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TCP Flow Animation
Scrub the full life of a TCP connection — the three-way handshake (SYN → SYN/ACK → ACK), data transfer, then the four-way teardown (FIN/ACK … TIME-WAIT). Both endpoints' state machine is highlighted at every step, with the flags and seq/ack on the wire.
step 1/8
Client
SYN-SENT
SYN
seq=0 · ack=0
Server
LISTEN
SYN
Client opens the connection: SYN with its initial sequence number (seq=x).