V-38535: The system must not respond to ICMPv4 sent to a broadcast address.
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Ignoring ICMP echo requests (pings) sent to broadcast or multicast addresses
makes the system slightly more difficult to enumerate on the network.

Details: `V-38535 in STIG Viewer`_.

.. _V-38535 in STIG Viewer: https://www.stigviewer.com/stig/red_hat_enterprise_linux_6/2015-05-26/finding/V-38535

Notes for deployers
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