Packet-level analysis with Wireshark is essential for diagnosing Modbus TCP and OPC UA faults in industrial DCS networks. This guide covers Modbus TCP MBAP header structure and exception codes, OPC UA binary protocol session sequencing, port mirroring setup on industrial switches, and two real-world case studies: a Yokogawa CENTUM VP Modbus TCP timeout caused by a gateway firmware bug, and a Schneider Modicon M580 OPC UA authentication failure from a missing intermediate CA certificate.
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