What Does NETSTAT -A Reveal About Last-ack, Fin-wait-1, and Syn-send States?

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The command "NETSTAT -A" is used to display all active connections and listening ports on a computer. The state column in the output indicates the status of each connection, with terms like Last-ACK, Fin-Wait-1, SYN-SENT, and ESTABLISHED representing different stages in the TCP connection lifecycle. Last-ACK indicates that the connection is waiting for an acknowledgment of the final segment sent before closing. Fin-Wait-1 shows that the connection is in the process of closing, waiting for a confirmation from the other end. SYN-SENT means that a connection request has been sent but not yet acknowledged. ESTABLISHED signifies an active connection where data can be transmitted between the two endpoints.Concerns about potential hacking can arise if unfamiliar connections are present. It is advisable to monitor these connections and consider further security measures if suspicious activity is detected. For Windows users, additional resources and documentation can provide clarity on interpreting NETSTAT output.
Deniel
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Can you tell me what the mechanism of da command
"NETSTAT -A" is ?

and in the state column, i have seen Last-ack, Fin-wait-1, syn-send
What are they, and how are they created sytematically in actuallity ? Would you please give me examples to prove anything you say too ? Being without any particular examples is also fine but please help clearify them for me..

Thanks
 
Computer science news on Phys.org
By theway, i also see ESTABLISHED.
What I should do then ? Please help True, I think there is someone hacking me.
 
man page

are you using windows? if true the link above can still clarify some things... just look at the output section
 
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