OutputNetid State Recv-Q Send-Q Local Address:Port Peer Address:Port Use the netstat command to list all open ports, including TCP and UDP, which are the most common protocols for packet transmission in the network layer. To complete this tutorial, you will need:īefore opening a port on Linux, you must check the list of all open ports, and choose an ephemeral port to open that is not on that list. In this tutorial, you will open an ephemeral port on Linux, since the most common services use the well-known ports.

Port numbers 49152 to 65535 are called the dynamic/private ports.

Port numbers 1024 to 49151 are called the registered/user ports.

Port numbers above 1024 are referred to as ephemeral ports. These include SSH (port 22), HTTP (port 80), HTTPS (port 443). The first 1024 ports (port numbers 0 to 1023) are referred to as well-known port numbers and are reserved for the most commonly used services. This can be changed by manually configuring the service to use a different port, but in general, the defaults can be used. Typically, ports identify a specific network service assigned to them. Within an operating system, a port is opened or closed to data packets for specific processes or network services.

Arch linux virtual box