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- +---------+ ---------\ active OPEN
- | CLOSED | \ -----------
- +---------+<---------\ \ create TCB
- | ^ \ \ snd SYN
- passive OPEN | | CLOSE \ \
- ------------ | | ---------- \ \
- create TCB | | delete TCB \ \
- V | \ \
- +---------+ CLOSE | \
- | LISTEN | ---------- | |
- +---------+ delete TCB | |
- rcv SYN | | SEND | |
- ----------- | | ------- | V
- +---------+ snd SYN,ACK / \ snd SYN +---------+
- | |<----------------- ------------------>| |
- | SYN | rcv SYN | SYN |
- | RCVD |<-----------------------------------------------| SENT |
- | | snd ACK | |
- | |------------------ -------------------| |
- +---------+ 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 |
- +---------+ +---------+
- TCP Connection State Diagram
- Figure 6.
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