Questions about Packet Filter

L.C. (lc001@yahoo.com)
Wed, 20 May 1998 14:26:27 -0700 (PDT)


Does Linux support BPF in BSD systems?

Are the BPF devices capable of "intercept" packages passing through
them?

I mean is it possible that after it intercepts the outgoing package it
can modify the package contents(e.g. destination port) and inject into
NIC? Or, modify the package contents when intercept the incoming
packages and poll them back to the higher level protocols or
applications?

Thanks for your time,
Carl

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