NAME

  DupInitAckInShutRecv.seq - Unexpected INIT-ACK chunk is received in SHUTDOWN-RECEIVED state

PURPOSE

  To check that if INIT-ACK chunk is received in SHUTDOWN-RECEIVED state then
  the endpoint should silently discard a received INIT-ACK chunk.

SYNOPSIS

  ./DupInitAckInShutRecv.seq [-tooloption ...] -pkt ./DupInitAckInShutRecv.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 message is sent to endpoint
  B after sending SHUTDOWN message.

TEST PROCEDURE

  Endpoint A                           Endpoint B                ULP
  (ESTABLISHED)                        (ESTABLISHED)

                <----------------       DATA

  SHUTDOWN      ----------------->

  COOKIE-ACK    ----------------->      Silently discard

                <----------------       DATA

  SACK          ----------------->

  TEST DESCRIPTION:

  1. Send INIT-ACK message after sending SHUTDOWN message.
  2. Check A: INIT-ACK message received in SHUTDOWN-RECEIVE state
     is discarded.

NOTE

  None

REFERENCE

  RFC 4960

  5.2.3.  Unexpected INIT ACK

    If an INIT ACK is received by an endpoint in any state other than the
    COOKIE-WAIT state, the endpoint should discard the INIT ACK chunk.
    An unexpected INIT ACK usually indicates the processing of an old or
    duplicated INIT chunk.