CN-3-4-3 - Handoff - Binding Updates that fail to satisfy tests
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 Link2) 3ffe:501:ffff:102::Y
Increased in each test (InterfaceID)MN care-of address 2 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(Sequence No=1)
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| |<------------------------------| 13.BA
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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.CoTI
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|<--------------------------------------| 17.CoT
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|---------------------->|-------------->| 18.HoTI
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|<----------------------|<--------------| 19.HoT
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|-------------------------------------->| 20.BU(Sequence No=1,Source Address=CoA2)
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|<--------------------------------------| 21.BA(Status=135,Destination Address=CoA2) (*1)
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|-------------------------------------->| 22.Echo Request(Home Address option, Source Address=CoA2)
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| |<------------------------------| 23.Echo Reply(Type2 Routing Header,Destination Address=CoA1) (*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(Sequence No=1). 13. Receive Binding Acknowledgement. 14. Send ICMP Echo Request(Home Address option). 15. Receive ICMP Echo Reply(Type2 Routing Header,Destination Address=Link1). 16. Send Care-of Test Init. 17. Receive Care-of Test. 18. Send Home Test Init. 19. Receive Home Test. 20. Send Binding Update(Sequence No=1,Source Address=CoA2). 21. Receive Binding Acknowledgement(Status=135,Destination Address=CoA2). 22. Send ICMP Echo Request(Home Address option, Source Address=CoA2). 23. Receive ICMP Echo Reply(Type2 Routing Header,Destination Address=CoA1).
Packet Format 20. Binding Update 21. Binding Acknowledgement 22. ICMP_Echo Request(Home Address option) 23. ICMP Echo Reply(Type2 Routing Header)
(*1) MN' receives Binding Acknowledgement. - The Destination Address is set to the Source Address of the Binding Update (MN care-of address 2). - The Status field is set to 135. - Type 2 Routing Header is included. - The Home Address field of Type 2 Routing Header is set to MN home address.
(*2) MN receives ICMP Echo Reply. (Binding Cache entry is not changed.) - The Destination Address is set to MN care-of address 1. - Type 2 Routing Header is included. - The Home Address field of Type 2 Routing Header is set to MN home address.
(draft-ietf-mobileip-ipv6-24.txt)
9.5.1 Receiving Binding Updates
Before accepting a Binding Update, the receiving node MUST validate the Binding Update according to the following tests:
(snip)
For packets carrying Binding Updates that fail to satisfy all of these tests for any reason other than insufficiency of the Sequence Number, registration type change, or expired nonce index values, they MUST be silently discarded.
9.5.4 Sending Binding Acknowledgements
If the Source Address field of the IPv6 header that carried the Binding Update does not contain a unicast address, the Binding Acknowledgement MUST NOT be sent, and the Binding Update packet MUST be silently discarded. Otherwise, the acknowledgement MUST be sent to the Source Address. Unlike the treatment of regular packets, this addressing procedure does not use information from the Binding Cache. However, a routing header is needed in some cases. If the Source Address is the home address of the mobile node, i.e., the Binding Update did not contain a Home Address destination option, then the Binding Acknowledgement MUST be sent to that address, and the routing header MUST NOT be used. Otherwise, the Binding Acknowledgement MUST be sent using a type 2 routing header which contains the mobile node's home address.