Modbus/TCP is an open automation protocol used in a variety of SCADA, PLC, and industrial IO applications. Modbusfw is a Linux 2.4.x Netfilter Extension that permits filtering decisions (DROP, REJECT, etc.) based on application-layer values, allowing finer-grained access control than is currently possible by simply blocking TCP port 502


http://modbusfw.sourceforge.net/



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