* Codex Chen ([EMAIL PROTECTED]) wrote:
> 
>       and have a filtering program looking after this table
>       to decide if the packets though the Linux/FreeBSD could
>       pass or not. Even the MACs of NICs are in the table,
>       but if the corresponding IPs are not as listed on the
>       table, the packets may not pass.

You could do this with a set of iptables commands looking something
like:

iptables -A VALID_LIST -i eth0 -s 192.168.1.1/32 -m mac --mac-source 00:00:00:00:00:00 
-j ACCEPT
...

etc, etc.

        Stephen

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