TCP state machine (part II)

rcv ACK of SYN \ / rcv SYN,ACK

| -------------- | | -----------

| x | | snd ACK

| V V

| CLOSE +---------+

| ------- | ESTAB |

| snd FIN +---------+

| CLOSE | | rcv FIN

V ------- | | -------

+---------+ snd FIN / \ snd ACK +---------+

| FIN |<----------------- ------------------>| CLOSE |

| WAIT-1 |------------------ | WAIT |

+---------+ rcv FIN \ +---------+

| rcv ACK of FIN ------- | CLOSE |

| -------------- snd ACK | ------- |

V x V snd FIN V

+---------+ +---------+ +---------+

|FINWAIT-2| | CLOSING | | LAST-ACK|

+---------+ +---------+ +---------+

| rcv ACK of FIN | rcv ACK of FIN |

| rcv FIN -------------- | Timeout=2MSL -------------- |

| ------- x V ------------ x V

\ snd ACK +---------+delete TCB +---------+

------------------------>|TIME WAIT|------------------>| CLOSED |

+---------+ +---------+

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