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  • Why do you think those devices are so expensive? Commented Jul 17, 2019 at 20:06
  • @flarn2006 My guess is because the market for such devices is very small. There are lots of easier and better alternatives, such as all those discussed in this thread. These kinds of devices are only useful when you can't move your wire someplace safer and you can't fix your networked security. Suppose you've got an old embedded system that doesn't support IPsec and you can't replace the system and you can't move the system. Commented Jul 21, 2019 at 18:53