IP forwarding

However, for firewalls using multiple interfaces, ensure that you disable the TCP/IP protocol feature IP forwarding. IP forwarding is actually a router rule that allows traffic from one interface to traverse to another interface without needing to move any further up the protocol stack than where IP resides. In many cases, IP forwarding allows packets to bypass filtering. If you’re using the system as a firewall, be sure to disable this feature.


(Stewart 316)
Stewart, J. M. Network Security, Firewalls and VPNs, 2nd Edition. Jones & Bartlett Learning, 07/2013. VitalBook file.
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