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

From Apple OS X 10.8 (Mountain Lion) Workstation STIG

Associated with: CCI-000366

SV-65525r1_rule IP forwarding for IPv4 must not be enabled, unless the system is a router.

Vulnerability discussion

Check content

To check if IP forwarding is enabled, run the following command: sysctl net.inet.ip.forwarding | awk '{ print $NF }' If the value is not "0", this is a finding.

Fix text

To configure the system to disable IPv4 forwarding, add the following line to /etc/sysctl.conf: net.inet.ip.forwarding=0

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