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High Quality Content by WIKIPEDIA articles! The Berkeley Packet Filter or BPF provides, on some Unix-like systems, a raw interface to data link layers, permitting raw link-layer packets to be sent and received. In addition, if the driver for the network interface supports promiscuous mode, it allows the interface to be put into that mode, so that all packets on the network, even those destined for other hosts, can be received. In addition, it supports "filtering" packets, so that only "interesting" packets can be supplied to the software using BPF; this can avoid copying "uninteresting" packets from the operating system kernel to software running in user mode, reducing the CPU requirement to capture packets and the buffer space required to avoid dropping packets.