To configure a Red Hat Enterprise Linux system to not respond to a ICMP (ping), run the following command as the root user.
To make the changes persistent across reboots, add the following line to your
echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_all
/etc/sysctl.conf
file.# Ignore all to ICMP (ping)
net.ipv4.icmp_echo_ignore_all = 1