multiple interface

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http://www.linuxforums.org – hi .. can somebdy please help me...im using UBUNTU 7.1 server edition. i hav two systems with two wireless cards each( in sys A:A1 and A2) and (sys B:B1 and B2) i want to block the mac address so that my system knows which interface should block which interface. for ex A1 should block B1 and A2 should block B2 for blocking single interface i use iptables -t mangle -I PREROUTING 1-m mac --mac CC:CC:CC:CC:CC:CC -j DROP but i need the comand to specify the source mac and destination make both.... pleez if somebody can help me....:( (HowTos)