Disable ping responses from my system?

To configure a Red Hat Enterprise Linux system to not respond to a ICMP (ping), run the following command as the root user.

echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_all

To make the changes persistent across reboots, add the following line to your /etc/sysctl.conf file.

# Ignore all to ICMP (ping)
net.ipv4.icmp_echo_ignore_all = 1