TCP - protocol.how

TCP Reference

Overview

TCP (Transmission Control Protocol) is a transport layer protocol that provides reliable, ordered, and error-checked delivery of data. This simulator demonstrates the TCP state machine including the three-way handshake and four-way termination.

Commands

LISTEN LISTEN

Enter passive open mode (server), waiting for incoming connections

LISTEN

CONNECT CONNECT [port]

Initiate active open (client), send SYN to establish connection

CONNECTCONNECT 80

SEND SEND [data]

Send data over established connection (simplified simulation)

SEND Hello WorldSEND

RECEIVE RECEIVE <segment>

Simulate receiving a TCP segment (SYN, SYN-ACK, ACK, FIN)

RECEIVE SYNRECEIVE SYN-ACKRECEIVE ACKRECEIVE FIN

CLOSE CLOSE

Initiate connection close, send FIN segment

CLOSE

RST RST

Reset connection immediately, return to CLOSED state

RST

STATUS STATUS

Display current connection state and sequence numbers

STATUS

HELP HELP [command]

Display help information

HELPHELP CONNECT

Tips

Type help or ? for command list
Type help <command> for details
Press Ctrl+L to clear terminal