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