NAME

MN-2-2-1-1-010 - BU rejected (Status = 135)


TARGET

Host


TOPOLOGY

                    
                                  |
                                  R       CN0
                                  |        |
                     -----+-------+--------+---------------- LinkZ
                          |
                          R2                      NUTY
                          |                         |
                     -----+-------+-----------------+------- LinkY
                                  |
                                  R1              NUTX
                                  |                 |
                     -----+-------+-----------------+------- LinkX
                          |
                         HA0             Node0    NUT0
                          |               |         |
    ----------------------+---------------+---------+------- Link0
                    
Link0 3ffe:501:ffff:100::/64 home link
LinkX 3ffe:501:ffff:102::/64  
LinkY 3ffe:501:ffff:103::/64  
LinkZ 3ffe:501:ffff:104::/64  
HA0(Link0) 3ffe:501:ffff:100:200:ff:fe00:a0a0  
Node0(Link0) 3ffe:501:ffff:100:200:ff:fe00:a3a3  
R1(LinkX) 3ffe:501:ffff:102:200:ff:fe00:a4a4  
R2(LinkY) 3ffe:501:ffff:103:200:ff:fe00:a6a6  
CN0(LinkZ) 3ffe:501:ffff:104:200:ff:fe00:a8a8  


INITIALIZATION

 1. Selection Option
    - home registration Binding Update Retransmissions : YES
    - home registration Binding Update Retransmissions(status=135) : YES/NO
 2. Position of Mobile Node
    - none


TEST PROCEDURE

                    
       HA0     NUT0     R1      R2      CN0
        |       |       |       |        |
        | ----> |       |       |        | 1.Router Advertisement
        |       |       |       |        |
        |      NUTX     |       |        |
        |       |       |       |        |
        |       | <---- |       |        | 2.Router Advertisement
        |       |       |       |        |
        | <---- |       |       |        | 3.Neighbor Solicitations
        |       |       |       |        | 4.(no reply:3 seconds)
        |       |       |       |        |
        | <---- |       |       |        | 5.Binding Update
        | ----> |       |       |        | 6.Binding Acknowledgement
        |       |       |       |        |
        |       |       |       |        | 7.(wait) (*1)
        |       |       |       |        |
                    
        1. Send Router Advertisement. (HA0 -> HA0_allnode_multi)
        2. Send Router Advertisement. (R1 -> R1_allnode_multi)
        3. Receive Neighbor Solicitations. (NUT0 -> HA0)
        4. (no reply)
            # Wait during a maximum of 3 seconds(RFC2461).
        5. Receive Binding Update. (NUTX -> HA0)
        6. Send Binding Acknowledgement. (HA0 -> NUTX)
            # The Status field is set to 135(Sequence number out of window).
        7. (wait)
            # Wait during 32(MAX_BINDACK_TIMEOUT) seconds.
                    
        Packet Format is:
          6. Binding Acknowledgement
                    


JUDGEMENT

 The judgment changes by the following settings of "INITIALIZATION 1. Selection Option".
                    
   - home registration Binding Update Retransmissions(status=135) : YES
     (*1) PASS: HA0 receives the retransmitting of Binding Update.
                Then, check whether this packet fills all of the following,
                 - The Sequence Number field is set to the following value of 
                   the Sequence Number field of Binding Acknowledgement.
                    
   - home registration Binding Update Retransmissions(status=135) : NO
     (*1) PASS: HA0 does not receive the retransmitting of Binding Update.
                    


REFERENCE

                    
(draft-ietf-mobileip-ipv6-24.txt)
                    
11.7.3 Receiving Binding Acknowledgements
                    
(snip)
                    
   When a mobile node receives a packet carrying a valid Binding
   Acknowledgement, the mobile node MUST examine the Status field as
   follows:
                    
(snip)
                    
   o  If the Status field indicates that the Binding Update was rejected
      (the Status field is greater than or equal to 128), then the
      mobile node can take steps to correct the cause of the error and
      retransmit the Binding Update (with a new Sequence Number value),
      subject to the rate limiting restriction specified in Section
      11.8.  If this is not done, or it fails, then the mobile node
      SHOULD record in its Binding Update List that future Binding
      Updates SHOULD NOT be sent to this destination.
                    
                    
11.7.1 Sending Binding Updates to the Home Agent
                    
(snip)
                    
   The last Sequence Number value sent to the home agent in a Binding
   Update is stored by the mobile node.  If the sending mobile node has
   no knowledge of the right Sequence Number value, it may start at any
   value.  If the home agent rejects the value, it sends back a Binding
   Acknowledgement with status code 135, and the last accepted sequence
   number in the Sequence Number field of the Binding Acknowledgement.
   The mobile node MUST store this information and use the next Sequence
   Number value for the next Binding Update it sends.