Method and device for unidirectional data transfer

A method of data transfer, comprising:

• receiving data at an ingress interface of a device, the received data comprising payload data and ingress destination data,
• assigning received data to one of a plurality of logical data streams based on the ingress destination data,
• the device removing the ingress destination data associated with the payload data and adding egress destination data to the payload data, for each logical data stream, wherein egress destination data added depends on the logical data stream,
• outputting data at an egress interface of the device, the output data comprising the payload data and the egress destination data,
• wherein data flow between the ingress interface and the egress interface of the device is unidirectional.

A device for unidirectional data transfer, comprising:

• an ingress interface for receiving data, the received data comprising payload data and ingress destination data,
• an egress interface for outputting data, the output data comprising the payload data and egress destination data,
• wherein the device is configured to:
• assign the received data to one of a plurality of logical data streams based on the ingress destination data,
• remove the ingress destination data associated with the payload data and add the egress destination data to the payload data, for each logical data stream, wherein egress destination data added depends on the logical data stream, and
• allow data to flow between the ingress interface and the egress interface only from the ingress interface to the egress interface.