router ipsec tunnel AH or ESP inbound error

[Wang Chen]

I use TAHI Conformance Test Set to test kernel-2.6.9-5.EL's ipv6 implement. 
All the test items about router tunnel AH or ESP inbound are failed.
In TAHI ct set, test node will send an ICMP echo request within AH tunnel to 
linux by link0 and expect to recieve an ICMP echo request from link1 without 
the AH. The Network Topology and packet are like following description.

Tester                                  Target 
Tester
             (Link0)                                 (Link1)
  |                                         | 
|
  |-------------------------->|                                         |
  |      ICMP Echo Request   |                                          |
  |      (within AH tunnel)        | 
|
  |                                         |-------------------------->|
  |                                         |      ICMP Echo Request    |
  |                                         | 
|
  |                                         | 
|
  |                                         | 
|
  v                                       v 
v

1.Send ICMP Echo Request within AH tunnel to Link0
2.Receive ICMP Echo Request from Link1
ICMP Echo Request within AH tunnel to Link0
-------------------------------------------------------------------
IP Header     Source Address             SG1_NET2
                    Destination Address       NUT_NET0
AH               SPI                                0x1000
                   Algorithm                        HMAC-MD5
                   Key                                TAHITEST89ABCDEF
IP Header    Source Address              HOST1_NET4
                   Destination Address        HOST1_NET1
ICMP          Type                               128 (Echo Request)
-------------------------------------------------------------------
ICMP Echo Request from Link1
-------------------------------------------------------------------
IP Header    Source Address            HOST1_NET4
                   Destination Address      HOST1_NET1
ICMP          Type                            128 (Echo Request)
-------------------------------------------------------------------
There is no such error before kernel-2.6.9-1.906_EL. Is anything change in 
kernel-2.6.9-5.EL to cause this error? 

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