The system must not respond to ICMPv4 sent to a broadcast address.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-38535	RHEL-06-000092	SV-50336r1_rule		Low

Description
Ignoring ICMP echo requests (pings) sent to broadcast or multicast addresses makes the system slightly more difficult to enumerate on the network.

STIG	Date
Red Hat Enterprise Linux 6 Security Technical Implementation Guide	2014-06-10

Details

Check Text ( None )
None

Fix Text (F-43483r1_fix)
To set the runtime status of the "net.ipv4.icmp_echo_ignore_broadcasts" kernel parameter, run the following command: # sysctl -w net.ipv4.icmp_echo_ignore_broadcasts=1 If this is not the system's default value, add the following line to "/etc/sysctl.conf": net.ipv4.icmp_echo_ignore_broadcasts = 1