I need some help for controll access in lan.

I need some help about networking......please read the
following if u have some idea about computer
then send me a suggession if possible......

Name: controll access in lan.
Description :there are some machines in lan .all that
we have to do is to denied internet connection to some

machines.the proxy server will maintain a table which
contains the ip address of machines to whom internet
connection will be denied.it will scan all the
packets, if the sourse ip address belongs to that
table it will discard the packet.the enviornment is
I want to know: what is the linux enviornment support for knowing the ip address (of the sourse also destination) of the incming packets.

and also if it is possible to give some more details of how to do it then please reply positively...

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