![]() To use the nmap network discovery tool, you must install it via one of the following commands (as per the distribution ).For many aspiring system administrators, networking is a vast and intimidating topic. The nmap allows the users to find the hosts and the available services on a machine’s network by sending the data packets and diagnosing the response. Method 1: Port Scanning Using nmapĪmong the most common tools for port scanning, nmap offers advanced scanning capabilities. Let’s discuss the port scanners used to do a port scan. 49152-65535: Reserved for the dynamic/private ports.1024: 49151: Reserved for the user or registered ports.0-1023: Reserved for the well-known or system ports. ![]() The port allocation by the ICANN (International Corporation for Assigned Names and Numbers) is as follows: The ports in Linux are reserved for different purposes. To Identify the vulnerabilities in the system that helps the network engineers to diagnose the issues in the system.To find out which services are available or running on a host.To check which ports are opened, closed, or filtered to send or receive the information.We need to do a port scan in Linux for several reasons that are as follows: Port scanners have become a helpful tool to avoid external attacks that scan the ports. With the advancement in network technology, internet attacks have increased. Why Do We Need to Do a Port Scan and What Ports are Used in Linux? Why Do We Need to Do a Port Scan and What Ports are Used in Linux?.This write will discuss the methods to do a port scan in Linux using the below-supporting content: The advancement in network technology produces a lot of risks over the internet/remote connections that cause security issues. Two ports can be used in Linux for an IP: TCP (Transmission Control Protocol) and UDP. The port scan is the process of checking whether the ports it’s listening to the outside connections or not. ![]()
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