IP forwarding for IPv4 must not be enabled, unless the system is a router.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-38511	RHEL-06-000082	SV-50312r1_rule		Medium

Description
IP forwarding permits the kernel to forward packets from one network interface to another. The ability to forward packets between two networks is only appropriate for routers.

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

Details

Check Text ( None )
None

Fix Text (F-43458r2_fix)
To set the runtime status of the "net.ipv4.ip_forward" kernel parameter, run the following command: # sysctl -w net.ipv4.ip_forward=0 If this is not the system's default value, add the following line to "/etc/sysctl.conf": net.ipv4.ip_forward = 0