Detailed explanation of netstat command

At this time, you can use the "netstat -nlutp" command to check whether the dhcp service is started

netstat

View the connected service port (ESTABLISHED)

netstat -a

View all services Port (LISTEN, ESTABLISHED)

sudo netstat -ap

View all service ports and display the corresponding service program name

If you want to check the TCP or UDP port usage, use

netstat -anp

If Some processes cannot be seen. If only "-" is displayed, you can try

sudo netstat -anp

netstat detailed explanation

-a or -all to display all connected sockets

-n Established valid links

-o Display timer

-p -programs Display the programs in use

-t Display the connection status of tcp transmission

-u Display the connection status of udp transmission

-l Display the socket of the monitored server

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