How to use "netstat" command to monitor network services?

Monitoring a dedicated Linux server to identify or block attacks is a very important process. Dedicated Linux servers offer powerful tools that you can use.

netstat is such a tool (network utility) that can be used to monitor network services. It gives you information about the processes using a port. Usually, netstat displays information about all ports in use but you can limit the information only to a specific port, using the "grep" command.

For example, to see what service is running on port 80, run the following command:

netstat -ant | grep 80

Entered correctly, the above command will show you the web server processes running on port 80.

To check the number of open connections on port 80, run the command:

netstat -an |grep :80 |wc -l

To see what ports your dedicated Linux server is listening to, run the following command:

netstat -ant | grep LISTEN

netstat is one of the most powerful Linux commands, especially when used in combination with "grep" command. To find out more about netstat and grep commands, execute in the command line "man netstat" and "man grep".

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