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The PortKnocko project is composed of two parts: an iptables module (user space) and a netfilter module (kernel space). Both modules are used to implement the Port Knocking and SPA (Simple Packet Authentication).
FPGA based hardware card which implements above 4 giga bps network traffic throughput under affordable hardware cost. With linux driver and kernel patch, software based IPTables/netfilter firewall can be easily upgraded to a multi-giga high end firewall.