RFC 793 State machine study Simultaneously active SYN

Simultaneously active SYN Page 32, Figure 8

Simultaneously active SYN SEQ=NA Should_ACK=NA 1. CLOSED TCP A SEQ=NA Page: 32 Figure. 8

Simultaneously active SYN SEQ=100 SEQ=NA Should_ACK=NA SEQ=100 ACK= TCP A SEQ=NA TCP B Should_ACK=NA

Simultaneously active SYN SEQ=100 Should_ACK=301 Should_ACK=NA SEQ=100 ACK= TCP A SEQ=300 SEQ=NA 3. TCP

Simultaneously active SYN SEQ=100 Should_ACK=301 SEQ=100 ACK=301 SEQ=300 ACK= 3. CTL=SYN DATA= TCP A

Simultaneously active SYN SEQ=100 Should_ACK=301 SEQ=100 ACK=301 4. 5. CTL=SYN DATA= TCP A SEQ=100

Simultaneously active SYN SEQ=101 SEQ=100 Should_ACK=301 TCP A SEQ=100 ACK=301 4. 6. ESTABLISHED SEQ=300

Simultaneously active SYN SEQ=101 Should_ACK=301 SEQ=101 ACK=301 TCP A SEQ=300 SEQ=301 Should_ACK=101 Page: 32

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RFC 793 State machine study

Simultaneously active SYN Page 32, Figure 8

Simultaneously active SYN SEQ=NA Should_ACK=NA 1. CLOSED TCP A SEQ=NA Page: 32 Figure. 8 TCP B Should_ACK=NA CLOSED

Simultaneously active SYN SEQ=100 SEQ=NA Should_ACK=NA SEQ=100 ACK= TCP A SEQ=NA TCP B Should_ACK=NA CTL=SYN DATA= 1. 2. CLOSED SYN-SENT --> <SEQ=100><CTL=SYN> Page: 32 Figure. 8 CLOSED. . .

Simultaneously active SYN SEQ=100 Should_ACK=301 Should_ACK=NA SEQ=100 ACK= TCP A SEQ=300 SEQ=NA 3. TCP B Should_ACK=NA CTL=SYN DATA= SEQ=300 ACK= 2. SYN-SENT <-- <SEQ=300><CTL=SYN> --> <SEQ=100><CTL=SYN> SYN-RECEIVED Page: 32 Figure. 8 CTL=SYN DATA= . . . <-- SYN-SENT

Simultaneously active SYN SEQ=100 Should_ACK=301 SEQ=100 ACK=301 SEQ=300 ACK= 3. CTL=SYN DATA= TCP A SEQ=100 ACK= SEQ=300 Should_ACK=NA CTL=SYN DATA= SYN-RECEIVED <-- <SEQ=300><CTL=SYN> <-- SYN-SENT 5. SYN-RECEIVED --> <SEQ=100><ACK=301><CTL=SYN, ACK>. . . Page: 32 Figure. 8 TCP B

Simultaneously active SYN SEQ=100 Should_ACK=301 SEQ=100 ACK=301 4. 5. CTL=SYN DATA= TCP A SEQ=100 ACK= SEQ=300 Should_ACK=NA Should_ACK=101 Page: 32 Figure. 8 TCP B CTL=SYN DATA= SYN-RECEIVED --> <SEQ=100><ACK=301><CTL=SYN, ACK>. . . <SEQ=100><CTL=SYN> --> SYN-RECEIVED

Simultaneously active SYN SEQ=101 SEQ=100 Should_ACK=301 TCP A SEQ=100 ACK=301 4. 6. ESTABLISHED SEQ=300 CTL=SYN DATA= Page: 32 Figure. 8 TCP B Should_ACK=101 SEQ=100 ACK= CTL=SYN DATA= SEQ=300 ACK=101 CTL=SYN DATA= . . . <-- <SEQ=100><CTL=SYN> <SEQ=300><ACK=101><CTL=SYN, ACK> --> <-- SYN-RECEIVED

Simultaneously active SYN SEQ=101 Should_ACK=301 SEQ=101 ACK=301 TCP A SEQ=300 SEQ=301 Should_ACK=101 Page: 32 Figure. 8 TCP B CTL= DATA= 6. 7. ESTABLISHED <-<-. . . <SEQ=300><ACK=101><CTL=SYN, ACK> <SEQ=101><ACK=301><CTL=ACK> --> SYN-RECEIVED ESTABLISHED

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