DevHacker Noonabout 5 hours ago
Inside DNP3: Building an Outstation from the Ground Up
10 min read
A security researcher built a Python DNP3 lab with custom outstation targets and parsers. The work tested Class 0 Integrity Reads, Select-Before-Operate enforcement, administrative function codes, and transport fragment handling. Malformed frames triggered IIN2.2 Parameter Error, and Stop Application halted processing while keeping the TCP session alive.
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