Exploring the Mechanism of NETSTAT -A: Last-ack, Fin-wait-1, and Syn-send

  • Thread starter Deniel
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In summary, The "NETSTAT -A" command is used to display all active connections and their current state. The state column shows the different states of the connections, such as Last-ack, Fin-wait-1, and syn-send. These states are created systematically and can be explained with examples. The ESTABLISHED state indicates a successful connection. In case of suspected hacking, referring to the man page or using a link for Windows users can provide further clarification.
  • #1
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
 
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  • #2
By theway, i also see ESTABLISHED.
What I should do then ? Please help True, I think there is someone hacking me.
 
  • #3
man page

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

FAQ: Exploring the Mechanism of NETSTAT -A: Last-ack, Fin-wait-1, and Syn-send

What is NETSTAT -A?

NETSTAT -A is a command line tool used to display the active TCP connections, ports, and protocols on a network. It provides information on how the network is being used and which applications and services are communicating with each other.

What is the significance of Last-ack, Fin-wait-1, and Syn-send in NETSTAT -A?

Last-ack, Fin-wait-1, and Syn-send are all different states of the TCP connection process. Last-ack is the final acknowledgement sent by the receiver in a TCP connection before it closes. Fin-wait-1 is the state where the connection is waiting for a final acknowledgement from the other end. Syn-send is the initial synchronization state where the two devices exchange information to establish a TCP connection.

How can exploring these mechanisms help in network troubleshooting?

By examining the states of Last-ack, Fin-wait-1, and Syn-send in NETSTAT -A, network administrators can identify any issues or errors in the TCP connection process. This can help in pinpointing the root cause of network problems and resolving them quickly.

Can the states of Last-ack, Fin-wait-1, and Syn-send change during a TCP connection?

Yes, the states can change during a TCP connection. For example, if a connection is abruptly terminated, the state may change from Syn-send to Fin-wait-1. Additionally, if there are any errors or interruptions in the connection, the states may change accordingly.

Is it necessary to use NETSTAT -A for monitoring TCP connections?

No, there are other tools and methods for monitoring TCP connections. However, NETSTAT -A is a commonly used and efficient tool for quickly viewing the status of TCP connections on a network. It also provides additional information such as the process ID and application name associated with each connection.

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