implementation of bpf

[niraj kumar]

i want to know how to implement a simple bpf filter on the freebsd i am using bsd4.7 version and i know the instruction set of the bfp virutal  machine but i dont know how to implement that and to check whether that particular bpf is working or not so u could explain the functioning of bpf with example then i would be thankful to u 
 
           thank in advance
                                      
                      Niraj

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