tcp        0      0     TIME_WAIT   timewait (58.45/0/0)
tcp        0      0     TIME_WAIT   timewait (59.36/0/0)
tcp        0   2944     FIN_WAIT1   on (0.35/0/0)

Especially for the 3rd row,what does 0 , FIN_WAIT1, on and (0.35/0/0) mean respectively?


The 2 & 3rd columns are receive and send queues, respectively. (0 2944 above) That's basically the number of packets bytes waiting to be sent (2944) or received (0).

FIN_WAIT is the standard TCP state of the open port. Specifically, that's an actively closed connection. (more info here) The client has sent its FIN packet, but hasn't received a FIN-ACK back yet.

The last column is a bit more complex. It's timer information related to the specific state the connection is in.

  • 1
    Here (on Linux) Recv-Q and Send-Q are # of bytes, not # of packets. – DerfK May 19 '11 at 16:56

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What netstat you are running matters, I am assuming this is Windows Netstat, look here for more info: http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/netstat.mspx?mfr=true

There are several steps in setting up and tearing down a TCP connection. The TCP Connection State column just tells you where in the process that socket is at the moment.

This explains TCP Connection states in more detail.

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