The meaning of state in netstat

June 23, 2019 linux

State in netstat -an parameter has the following meaning.

LISTEN: Listen for connection requests from remote TCP ports.
SYN_SENT: Wait for a matching connection request after sending the connection request.
SYN_RECEIVED: After receiving and sending a connection request, wait for the other party to confirm the connection request.
ESTABLISHED: Represents an open connection, which is commonly used as a concurrent connection.
FIN_WAIT1: Wait for confirmation of remote TCP connection interruption request or previous connection interruption request.
FIN_WAIT2: Waits for connection interruption request from remote TCP.
CLOSE_WAIT: Wait for the connection interruption request from the local user.
CLOSING: Wait for the remote TCP to acknowledge the connection interruption.
LAST_ACK: Wait for confirmation of the connection interruption request originally sent to remote TCP.
TIME_WAIT: Wait long enough to ensure that the remote TCP receives the acknowledgement of the connection interruption request.
CLOSED: no connection status.