Hundred Three Hundred

RFC 9293 shows the basic three-way handshake with concrete numbers:

  TCP A                                              TCP B
1. CLOSED                                            LISTEN
2. SYN-SENT    --> <SEQ=100><CTL=SYN>              --> SYN-RECEIVED
3. ESTABLISHED <-- <SEQ=300><ACK=101><CTL=SYN,ACK> <-- SYN-RECEIVED
4. ESTABLISHED --> <SEQ=101><ACK=301><CTL=ACK>     --> ESTABLISHED

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