Hi, I installed latest vesion of iptables and pom from www.netfilter.org . They were installed and kernel was compiled sucessfully. all modules are loading properly. I just added three rules in nat table prerouting chain .and i am getting same error iptables: Invalid argument 3 times. rules are as follows $IT -t nat -A PREROUTING -p TCP -i $INET_IFACE -d &INET_HTTP --dport 80 -j DNAT --to $DMZ_HTTP $IT -t nat -A PREROUTING -p TCP -i $INET_IFACE -d &INET_DNS --dport 53 -j DNAT --to-destinaion $DMZ_DNS $IT -t nat -A PREROUTING -p UDP -i $INET_IFACE -d &INET_DNS --dport 53 -j DNAT --to-destinaion $DMZ_DNS KERNELVERSION -> 2.4.20-8 IPTABLES -> 1.2.9 "I DOWNLOADED BUT AFTER COMPILING IT SHOWS IPTABLES-1.2.7a" PATCH-O-MATIC ->20030912 Please try to help me. I'll be really thank full to you Madhav __________________________________ Do you Yahoo!? New Yahoo! Photos - easier uploading and sharing. http://photos.yahoo.com/