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Re:CLIP OS – France’s cybersecurity agency’s open source, se... by jeffrallen on Thursday September 20, 2018 @11:48AM (#18033335)
You are talking about data diodes: https://www.owlcyberdefense.com/about-data-diodes
Re:CLIP OS – France’s cybersecurity agency’s open source, se... by 3pt14159 on Thursday September 20, 2018 @07:28PM (#18036171)
Thanks. I knew about diodes, but I hadn't heard that there was an official term for what I've been describing.

Edit: Interesting that these guys focus on fiber. It's also possible just by using UDP and cutting the return lines on an ethernet cable.