iptables -A INPUT -s 127.0.0.1 -p icmp -j DROP

[SS] The above is the original page content for iptables, not very useful ;) btw, the
above command will create a rule to DROP every ICMP packet received with source address
of 127.0.0.0.1.

What is iptables? The firewalling framework of the Linux kernel version 2.4 and 2.6, it
replaced [ipchains] present in <= 2.2 version.