NAME

  T1InitRetrans.seq - INIT message is transmitted again if T1-Init timer expires


PURPOSE

  To check that if the T1-init timer expires, the endpoint MUST retransmit INIT
  and restart the T1-init timer without changing state.


SYNOPSIS

  ./T1InitRetrans.seq [-tooloption ...] -pkt ./T1InitRetrans.def
    -tooloption : v6eval tool option
  See Also: ../common/STD_PKT_COMMON.def
            ../common/SCTP_COMMON.def


PRE-TEST CONDITION

  Association is not established between endpoint A and B. Arrange the
  data in Endpoint A such that INIT-ACK is not sent in response to INIT
  message.


TEST PROCEDURE

  Endpoint A                           Endpoint B                ULP
  (CLOSED)                             (CLOSED)
                                                   <-----    Associate
                <----------------       INIT
  Don't send                            Start T1-Init timer
  INIT-ACK                                   |
                                             | T1-INIT timer Expires
                                             |
                <----------------       INIT
                                              Restart T1-Init timer
  TEST DESCRIPTION:
  1. Try to make an association from endpoint B to endpoint A by sending
     INIT message from endpoint B. Don't send INIT-ACK in response to 
     INIT message. Record the message sequence using a signal emulator.
  2. Check A: INIT message is sent again after expiry of T1-Init timer.
  3. Check B: In the retransmitted message, Init-Tag value is same as 
     was in the previous INIT message.
  4. Check C: Was the message sequence as above.


NOTE

  None


REFERENCE

  RFC 4960
  4.  SCTP Association State Diagram
    Notes:
    1)  If the State Cookie in the received COOKIE ECHO is invalid (i.e.,
        failed to pass the integrity check), the receiver MUST silently
        discard the packet.  Or, if the received State Cookie is expired
        (see Section 5.1.5), the receiver MUST send back an ERROR chunk.
        In either case, the receiver stays in the CLOSED state.
    2)  If the T1-init timer expires, the endpoint MUST retransmit INIT
        and restart the T1-init timer without changing state.  This MUST
        be repeated up to 'Max.Init.Retransmits' times.  After that, the
        endpoint MUST abort the initialization process and report the
        error to the SCTP user.