How do I interpret ‘netstat -a’ output

Question :

How do I interpret ‘netstat -a’ output,

Answer :

Some things look strange to me:

  • What is the distinction between,, and [::]?
  • How should each part of the foreign address be read (part1:part2)?
  • What does a state Time_Wait, Close_Wait mean?
  • etc.

Could someone give a quick overview of how to interpret these results?

, usually refers to stuff listening on all interfaces. = localhost (only your local interface)
I’m not sure about [::]

TIME_WAIT means both sides have agreed to close and TCP
must now wait a prescribed time before taking the connection

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CLOSE_WAIT means the remote system has finished sending
and your system has yet to say it’s finished.

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Disclaimer :

The answers provided above are only to be used to guide the learning process. The questions above are open-ended questions, meaning that many answers are not fixed as above. I hope this article can be useful, Thank you

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