implementation of bpf

[Anton Alin-Adrian]

niraj kumar wrote:

>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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