Hi, My network is like this comp_A (192.168.1.1 ) -----cross---comp_B(192.168.1.20) I implemented next rules ( just testing now ) on comp_B iptables -A INPUT -p icmp --icmp-type echo-reply -j ACCEPT iptables -A INPUT -p icmp --icmp-type echo-request \ -m limit --limit 1/s -i eth0 -j ACCEPT iptables -A INPUT -p tcp --syn -m limit --limit 1/s -i eth0 -j ACCEPT This should limit echo-requestes on one per second on comp_B. Then I opened 4 consoles on comp_A and issued ping 192.168.1.20 on all of them, and I got response for every icmp packet. Should above rules block all icpm requests, and accept only one per second? Did I forgot something? There is no any other iptables rules on comp_B. Thanks in advance. Regards __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com