Simultaneous Location in Home and Foreign in Monami6

65th IETF at Dallas, Texas, USA

Benjamin Koh

Keigo Aso

Contents

1. Limitations with MIPv6 and MCoA

2. Scenario

3. Problem

4. Possible Operations

5. Mailing List Discussions

6. Conclusion

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.

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.

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

IF1 IF2

foreign network1foreign network2

home networkHA

MN

IF1 IF2

home networkforeign network2

FlowA FlowB

FlowA + FlowB FlowA + FlowB

HA

CoA1 CoA2

HoA(?) CoA2

Binding Cache???

Binding CacheHoA-CoA1HoA-CoA2

Path1

Path2

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.

Possible Operation

• Using a CoA (home CoA) at home network.

• HA still performs proxy ND for MN HoA MN

IF1 IF2

home networkforeign network2

FlowA FlowB

HA

Binding CacheHoA-CoA2HoA-home CoA

home CoA CoA2

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

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

Observation

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

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)?