What is Port Authentication?

Port Authentication is a network security feature used to control access to network ports based on device credentials. Defined by the IEEE 802.1X standard, it ensures only authorized devices can connect to the network. Port Authentication uses RADIUS (Remote Authentication Dial-In User Service) servers to validate devices attempting to access the network. Once authenticated, the device is granted access to the network, improving security and preventing unauthorized devices from connecting. It is commonly used in enterprise and industrial networks to protect sensitive devices like HMIs and PLCs.

Example Scenario: Port Authentication in a SCADA System:

In a SCADA system, Port Authentication ensures only authorized HMI and PLC devices can connect to the network. A managed switch is configured with 802.1X, requiring devices to authenticate via a RADIUS or TACACS+ server before accessing the network. Unauthorized devices attempting to connect will have their port disabled, blocking network access. This enhances security by ensuring only verified devices can interact with critical SCADA systems, safeguarding infrastructure from potential threats.

Content created by Mike Day