Title

IP forwarding for IPv4 must not be enabled, unless the system is a router. (Cat II impact)

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

Additional Identifiers

Rule ID: SV-38186r1_rule

Vulnerability ID: V-12023

Group Title:

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.