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A comment on Vulnerable industrial controls directly connected to Internet. Parent comment

Re:Vulnerable industrial controls directly connected to Inte... by snowwindwaves on Monday January 29, 2018 @03:15PM (#16260282)
Devices exist to filter out modbus data that doesn't belong [0], but I have yet to see one in the wild. Whenever I have offered plant owners additional security such as a VPN endpoint at the satellite ISPs base station, they have opted against it due to cost.

[0] https://www.tofinosecurity.com/products/Tofino-Modbus-TCP-En...

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