linux - What does the ESTABLISHED indicator mean after running lsof -


i ran command sudo lsof -i -n -p | grep tcp , wondering if more clarification on output.

specifically, in image:

enter image description here

why have ip:port pointing ip:port , @ label 'established'? confused on means exactly.

established means tcp connection has completed 3-way handshake. (not sure though whether accept must have been called). see tcp state diagram.

why have ip:port pointing ip:port , @ itself

that mean have 2 tcp sockets open in process. likely, 1 listens on port 9092, , 1 connected port 57633 listening socket. port 57633 belongs ephemeral port range, i.e. range of ports os automatically assigns sockets call connect did not call bind assign specific port.


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