T1InitRetrans.seq - INIT message is transmitted again if T1-Init timer expires
To check that if the T1-init timer expires, the endpoint MUST retransmit INIT
and restart the T1-init timer without changing state.
./T1InitRetrans.seq [-tooloption ...] -pkt ./T1InitRetrans.def
-tooloption : v6eval tool option
See Also: ../common/STD_PKT_COMMON.def
../common/SCTP_COMMON.def
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.
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.
None
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.