Title

  Test IKEv2.EN.I.1.1.2.2: Stop of retransmission of IKE_SA_INIT requests 
  Part A: (BASIC)

Purpose

  To verify an IKEv2 device stops retransmission when it receives the corresponding response.

References

  * [RFC 4306] - Sections 2.1, 2.2 and 2.4
  * [RFC 4718] - Sections 2.2 and 2.3

Test Setup

  * Network Topology
      Connect the devices according to the Common Topology.
  * Configuration
      In each part, configure the devices according to the Common Configuration. In
      addition, set retransmission timer to 1 second.
  * Pre-Sequence and Cleanup Sequence
      IKEv2 on the NUT is disabled after each part.

Procedure

   NUT                  TN1
(End-Node)           (End-Node)
    |                    |
    |------------------->| IKE_SA_INIT request (HDR, SAi1, KEi, Ni)
    |                    | (Judgement #1)
    |                    |
    |                    * wait for the event of a timeout
    |                    |
    |------------------->| IKE_SA_INIT request (HDR, SAi1, KEi, Ni)
    |                    | (Judgement #2)
    |<-------------------| IKE_SA_INIT Response (HDR, SAr1, KEr, Nr) 
    |                    | (Packet #1)
    |                    |
    |                    * wait for the event of a timeout
    |                    |
    |--------X           | never send IKE_SA_INIT request (HDR, SAi1, KEi, Ni) 
    |                    | (Judgement #3)
    |                    |
    V                    V



Packet #1
See Common Packet #2

  Part A: (BASIC)
       1. NUT starts to negotiate with TN1 by sending IKE_SA_INIT request.
       2. Observe the messages transmitted on Link A.
       3. TN1 waits for the event of a timeout on NUT.
       4. Observe the messages transmitted on Link A.
       5. TN1 responds with an IKE_SA_INIT response to the NUT.
       6. TN1 waits for the event of a timeout on NUT.
       7. Observe the messages transmitted on Link A.

Observable Result

  Part A
    Step 2: Judgment #1
      The NUT transmits an IKE_SA_INIT request including "ENCR_3DES",
      "PRF_HMAC_SHA1", "AUTH_HMAC_SHA1_96" and "D-H group 2" as proposed
      algorithms.
  
    Step 4: Judgment #2
      The NUT retransmits an IKE_SA_INIT request which has the same Message ID value as the
      previous IKE_SA_INIT request's Message ID value in IKE Header.
  
    Step 7: Judgment #3
      The NUT never retransmits an IKE_SA_INIT request which has the same Message ID value
      as the previous IKE_SA_INIT request's Message ID value in IKE Header.

Possible Problems

  * Each NUT has the different retransmission timers. If it is imposibble to configure the
    retransmission timer, modifying tester is required.