Linux Shell Scripting Cookbook, Second Edition - Second Edition

Network traffic and port analysis

Network ports are essential parameters of network-based applications. Applications open ports on the host and communicate to a remote host through opened ports at the remote host. Having awareness of opened and closed ports is essential for security context. Malwares and root kits may be running on the system with custom ports and custom services that allow attackers to capture unauthorized access to data and resources. By getting the list of opened ports and services running on the ports, we can analyze and defend the system from being controlled by root kits and helps to remove them efficiently. The list of opened ports is not only helpful for malware detection, but is also useful for collecting information ...