firewall knock operator
fwknop stands for the "FireWall KNock OPerator", and implements an
authorization scheme called Single Packet Authorization (SPA). This method of
authorization is based around a default-drop packet filter and libpcap. SPA is
essentially next generation port knocking.

Maintainer: Ingo Feinerer <feinerer@logic.at>

WWW: https://www.cipherdyne.org/fwknop/
