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How to monitor network activity on a Linux system

There are many reasons why you may want to monitor the network activity on your Linux system. You may be troubleshooting a network issue, you may want to check to make sure that there are no malicious applications creating suspicious network activity, or you may simply want to know if any processes are phoning home. Whatever the reason, here are a few methods to see which processes on your system are engaged in network activity and who they are communicating with.

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