Introduction to Mobile IPv6
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1 1 Introduction to Mobile IPv6 III IPv6 Global Summit Moscow Dr. Dimitrios Kalogeras GRNET
2 Outline Introduction Relevant Features of IPv6 Major Differences between MIPv4 and MIPv6 Mobile IPv6 Operation Home Agent Discovery Mechanism Handover Quality of Service Conclusions References 2
3 Terminology Mobile Node (MN) Mobile Station Home Agent (HA) Base Station Correspondent Node (CN) Any node in a network, fixed or mobile 3
4 Introduction 4 Mobile IPv6 is intended to enable IPv6 nodes to move from one IP subnet to another Routing protocol for mobile stations Nothing more - nothing less Transparent to upper layers Strange routing protocol No intermediate routers involved Routing information state is updated by the end stations Mobile nodes Correspondent nodes Except from the Home Agent While a mobile node is away from home It sends information about its current location to a home agent The home agent intercepts packets addressed to the mobile node and tunnels them to the mobile node s present location
5 Introduction (cont.) Mobile IPv6 scenario Mobile Node move Mobile Node Home Link Link A Internet Link B Link C Home Agent 5 Correspondent Node
6 Relevant Features of IPv6 Address Autoconfiguration Stateless autoconfiguratoin Network Prefix + Interface ID Stateful autoconfiguration DHCPv6 Neighbor Discovery Discover each other s presence and find routers Determine each other s link-layer addresses Maintain reachability information 6
7 Relevant Features of IPv6 (cont.) Extension Headers Routing header For route optimization Destination Options header For mobile node originated datagrams 7
8 Major Differences between MIPv4 and MIPv6 No FA in Mobile IPv6 Mobile IPv6 requires every mobile node to support IPv6 Decapsulation Address Autoconfiguration Neighbor Discovery 8
9 Major Differences between MIPv4 and MIPv6 (cont.) Packets delivery MIPv6 mobile node uses care-of address as source address in foreign links No ingress filtering problem Correspondence Node uses IPv6 routing header rather than IP encapsulation Supports Route Optimization naturally 9
10 Mobile IPv6 Messages and Related Data Structures All new messages used in MIPv6 are defined as IPv6 Destination Options These options are used in IPv6 to carry additional information that needs to be examined only by a packet s destination node Next Header Hdr Ext Len Options 10
11 Mobile IPv6 Messages and Related Data Structures (cont.) Four new Destination Options Binding Update Used by an MN to inform its HA or any other CN about its current care-of address Binding Acknowledgement Used to acknowledge the receipt of a Binding Update 11
12 Mobile IPv6 Messages and Related Data Structures (cont.) Binding Request Used by any node to request an MN to send a Binding Update with the current care-of address Home Address Used in a packet sent by a mobile node to inform the receiver of this packet about the mobile node s home address 12
13 Mobile IPv6 Messages and Related Data Structures (cont.) Data Structures Binding Cache Binding Update List Home Agent List i.e. Home Address Care of Address Lifetime Agent 3ffe:2101:0:b00::10 3ffe:2101:0:a00:260:97ff:fe8b:4c Yes 3ffe:2101:0:b00::15 3ffe:2101:0:b00:a00:6aff:fe2b:137c 43 NO 13
14 Mobile IPv6 Operation Home Agent Registration An MN performs address autoconfiguration (stateful or stateless) to get its care-of address The MN registers its care-of address with its home agent on the home link Use Binding Update Destination Option The HA uses proxy Neighbor Discovery and also replies to Neighbor Solicitations on behalf of the MN 14
15 Mobile IPv6 Operation (cont.) Home Agent Registration (1) Binding Update (2) Binding Acknowledgement Mobile Node Home Link Link A (1) Link B (2) Internet Link C Home Agent 15 Correspondent Node
16 Mobile IPv6 Operation (cont.) Route Optimization To avoid triangle routing (1) Packet (2) Tunneled Packet (3) Packet Mobile Node Home Link Link A (2) (1) Internet (3) Link B Link C Home Agent 16 Correspondent Node
17 Mobile IPv6 Operation (cont.) Route Optimization (1) Binding Update (2) Packet Mobile Node Home Link Link A Internet (1) (2) Link B Link C Home Agent 17 Correspondent Node
18 Mobile IPv6 Operation (cont.) MN-Terminated Packet Delivery Internet 18 Src: CN s address Dst: MN s home address Binding cache hit Src: CN s address Dst: MN s care-of address Routing Header: MN s home address Src: CN s address Dst: MN s care-of address Routing Header: MN s home address Src: CN s address Dst: MN s home address MN receives packets from loopback interface
19 Mobile IPv6 Operation (cont.) MN-Originated Packet Delivery Internet 19 Src: MN s care-of address Dst: CN s address Destination Optoins header Home Address Option: MN s home address Move MN s home address to Source Address Src: MN s home address Dst: CN s address MN at home: Src: MN s home address Dst: CN s address MN at visited network: Src: MN s care-of address Dst: CN s address Destination Optoins header Home Address Option: MN s home address
20 Mobile IPv6 Operation (cont.) Movement Detection While away from home, an MN selects one router and one subnet prefix advertised by that router to use as the subnet prefix in its primary care-of address To wait for the periodically sent Advertisements 20
21 Mobile IPv6 Operation (cont.) Binding Management To trigger Binding Acknowledgement, the MN sets the Acknowledge bit in the Binding Update Retransmitting the Biding Update periodically until receipt of the acknowledgement An MN MUST set the Acknowledge bit in Binding Updates addressed to an HA The MN MAY also set the Acknowledge bit in Binding Updates sent to a CN 21
22 Home Agent Discovery Mechanism (1) Binding Update to Home-Agents anycast address (2) Binding Acknowledgement including the Home Agents List; rejects the registration request Home Agent 1 Mobile Node Home Link Link A Home Agent 3 Home Agent 2 Internet (1) Home Agent 3 9 Home Agent 1 2 Home Agent 2-3 (2) Link B Link C Correspondent Node 22
23 Home Agent Discovery Mechanism (cont.) Home Link Link A 23 (1) Binding Update to Home Agents 3 (2) Binding Acknowledgement, registration OK Home Agent 1 Home Agent 2 Home Agent 3 Internet (1) Home Agent 3 9 Home Agent 1 2 Home Agent 2-3 (2) Mobile Node Link B Link C Correspondent Node
24 Handover Horizontal without router change Vertical with router change 24
25 Handover -Assisted Smooth Handovers CN (3) (4) (1) MN sends a Binding Update to an HA on previous network (2) HA returns a Binding Acknowledgement 25 IPv6 router with HA func. move (2) (3) (1) IPv6 router MN (3) HA tunnels packets to MN (4) MN sends a Binding Update to CN
26 Handover (cont.) Three kinds of handover operations Smooth Handover Minimizes data loss during the time that the MN is establishing its link to the new access point Fast Handover Minimizes or eliminates latency for establishing new communication paths to the MN at the new access router Seamless Handover Both Smooth and Fast Handover 26
27 27 Ηandover + ΑΑΑ
28 Quality of Service IPv6 header has two QoS-related fields 20-bit Flow Label Used by a source to label sequences of packets for which it requests special handling by the IPv6 routers Geared to IntServ and RSVP 8-bit Traffic Class Indicator Used by originating nodes and/or forwarding routers to identify and distinguish between different classes or priorities of IPv6 packets Geared to DiffServ 28
29 Quality of Service (cont.) New IPv6 option QoS Object QoS Object describes QoS requirement, traffic volume and packet classification parameters for MN's packet stream Included as a Destination Option in IPv6 packets carrying Binding Update and Biding Acknowledgment messages 29
30 MIPv6 Status RFC 3775 Implementation Linux, MIPL x kernel versions, 2.6 coming BSD, KAME stack 4.9, NetBSD 1.6.2, OpenBSD 3.4 Cisco, IOS technology preview available by request ohanami EFT Microsoft, Expect beta release sometime in Q
31 Remote Network Support Leaf networks in Rural Locations Microwave / WiMAX links Flexible access to on-line resources for response team Provide temporary Internet connectivity to the remote site 31
32 Mobile Library Mobile library provides Internet access και virtual library service Can provide coverage to multiple Libraries from a mobile station 32
33 Conclusions Mobile IPv6 is An efficient and deployable protocol for handling mobility with IPv6 Lightweight protocol To minimize the control traffic needed to effect mobility 33
34 References C. Perkins, Mobility for IPv6, Internet Draft, June K. Zhigang et al., QoS in Mobile IPv6, in Proc. of International Conferences on Info-tech and Info-net 2001, vol. 2, pp N. Montavont and T. Noel, Handover Management for Mobile Nodes in IPv6 Networks, IEEE Communication Magazine, pp , Aug Deliverables 6net ( D Survey and Evaluation of MIPv6 Implementations D.4.1.2, Initial MIPv6 Support Guide D Final MIPv6 Support Guide 34
35 Questions??? 35
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