Using n2n on MacOS
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In order to use n2n on MacOS you need to first install support for the tap interface.
if you are a brew (https://brew.sh) user you can do it in a couple of steps

- brew tap homebrew/cask
- brew cask install tuntap

Note that in the latest OS versions (for instance MacOS High Sierra), you may need to
need to enable their kernel extension in

  System Preferences → Security & Privacy → General

For more information refer to vendor documentation or the Apple Technical Note:

  https://developer.apple.com/library/content/technotes/tn2459/_index.html