Hi, I want block forwarding as follows : "iptables -I INPUT 1 -i eth1 -p tcp -m tcp --dport 25 -m mac --mac-source 00:08:A1:53:BE:71 -d ! 10.0.0.2 -j DROP" it does not work but when I try to do same thing with rule "iptables -D FORWARD -i eth1 -p tcp -m tcp --dport 25 -s 192.168.0.42 -d ! 10.0.0.2 -j DROP" Is there any sytax error. Or Do I have to installed any additional module of iptables. I am using Redhat 9.0 Linux. Please guide me. Thanks for support. __________________________________ Do you Yahoo!? Take Yahoo! Mail with you! Get it on your mobile phone. http://mobile.yahoo.com/maildemo