IP Forwarding

External

• http://www.ducea.com/2006/08/01/how-to-enable-ip-forwarding-in-linux/

Internal

• Linux Network Concepts

Overview

"IP forwarding" is a synonym for "routing." It is called "kernel IP forwarding" because it is implemented in the Linux kernel.

A host that acts as a router has multiple network interfaces. If traffic comes in on one interface and its target subnet is serviced by another network interface, the kernel may forward the packet between interfaces, if it is configured to do so.

echo 1 > /proc/sys/net/ipv4/ip_forward