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quick start: http://www.cipherdyne.org/fwknop/docs/fwknop-tutorial.html#quick-start
disadvantages (rarely talked about here) https://en.wikipedia.org/wiki/Port_knocking#Disadvantages
http://www.cipherdyne.org/fwknop/docs/fwknop-tutorial.html
http://www.cipherdyne.org/fwknop/docs/features.html
https://sourceforge.net/p/fwknop/mailman/fwknop-discuss/?viewmonth=201804
read me section of https://github.com/mrash/fwknop
https://help.ubuntu.com/community/SinglePacketAuthorization