Linux View Network Connection Status

CLOSED: No connection is active or in progress
Establised: The state of the connection has been established;
Syn_sent: Send the active line (SYN sign) of the connection packet;
SYN_RECV: Received a request to connect the active connection packet;
FIN_WAIT1: The socket Service (socket) has been interrupted and the connection is disconnected;
Fin_wait2: The connection has been hung up, but is waiting for the other host to respond to the packet disconnection confirmation;
Time_wait: The connection has been hung up, but the socket is still on the network waiting for the end;
LISTEN: Usually used in the service of the listening port! You can use the "-L" parameter lookup.
CLOSING: Both sides try to close simultaneously
Time_wait: The other side has initialized a release
Last_ack: Waiting for all packets to die

Linux View Network Connection Status