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FFPF is a network monitoring framework designed for three things: speed (handling high link rates), scalability (ability to handle multiple applications) and flexibility. Multiple applications that need to access overlapping sets of packets may share their packet buffers, thus avoiding a packet copy to each individual application that needs it. In addition, context switching and copies across the kernel boundary are minimized by handling most processing in the kernel or on the network card and by memory mapping all buffers to userspace, respectively. For these reasons, FFPF has superior performance compared to existing approaches such as BSD packet filters, and especially shines when multiple monitoring applications execute simultaneously.
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