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


Overview

Finding ID Version Rule ID IA Controls Severity
V-12023 GEN005600 SV-46114r1_rule Medium
Description
If the system is configured for IP forwarding and is not a designated router, it could be used to bypass network security by providing a path for communication not filtered by network devices.
STIG Date
SUSE Linux Enterprise Server v11 for System z 2016-12-20

Details

Check Text ( C-43371r1_chk )
Check if the system is configured for IPv4 forwarding. If the system is a VM host and acts as a router solely for the benefits of its client systems, then this rule is not applicable.

Procedure:
# cat /proc/sys/net/ipv4/ip_forward

If the value is set to "1", IPv4 forwarding is enabled this is a finding.
Fix Text (F-39455r1_fix)
Edit "/etc/sysctl.conf" and set net.ipv4.ip_forward to "0". Restart the system or run "sysctl -p" to make the change take effect.