data diode

A data diode is a network security device that connects two networks while physically restricting data transfer to a single direction. Because the hardware has no return path, a configuration error or an attack cannot open communication in the opposite direction, unlike software settings or firewall rules. It is also called a unidirectional gateway.

Data diodes are used where monitoring data or records must move from one network to another while all access in the reverse direction stays blocked. They help keep networks separated in defense, critical infrastructure such as power generation, and industrial control systems.

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