The Fox DataDiode supports raw socket data transfers based on TCP. The diode software on the BLACK side acts as a listening server that receives raw data from systems on the network and forwards it through the hardware Data Diode. The RED proxy server receives the data and uses a client raw socket to forward this data to the specified destination on the network.

TCP is natively supported by the Fox DataDiode windows service and optional for the OpenBSD Fox DataDiode software.