++++++<<<+++++++++++++++++++++++++ +++>>>+++ = changing point of attachment Figure 4: LFN vs LMM vs VMN In a typical use case of NEMO Basic Support [5], only the MR and the HA are NEMO-enabled. LFNs are not MIPv6-enabled nor NEMO-enabled. On the other hand, a VMN or a LMN acting as a mobile router may be NEMO-enabled whereas a VMN or a LMN acting as a mobile node may be MIPv6-enabled. For NEMO Extended Support, details of the capabilities are not known yet at the time of this writing, but NEMO-enabled nodes may be expected to implement some sort of Route Optimization. Ernst & Lach Expires September 7, 2006 [Page 9] Internet-Draft NEMO Terminology March 2006 3.1. Local Fixed Node (LFN) A fixed node (FN), either a host or a router, that belongs to the mobile network and is unable to change its point of attachment while maintaining ongoing sessions. Its address is taken from an MNP. 3.2. Visiting Mobile Node (VMN) Either a mobile node (MN) or a mobile router (MR), assigned to a home link that doesn't belong to the mobile network and which is able to change its point of attachment while maintaining ongoing sessions. A VMN that is temporarily attached to a mobile subnet (used as a foreign link) obtains an address on that subnet (i.e. the address is taken from an MNP). 3.3. Local Mobile Node (LMN) Either a mobile node (MN) or a mobile router (MR), assigned to a home link belonging to the mobile network and which is able to change its point of attachment while maintaining ongoing sessions. Its address is taken from an MNP. 3.4. NEMO-enabled node (NEMO-node) A node that has been extended with network mobility support capabilities as described in NEMO specifications. 3.5. MIPv6-enabled (MIPv6-node) A node which has been extended with host mobility support capabilities as defined in the Mobile IPv6 specification [4]. Ernst & Lach Expires September 7, 2006 [Page 10] Internet-Draft NEMO Terminology March 2006 4. Nested Mobility Terms Nested mobility occurs when there is more than one level of mobility, i.e. when a mobile network acts as an access network and allows visiting nodes to attach to it. There are two cases of nested mobility: o The attaching node is a single VMN (see Figure 4). For instance, when a passenger carrying a mobile phone gets Internet access from the public access network deployed on a bus. o The attaching node is a MR with nodes behind it, i.e. a mobile network (see Figure 5). For instance, when a passenger carrying a PAN gets Internet access from the public access network deployed on a bus. For the second case, we introduce the following terms: 4.1. Nested Mobile Network (nested-NEMO) A mobile network is said to be nested when a mobile network (sub- NEMO) is attached to a larger mobile network (parent-NEMO). The aggregated hierarchy of mobile networks becomes a single nested mobile network (see Figure 5). 4.2. Root-NEMO The mobile network at the top of the hierarchy connecting the aggregated nested mobile networks to the Internet (see Figure 5). 4.3. Parent-NEMO The upstream mobile network providing Internet access to another mobile network further down the hierarchy (see Figure 5). 4.4. Sub-NEMO The downstream mobile network attached to another mobile network up in the hierarchy. It becomes subservient of the parent-NEMO. The sub-NEMO is getting Internet access through the parent-NEMO and does not provide Internet access to the parent-NEMO (see Figure 5). 4.5. Root-MR The MR(s) of the root-NEMO used to connect the nested mobile network to the fixed Internet (see Figure 5). Ernst & Lach Expires September 7, 2006 [Page 11] Internet-Draft NEMO Terminology March 2006 4.6. Parent-MR The MR(s) of the parent-NEMO. 4.7. Sub-MR The MR(s) of the sub-NEMO which is connected to a parent-NEMO 4.8. Depth In a nested NEMO indicates the number of sub-MRs a packet has to cross between a MNN and the root-MR. A MNN in the root-NEMO is a depth 1. If there are multiple root- NEMOs, a different depth is computed from each root-MR. _____ _ | _ | | _ |-|_|-| _ |-|_|-|-| |-| _ _ |-|_|-| \ |-|_|-| \ | |_____| | _ |-|_| _ |-|_|-| | | | |-|_|-| |_|-| \ | \ | | MNN AR sub-MR AR root-MR AR AR HA <--------------><----------><----><---------><--------> sub-NEMO root-NEMO fl Internet Home Network Figure 5: Nested Mobility: a sub-NEMO attached to a larger mobile network Ernst & Lach Expires September 7, 2006 [Page 12] Internet-Draft NEMO Terminology March 2006 5. Multihoming Terms Multihoming, as currently defined by the IETF, covers site- multihoming [10] and host multihoming. We enlarge this terminology to include "multihomed mobile router" and "multihomed mobile network". The specific configurations and issues pertaining to multihomed mobile networks are covered in [6]. 5.1. Multihomed host or MNN A host (e.g. an MNN) is multihomed when it has several addresses to choose between, i.e. in the following cases when it is either: Multi-prefixed: multiple prefixes are advertised on the link(s) the host is attached to, or Multi-interfaced: the host has multiple interfaces to choose between, on the same link or not. 5.2. Multihomed Mobile Router From the definition of a multihomed host, it follows that a mobile router is multihomed when it has several addresses to choose between, i.e. in the following cases when the MR is either: Multi-prefixed: multiple prefixes are advertised on the link(s) an MR's egress interface is attached to, or. Multi-interfaced: the MR has multiple egress interfaces to choose between, on the same link or not (see Figure 6). _____ _ _ | | |_|-| _ |-|_|-| |-| _ _ |-|_|=| \ |_____| | _ |-|_| |_|-| | |-|_|-| \ | MNNs MR AR Internet AR HA Figure 6: Multihoming: MR with multiple E-faces Ernst & Lach Expires September 7, 2006 [Page 13] Internet-Draft NEMO Terminology March 2006 5.3. Multihomed Mobile Network (multihomed-NEMO) A mobile network is multihomed when either a MR is multihomed or there are multiple MRs to choose between (see the corresponding analysis in [6]). MR1 _ | _ |-|_|-| _____ |_|-| |-| | MNNs _ | | |-| _ |_|-| _ |-|_____| | _ |-|_| |-|_|-| |-|_|-| | | MR2 Figure 7: Multihoming: NEMO with Multiple MRs 5.4. Nested Multihomed Mobile Network A nested mobile network is multihomed when either a root-MR is multihomed or there are multiple root-MRs to choose between. 5.5. Split NEMO TBD. See the "issue" web page http://www.sfc.wide.ad.jp/~ernst/nemo/ 5.6. Illustration Figure 6 and Figure 7 show two examples of multihomed mobile networks. Figure 8 shows two independent mobile networks. NEMO-1 is single-homed to the Internet through MR1. NEMO-2 is multihomed to the Internet through MR2a and MR2b. Both mobile networks offer access to visiting nodes and networks through an AR. Let's consider the two following nested scenarios in Figure 8: Scenario 1: What happens when MR2a's egress interface is attached to AR1 ? * NEMO-2 becomes subservient of NEMO-1 Ernst & Lach Expires September 7, 2006 [Page 14] Internet-Draft NEMO Terminology March 2006 * NEMO-1 becomes the parent-NEMO for NEMO-2 and the root-NEMO for the aggregated nested mobile network * NEMO-2 becomes the sub-NEMO * MR1 is the root-MR for the aggregated nested mobile network * MR2a is a sub-MR in the aggregated nested mobile network * NEMO-2 is still multihomed to the Internet through AR1 and ARz * The aggregated nested mobile network is not multihomed, since NEMO-2 cannot be used as a transit network for NEMO-1 Scenario 2: What happens when MR1's egress interface is attached to AR2 ? * NEMO-1 becomes subservient of NEMO-2 * NEMO-1 becomes the sub-NEMO * NEMO-2 becomes the parent_NEMO for NEMO-1 and also the root- NEMO for the aggregated nested mobile network * MR2a and MR2b are both root-MRs for the aggregated nested mobile network * MR1 is a sub-MR in the aggregated nested mobile network * NEMO-1 is not multihomed * The aggregated nested mobile network is multihomed Ernst & Lach Expires September 7, 2006 [Page 15] Internet-Draft NEMO Terminology March 2006 _ | _ | |_|-|-|_|-| _ _____ NEMO-1 MNNs _ | MR1 |-|_|-| | |_|-| ARx | |-| _ AR1 \ | | _ | | | _ |-|_| _ |-|_|-| | |-|_|-| _ |-|_|-| ARy | | | |_|-| MR2a _ | | NEMO-2 MNNs _ | |-|_|-| | |_|-| _ | ARz |_____| \ |-|_|-| AR2 MR2b Figure 8: Nested Multihomed NEMO Ernst & Lach Expires September 7, 2006 [Page 16] Internet-Draft NEMO Terminology March 2006 6. Home Network Model Terms The terms in this section are useful to describe the possible configurations of mobile networks at the home. For a better understanding of the definitions, the reader is recommended to read [7] where such configurations are detailed 6.1. Home Link The link attached to the interface at the Home Agent on which the Home Prefix is configured. The interface can be a virtual interface, in which case the Home Link is a Virtual Home Link. 6.2. Home Network The Network formed by the application of the Home Prefix to the Home Link. With NEMO, the concept of Home Network is extended as explained below. 6.3. Home Address With Mobile IPv6, a Home Address is derived from the Home Network prefix. This is generalized in NEMO, with some limitations: A Home Address can be derived either from the Home Network or from one of the Mobile Router's MNPs. 6.4. Mobile Home Network A Mobile Network that hosts a Home Agent and mobile nodes. The Mobile Network serves as the Home Network for the mobile nodes in the Mobile Network. The MR that owns the MNP acts as the Home Agent for the Mobile Home Network. 6.5. Distributed Home Network A Distributed Home Network is a collection of geographically distributed Home Networks each served by a Home Agent. The same home prefix is advertised in all the Home Networks. The distributed Home Networks maybe connected using a mesh of IPsec protected tunnels. 6.6. Mobile Aggregated Prefix An aggregation of Mobile Network Prefixes that is in turn advertised as the Home Link Prefix. 6.7. Aggregated Home Network The Home Network associated with a Mobile Aggregated Prefix. This Ernst & Lach Expires September 7, 2006 [Page 17] Internet-Draft NEMO Terminology March 2006 Aggregation is advertised as a subnet on the Home Link, and thus used as Home Network for NEMO purposes. 6.8. Extended Home Network The network associated with the aggregation of one or more Home Network(s) and Mobile Network(s). As opposed to the Mobile IPv6 Home Network that is a subnet, the extended Home Network is an aggregation and is further subnetted. 6.9. Virtual Home Network An aggregation of Mobile Network Prefixes that is in turn advertised as the Home Link Prefix. The Extended Home Network and the Aggregated Home Network can be configured as Virtual Home Network. Ernst & Lach Expires September 7, 2006 [Page 18] Internet-Draft NEMO Terminology March 2006 7. Mobility Support Terms 7.1. Host Mobility Support Host Mobility Support is a mechanism which maintains session continuity between mobile nodes and their correspondents upon the mobile host's change of point of attachment. It can be achieved using Mobile IPv6 or other mobility support mechanisms. 7.2. Network Mobility Support (NEMO Support) Network Mobility Support is a mechanism which maintains session continuity between mobile network nodes and their correspondents upon a mobile router's change of point of attachment. Solutions for this problem are classified into NEMO Basic Support, and NEMO Extended Support. 7.3. NEMO Basic Support NEMO Basic Support is a solution to preserve session continuity by means of bi-directional tunneling between MRs and their HAs much like what is done with Mobile IPv6 [4] for mobile nodes when Routing Optimization is not used. Only the HA and the MR are NEMO-enabled. The solution for doing this is solely specified in [5]. 7.4. NEMO Extended Support NEMO Extended support is to provide the necessary optimization, including routing optimization between arbitrary MNNs and CNs. 7.5. NEMO Routing Optimization (NEMO RO) The term "Route Optimization" is accepted in a broader sense than already defined for IPv6 Host Mobility in [4] to loosely refer to any approach that optimizes the transmission of packets between a Mobile Network Node and a Correspondent Node. For more information about NEMO Route Optimization in the NEMO context, see the problem statement [8] and the solution space analysis [9]. 7.6. MRHA Tunnel The bi-directional tunnel between a Mobile Router and its Home Agent. 7.7. Pinball Route A pinball route refers to the non-direct path taken by packets, which Ernst & Lach Expires September 7, 2006 [Page 19] Internet-Draft NEMO Terminology March 2006 are routed via one or more Home Agents, as they transit between a Mobile Network Node and a Correspondent Node. A packet following a pinball route would appear like a ball bouncing off one or more home agents before reaching its final destination. Ernst & Lach Expires September 7, 2006 [Page 20] Internet-Draft NEMO Terminology March 2006 8. Security Considerations As this document only provides terminology and describes neither a protocol nor an implementation or a procedure, there are no security considerations associated with it. Ernst & Lach Expires September 7, 2006 [Page 21] Internet-Draft NEMO Terminology March 2006 9. IANA Considerations This document requires no IANA actions. Ernst & Lach Expires September 7, 2006 [Page 22] Internet-Draft NEMO Terminology March 2006 10. Acknowledgments The material presented in this document takes most of the text from internet-drafts initially submitted to the former MobileIP WG and the MONET BOF and was published as part of a PhD dissertation [11]. The authors would therefore like to thank both Motorola Labs Paris and INRIA (PLANETE team, Grenoble, France) where this terminology originated, for the opportunity to bring it to the IETF, and particularly Claude Castelluccia for his advice, suggestions, and direction, Alexandru Petrescu and Christophe Janneteau. We also acknowledge input from Erik Nordmark, Hesham Soliman, Mattias Petterson, Marcelo Bagnulo, TJ Kniveton, Masafumi Watari, Chan-Wah Ng, JinHyeock Choi and numerous other people from the NEMO Working Group. The Home Network Model section is contributed by Pascal Thubert, Ryuji Wakikawa and Vijay Devaparalli. Ernst & Lach Expires September 7, 2006 [Page 23] Internet-Draft NEMO Terminology March 2006 11. References 11.1. Normative References [1] Ernst, T., "Network Mobility Support Goals and Requirements", draft-ietf-nemo-requirements-05 (work in progress), October 2005. [2] Deering, S. and R. Hinden, "Internet Protocol Version 6 (IPv6)", IETF RFC 2460, December 1998. [3] Manner, J. and M. Kojo, "Mobility Related Terminology", RFC 3753, June 2004. [4] Johnson, D., Perkins, C., and J. Arkko, "Mobility Support in IPv6", RFC 3775, June 2004. [5] Devarapalli, V., Wakikawa, R., Petrescu, A., and P. Thubert, "Network Mobility (NEMO) Basic Support Protocol", RFC 3963, January 2005. [6] Ng, C., "Analysis of Multihoming in Network Mobility Support", draft-ietf-nemo-multihoming-issues-05 (work in progress), February 2006. [7] Thubert, P., Wakikawa, R., and V. Devarapalli, "NEMO Home Network Models", draft-ietf-nemo-home-network-models-05 (work in progress), June 2005. [8] Ng, C., Pascal, P., Masafumi, M., and F. Fan, "Network Mobility Route Optimization Problem Statement", draft-ietf-nemo-ro-problem-statement-01 (work in progress), October 2005. [9] Ng, C., Fan, F., Masafumi, M., and P. Pascal, "Network Mobility Route Optimization Solution Space Analysis", draft-ietf-nemo-ro-space-analysis-01 (work in progress), October 2005. 11.2. Informative References [10] Abley, J., Black, B., and V. Gill, "Goals for IPv6 Site- Multihoming Architectures", RFC 3582, August 2003. [11] Ernst, T., "Network Mobility Support in IPv6", PhD's Thesis. , Universite Joseph Fourier, Grenoble, France , October 2001. Ernst & Lach Expires September 7, 2006 [Page 24] Internet-Draft NEMO Terminology March 2006 Appendix A. Change Log From Earlier Versions The discussions behind the changes in the lattest versions of this documents are reflected in the "issue" web page: http://www.sfc.wide.ad.jp/~ernst/nemo/ A.1. Changes since draft-nemo-terminology-04.txt In Section 3, added in the introduction a note about NEMO-enabled and MIP6-enabled (part of this text was in the definition of NEMO- enabled): Removed Abbreviation "i-face" and "e-face" Replaced "HA" with "home link located outside the mobile network" in the definition of VMN Replaced "address located within a MNP" with "address taken from a MNP" [or derived is better ?] in the definitions of LFN and LMN Replaced term NEMO-Link with Mobile Subnet Figure 4 illustrates a VMN changing its point of attachment from its home link located outside the mobile network to within a mobile network. The figure also illustrates a LMN changing its point of attachment within the mobile network. In a typical use case of NEMO Basic Support [5], only the MR and the HA are NEMO-enabled. LFNs are not MIPv6-enabled nor NEMO- enabled. On the other hand, a VMN or a LMN acting as a mobile router may be NEMO-enabled whereas a VMN or a LMN acting as a mobile node may be MIPv6-enabled. For NEMO Extended Support, details of the capabilities are not known yet at the time of this writing, but NEMO-enabled nodes may be expected to implement some sort of Route Optimization. Removed this note from the definition of "root-MR": "note: this term was referred to as Top-Level Mobile Router, or TLMR in short in former versions of this document).". Added term "Depth" Removed "IPv6" in front of "address" in the definition of a multihomed host and a multihomed mobile router Removed "or multiple prefixes are advertised in the mobile network" from the definition of a multihomed NEMO (5.3) and nested multihomed Ernst & Lach Expires September 7, 2006 [Page 25] Internet-Draft NEMO Terminology March 2006 NEMO (5.4) Added definition for "Routing Optimization" (see Section 7.5). Added definition "Pinball Route" following the discussion on the ML in Dec.05 Added reference to [11] in the ACK section A.2. Changes since draft-nemo-terminology-03.txt Updated the Home Network Model section with new definitions provided by Vijay Added definitions of CR and CE as suggested by the RO PB Statement and Analysis authors [8] Completed figure improvement A.3. Changes since draft-nemo-terminology-02.txt - Issue A18: Redesigned Figure 3 - Issue A22: The follolwing comment added in the definition of "Mobile Network": "Re-arrangement of the mobile network and changing the attachment point of the egress interface to the foreign link are orthogonal processes and do no affect each other." (as suggested by TJ) - Issue A23: Clarified in definition of "NEMO-link" that the link may comprise the mobile network: "A link (subnet) which comprises, or is located within, the mobile network." (as suggested by TJ) - Issue A24: Removed definition of CR (as suggested by TJ) - Issue A25: Removed the miscellaneous terms "Idle MNN" and "Idle mobile network" (as suggested by TJ) - Issue A26: English brush up. A.4. Changes since draft-nemo-terminology-01.txt - Shorten abstract. - Reshaped some figures. - LFN, VMN, LMN: said that the node is able/unable to move while maintaining/not maintaining ongoing sessions. Text already Ernst & Lach Expires September 7, 2006 [Page 26] Internet-Draft NEMO Terminology March 2006 appareared in the document, but not in the definition itself. - NEMO-enabled: said that MR and HA are the only NEMO-enabled nodes in NEMO Basic Support - Removed "NEMO-enabled MR" as this definition is self-contained into "NEMO-enabled Node" - Rephrased the definition of "multihomed host", "multihomed router", "multihomed mobile network" and removed the terms multi-addressed and multi-sited, multi-rooted-NEMO, etc. Such terms were not so useful, and somewhat too long. - Added the case "multiple MNPs are advertised" to the definition of mobile network - Copy-pasted terms defined from RFC 3753 so that the document is self-contained - Updated References - Added new term "Correspondent Router" - Permanently removed NEMO-Prefix. Only MNP will be used - Added terms "Mobile Home Network" and "Distributed Home Network" in the Home Network Model section. These 2 terms were provided by Pascal Thubert on July 30th 2004 A.5. Changes since draft-nemo-terminology-00.txt - NEMO will be used either as the concept for NEtwork MObility and a noun meaning "NEtwork that is MObile" - Deprecated TLMR and MONET. - Added NEMO-prefix, NEMO-link, NEMO-enabled MR. - Precision that IP address of LFN, LMN, or VMN is taken from a MNP - Added abbreviation E-face (Egress interface) and I-face (Ingress interface) - Some re-ordering of terms, and a few typos. - Added some text from the usage draft-thubert-usages (now home network model draft-ietf-nemo-home-network-models) Ernst & Lach Expires September 7, 2006 [Page 27] Internet-Draft NEMO Terminology March 2006 Authors' Addresses Thierry Ernst Keio University / WIDE Jun Murai Lab., Keio University. K-square Town Campus, 1488-8 Ogura, Saiwa-Ku Kawasaki, Kanagawa 212-0054 Japan Phone: +81-44-580-1600 Fax: +81-44-580-1437 Email: ernst@sfc.wide.ad.jp URI: http://www.sfc.wide.ad.jp/~ernst/ Hong-Yon Lach Motorola Labs Paris Espace Technologique - Saint Aubin Gif-sur-Yvette Cedex, 91 193 France Phone: +33-169-35-25-36 Fax: Email: hong-yon.lach@motorola.com URI: Ernst & Lach Expires September 7, 2006 [Page 28] Internet-Draft NEMO Terminology March 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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