1. Simultaneous Location in Home and Foreign in Monami6 65 th IETF at Dallas, Texas, USA Benjamin Koh Keigo Aso

2. Contents 1.Limitations with MIPv6 and MCoA 2.Scenario 3.Problem 4.Possible Operations 5.Mailing List Discussions 6.Conclusion

3. MIPv6: Limitation of One Forwarding Destination Mobile IPv6 allows MN to use primary CoA and to register only it at HA. –The primary CoA is used as the forwarding destination for all packets addressed to HoA by the HA. When the MN is at home, the HA may be unable to intercept any packets addressed to MN ’ s HoA.

4. MCoA: Limitation on Simultaneous Usage of Home and Foreign Links MCoA ID states: “ It is impossible to utilize all the interfaces when one interface is attached to the home link and the others are attached to foreign links. ” Implementer chooses whether only the home link or foreign links is to be used.

5. Requirement of Simultaneous Location MN can set preference for each flow in HA. HA can select the IF for a distributed flow. Even if IF1 is connected to home network, HA can choose either Path1 or Path2 for forwarding flows. MN IF1IF2 foreign network1 foreign network2 home network HA MN IF1IF2 home network foreign network2 FlowAFlowB FlowA + FlowB HA CoA1CoA2 HoA(?) CoA2 Binding Cache  ??? Binding Cache  HoA-CoA1  HoA-CoA2 Path1 Path2

6. Problem The MN cannot use both of its IF for flows. –If it use IF2, it must register a binding cache at HA. –If it use IF1, it must de-register a binding cache at HA. The preferences in HA set by the MN before the movement is not available any more.

7. Possible Operation Using a CoA (home CoA) at home network. HA still performs proxy ND for MN HoA MN IF1IF2 home network foreign network2 FlowA FlowB HA Binding Cache  HoA-CoA2  HoA-home CoA home CoACoA2

8. ML Discussion Only the flows explicitly specified should be forwarded to the CoA, otherwise, they should be forwarded using normal (MCoA) routing. –HA cannot choose the forwarding path to MN –MN must explicitly manage flows for each CN

9. ML Discussion Scenario could be achieved by home network configuration. HA is configured with virtual home link. –This is a configuration assumption, not a solution

10. Observation By having the MN use CoA at home network allows for flow control by HA at any time

11. Next Steps Is the scenario/requirement addressed clearly? Has the problem(s) been adequately addressed? Any interest to develop possible solutions to the problem(s)?