tcp state machine (tcp/ip illustrated vol. 1) w. richard stevens

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TCP State Machine (TCP/IP Illustrated vol. 1) W. Richard Stevens CLOSED LISTEN SYN_SENT SYN_RCVD ESTABLISHED CLOSE_WAIT LAST_ACK CLOSING FIN_WAIT_1 TIME_WAIT FIN_WAIT_2 Starting point Appl: passive open send: <nothing. Appl: active open send: SYN Appl: close Or timeout App: send data Send:SYN Recv:RST Recv:SYN; send:SYN-ACK Recv: SYN; send:SYN-ACK simultaneous open Recv:ACK; send:<nothing. Recv:SYN,ACK Send:ACK Data transfer state Appl : close Send: FIN passive close Recv:ACK Send: nothing Appl : clos e Close : FIN Appl: close Send:FIN Recv:FIN send: ACK Recv:FIN,ACK; send:ACK Recv:FIN send:ACK Recv: ACK send: <nothing> Recv: ACK send: nothing Simultaneous close 2MSL timeout Active close Client transitions Server transitions

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TCP State Machine (TCP/IP Illustrated vol. 1) W. Richard Stevens. Client transitions. Starting point. Server transitions. CLOSED. Appl: passive open send:

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Page 1: TCP State Machine (TCP/IP Illustrated vol. 1) W. Richard Stevens

1

TCP State Machine (TCP/IP Illustrated vol. 1) W. Richard Stevens

CLOSED

LISTEN

SYN_SENTSYN_RCVD

ESTABLISHED CLOSE_WAIT

LAST_ACK

CLOSINGFIN_WAIT_1

TIME_WAITFIN_WAIT_2

Starting point

Appl: passive open

send: <nothing.Appl: active open

send: SYN

Appl: close

Or timeout

App: send data

Send:SYNRecv:RST

Recv:SYN; send:SYN-ACK

Recv: SYN; send:SYN-ACK

simultaneous open

Recv:ACK; send:<nothing.

Recv:SYN,ACKSend:ACK

Data transfer state Appl : close

Send:

FIN

passive close

Recv:ACK

Send:

nothing

Appl:

close

Close:

FIN

Appl: close

Send:FIN

Recv:FIN

send: ACK

Recv:FIN,ACK;

send:ACK

Recv:FIN

send:ACK

Recv: ACK

send:

<nothing>

Recv: ACK

send: nothing

Simultaneous close

2MSL timeoutActive close

Client transitions

Server transitions

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