Q: How do you segment a mesh?

A: You can’t.

Legacy IoT devices, Industrial Control Systems with custom networking, are exceptionally difficult to secure. Typically, these devices contain only enough compute capabilities to support their primary operational function. They have limited memory, low power, constrained CPU resources, and very little network bandwidth. They do not authenticate incoming messages, authorize users, log network traffic, support on-line updates, or use the OSI protocol stack. Many use entirely proprietary, vendor-specific, bit- or byte-oriented protocols.

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