CN-5-4-2 - BU Creating Circular Reference
Host
HA----------R2----------R1----------R0
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|----MN' |---- |----MN |----CN(NUT)
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Home Link Link2 Link1 Link0
(Foreign) (Foreign)
Link0 3ffe:501:ffff:100::/64 Link1 3ffe:501:ffff:101::/64 Foreign Link Link2 3ffe:501:ffff:102::/64 Foreign Link 2 Home Link 3ffe:501:ffff:104::/64 Home Link CN(NUT) 3ffe:501:ffff:100::X
Auto Configuration (InterfaceID)MN(in Link1) 3ffe:501:ffff:101::Y
Increased in each test (InterfaceID)MN care-of address MN'(MN in Home Link) 3ffe:501:ffff:104::Y
Increased in each test (InterfaceID)MN home address R0(Link0) 3ffe:501:ffff:100::1 R1(Link1) 3ffe:501:ffff:101::1 R2(Link2) 3ffe:501:ffff:102::1 HA(Home Link) 3ffe:501:ffff:104::1
Reboot NUT (reboot.rmt)
MN' MN R1 HA R0 CN(NUT)
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| | | | |------>| 1.RA
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| | | | |------>| 2.NS
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| | | | |<------| 3.NA
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| |-------------->|-------------->| 4.Echo Request
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| |<--------------|<--------------| 5.Echo Reply
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| |------------------------------>| 6.Echo Request(Home Address option)
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| |<------------------------------| 7.BE(Status=1)
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| |------------------------------>| 8.CoTI
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| |-------------->|-------------->| 9.HoTI
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| |<------------------------------| 10.CoT
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| |<--------------|<--------------| 11.HoT
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| |------------------------------>| 12.BU
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| |<------------------------------| 13.BA(Status=0)
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| |------------------------------>| 14.Echo Request(Home Address option)
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| |<------------------------------| 15.Echo Reply(Type2 Routing Header)
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| |------------------------------>| 16.HoTI
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| |-------------->|-------------->| 17.CoTI
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| |<------------------------------| 18.HoT
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| |<--------------|<--------------| 19.CoT
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|-------------------------------------->| 20.BU (Home Address=CoA)
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| | | | | | (*1)
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|-------------------------------------->| 21.Echo Request(Home Address=CoA)
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|<--------------------------------------| 22.BE(Status=1) (*2)
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1. Send Router Advertisement. 2. Send Neighbor Solicitation. 3. Receive Neighbor Advertisement. 4. Send ICMP Echo Request. 5. Receive ICMP Echo Reply. 6. Send ICMP Echo Request(Home Address option). 7. Receive Binding Error(Status=1). 8. Send Care-of Test Init. 9. Send Home Test Init. 10. Receive Care-of Test. 11. Receive Home Test. 12. Send Binding Update. 13. Receive Binding Acknowledgement. 14. Send ICMP Echo Request(Home Address option). 15. Receive ICMP Echo Reply(Type2 Routing Header). 16. Send Home Test Init. 17. Send Care-of Test Init. 18. Receive Home Test. 19. Receive Care-of Test. 20. Send Binding Update(Home Address=CoA). *Expire BA timer. 21. Send ICMP Echo Request. 22. Receive Binding Error(Status=1).
Packet Format 20. Binding Update 21. ICMP_Echo Request(Home Address option) 22. Binding Error
(*1) MN and MN' does not receive Binding Acknowledgement.
(*2) MN' receives Binding Error.(Binding Cache entry is not created.) - The Destination Address is set to the Source Address of ICMP Echo Request (MN home address). - The Status field is set to 1. - The Home Address field is set to the value in the Home Address option in the ICMP Echo Request (MN care-of address).
(draft-ietf-mobileip-ipv6-24.txt)
6.1.7 Binding Update Message
The care-of address is specified either by the Source Address field in the IPv6 header or by the Alternate Care-of Address option, if present. The care-of address MUST be a unicast routable address. IPv6 Source Address MUST be a topologically correct source address. Binding Updates for a care-of address which is not a unicast routable address MUST be silently discarded. Similarly, the Binding Update MUST be silently discarded if the care-of address appears as a home address in an existing Binding Cache entry, with its current location creating a circular reference back to the home address specified in the Binding Update (possibly through additional entries).