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Editor to share with you how to use the Netstat command in the linux system, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

The Netstat command is used to display a variety of network-related information, such as network connections, routing tables, interface status (Interface Statistics), masquerade connections, multicast members (Multicast Memberships), and so on.

1-check all connections

Use the an option to list all connections in the system, $netstat-a

This shows all tcp, udp, and unix connections to the system.

2-check all tcp/udp/unix socket connections

Use the t option to list only tcp connections, $netstat-at

Similarly, use the u option to list only udp connections, $netstat-au

Use the x option to list only Unix socket connections, $netstat-ax

3-also lists the process ID/ process name

Use the p option to display the PID or process name while listing the connections, and it can also be used with other options, $netstat-ap

4-list the port number instead of the service name

Use the n option to speed up the output, which does not perform any reverse queries, but outputs numbers directly. Since no query is required, the output of the results is much faster. $netstat-an

5-output only listening port

Use the l option to output only the listening port. It cannot be used with the an option, because an outputs all ports, $netstat-l

6-output network statu

Use the s option to output statistics for each protocol, including the number of packets received / sent, $netstat-s

7-output Nic status

Use the I option to display only the statistics of the network card, $netstat-I

8-display Multicast Group multicast group information

Use the g option to output multicast group information for IPV4 and IPV6, $netstat-g

9-displays network routing information

Use r to output network routing information, $netstat-r

10-continuous output

Use the c option to continuously output the result $netstat-c

11-filter out a port

Connect with grep to filter out a port connection, $netstat-anp | grep 3306

12-count the number of connections

In conjunction with the wc and grep commands, you can count the number of connections to a specified port $netstat-anp | grep 3306 | wc-l

This outputs the number of connections to the mysql service port (that is, 3306).

The above is all the contents of the article "how to use Netstat commands in linux system". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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