© 2006 Cisco Systems, Inc. All rights reserved.IP6FD v Examining Mobility Examining Mobile IPv6

© 2006 Cisco Systems, Inc. All rights reserved.IP6FD v Mobile IPv6 Model IPv6 mobility varies from IPv4 mobility: IPv6 address space enables mobile IP deployment in any type of large environment. Foreign agents are no longer required. MIPv6 takes advantage of the IPv6 protocol. Triangle routing is not used in some cases, and the route optimization process is secure without prearrangement. Mobile nodes work transparently. The home agent discovery process is more efficient. There is less tunneling in IPv6 mobility.

© 2006 Cisco Systems, Inc. All rights reserved.IP6FD v Mobile IPv6 Process Mobile IPv6 Model (Cont.) Correspondent Node Home Agent Home Link Mobile IPv6 Node Binding Update Acquire CoA Binding Acknowledgement

© 2006 Cisco Systems, Inc. All rights reserved.IP6FD v Mobile IPv6 Process (Cont.) Mobile IPv6 Model (Cont.) Correspondent Node Home Agent Home Link Mobile IPv6 Node Packets from the correspondent node are routed to the home agent and then tunneled to the mobile node.

© 2006 Cisco Systems, Inc. All rights reserved.IP6FD v Packets can be routed directly to and from mobile nodes and corresponding peers. Mobile IPv6 Route Optimization Mobile IPv6 Model (Cont.) Correspondent Node Home Agent Home Link Mobile IPv6 Node Binding Acknowledgement Binding Update

© 2006 Cisco Systems, Inc. All rights reserved.IP6FD v Dynamic Home Agent Discovery Mobile IPv6 Model (Cont.) Mobile nodes may discover home agents on their home link via use of a home agent address discovery request. The request is sent to the anycast address of the Mobile IPv6 home agent. The home agent responds with a home agent address discovery reply message. The mobile node may then complete home registration and receive services from that home agent.

© 2006 Cisco Systems, Inc. All rights reserved.IP6FD v Mobile Node Returning Home Mobile IPv6 Model (Cont.) The mobile node, upon returning home, must instruct the home agent to stop acting on its behalf. Care must be taken not to confuse link-local processes while the home agent is still acting on behalf of the mobile node. Once the request has been made, the mobile node (at home) must send a neighbor advertisement to advertise its own link-layer address for the home address.

© 2006 Cisco Systems, Inc. All rights reserved.IP6FD v Summary IPv6 mobility differs from IPv4 mobility as follows: IPv6 address space enables Mobile IP more effectively in any large environment. Foreign agents are no longer required in Mobile IPv6. The routing path is optimized.

© 2006 Cisco Systems, Inc. All rights reserved.IP6FD v2.08-9