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

From MAC OSX 10.6 Workstation Security Technical Implementation Guide

Associated with IA controls: ECSC-1

Associated with: CCI-000366

SV-38186r1_rule IP forwarding for IPv4 must not be enabled, unless the system is a router.

Vulnerability discussion

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.

Check content

Open a terminal session and enter the following command. sysctl -a | grep net.inet.ip.fw.enable If the value of "net.inet.ip.fw.enable" is not set to "0", this is a finding.

Fix text

Open a terminal session and edit the /etc/sysctl.conf file and add the following line. net.inet.ip.fw.enable=0 NOTE: If the sysctl.conf file does not exist use the following command to create one. touch /etc/sysctl.conf

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