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Linux list processes using ports11/21/2023 ![]() In the next section, we will discuss how to check which ports are currently open on a Linux system. Understanding how ports work and which ports are associated with which services is important for troubleshooting network issues and securing your system. ![]() When you send an email, your email client communicates with the email server using SMTP (Simple Mail Transfer Protocol) over port 25 by default. ![]() When the packet reaches its destination, the destination port number is used to identify the process or service that should receive the packet.įor example, when you browse the internet, your web browser communicates with web servers using HTTP (Hypertext Transfer Protocol) over port 80 by default. Each packet has a header that contains information about the packet, including the source and destination IP addresses and the source and destination port numbers. When data is sent over a network, it is broken down into packets. UDP is a connectionless protocol, which means that data can be sent without establishing a connection first.īoth types of ports are used in different scenarios to facilitate communication between applications and services.
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