CN-6-1 - ICMP Error - Persistent ICMP Destination Unreachable messages
Host
HA----------R2----------R1----------R0
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|---- |---- |----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(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 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
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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.ICMP Destination Unreachable message
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|------------------------------>| 17.Echo Request(Home Address option)
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|<------------------------------| 18.Echo Reply(Type2 Routing Header)
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| |---------------------->| 16'.ICMP Destination Unreachable message
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|------------------------------>| 17'.Echo Request(Home Address option)
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| | | | | Repeat 16. and 17. until receiving BE (Max 420s)
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|<------------------------------| 18'.BE(Status=1) (*1)
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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(Alternate CoA). 13. Receive Binding Acknowledgement. 14. Send ICMP Echo Request(Home Address option). 15. Receive ICMP Echo Reply(Type2 Routing Header). 16. Send ICMP Destination Unreachable message. 17. Send ICMP Echo Request(Home Address option). 18. Receive ICMP Echo Reply(Type2 Routing Header). 16'. Send ICMP Destination Unreachable message. 17'. Send ICMP Echo Request(Home Address option). *Repeat 16. and 17. until receiving Bindig Error (Max 420s) 18'. Receive Binding Error(Status=1).
Packet Format 16'. ICMP Destination Unreachable 17'. ICMP_Echo Request(Home Address option) 18'. Binding Error
(*1) MN receives Binding Error. (Binding Cache entry is deleted.) - The Destination Address is set to the Source Address of ICMP Echo Request (MN care-of address). - The Status field is set to 1.
(draft-ietf-mobileip-ipv6-24.txt)
9.3.4 Receiving ICMP Error Messages
Thus, in all cases, any meaningful ICMP error messages caused by packets from a correspondent node to a mobile node will be returned to the correspondent node. If the correspondent node receives persistent ICMP Destination Unreachable messages after sending packets to a mobile node based on an entry in its Binding Cache, the correspondent node SHOULD delete this Binding Cache entry. Note that if the mobile node continues to send packets with the Home Address destination option to this correspondent node, they will be dropped due to the lack of a binding. For this reason it is important that only persistent ICMP messages lead to the deletion of the Binding Cache entry.