about ipfwadm in Linux

[quito @ constructa . cl (Francisco Javier cabezas)]

I need to know something about IPFWADM....

What are "the blocking rules", "the forwarding rules" and 
"the IP accountting rules " ???
        What's the mean ?

                Thanks for all.

                        Quito.
                                    +-------------------------------+
                                    |  Francisco Javier Cabezas V.  |
                                    |   Desarrollo y Soporte Unix   |
                                    |           quito @
 constructa .
 cl |
                                    +-------------------------------+