RFC 793 State machine study

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Presentation transcript:

RFC 793 State machine study

Normal close sequence Page 39, Figure 13

1. ESTABLISHED ESTABLISHED Normal close sequence Page:39 Figure. 13 TCP A TCP B SEQ=100 Should_ACK=300 SEQ=300 Should_ACK=100 1. ESTABLISHED ESTABLISHED

Normal close sequence TCP A TCP B 2. (Close) 0 Page:39 Figure. 13 TCP A TCP B SEQ=100 Should_ACK=300 SEQ=300 SEQ=300 Should_ACK=101 Should_ACK=100 SEQ=100 CTL=FIN ACK=300 DATA= 2. (Close) 0 FIN-WAIT-1 --> <SEQ=100><ACK=300><CTL=FIN,ACK> --> CLOSE-WAIT

Normal close sequence TCP A TCP B Page:39 Figure. 13 TCP A TCP B SEQ=100 SEQ=101 Should_ACK=300 Should_ACK=300 SEQ=300 Should_ACK=101 SEQ=300 CTL= ACK=101 DATA= 3. FIN-WAIT-2 <-- <SEQ=300><ACK=101><CTL=ACK> <-- CLOSE-WAIT

Normal close sequence TCP A TCP B 4. (Close) Page:39 Figure. 13 TCP A TCP B SEQ=101 SEQ=101 Should_ACK=301 Should_ACK=300 SEQ=300 Should_ACK=101 SEQ=300 CTL=FIN ACK=101 DATA= 4. (Close) TIME-WAIT <-- <SEQ=300><ACK=101><CTL=FIN,ACK> <-- LAST-ACK

Normal close sequence TCP A TCP B Page:39 Figure. 13 TCP A TCP B SEQ=101 Should_ACK=301 SEQ=NA SEQ=300 SEQ=301 Should_ACK=101 Should_ACK=101 Should_ACK=NA SEQ=101 CTL= ACK=301 DATA= 5. TIME-WAIT --> <SEQ=101><ACK=301><CTL=ACK> --> CLOSED

Normal close sequence TCP A TCP B 6. (2 MSL) CLOSED Page:39 Figure. 13 SEQ=NA SEQ=101 Should_ACK=301 Should_ACK=NA SEQ=NA Should_ACK=NA 6. (2 MSL) CLOSED