How to enable routing in Mac OS?

Hi Community,
for a server migration I need a Mac as a router. I've two NICs in a PPC G5 and I want to connect two networks over this machine. From Linux I know that the kernel must support the routing functionality and IP forwarding must be enabled. How does it works in Mac OS 10.4.x or 10.5.x?
Thanks in advance & Bye Tom

You may need to enable ip forwarding. Its disabled on my system.
$ sysctl -a -- | grep forwarding
net.inet.ip.forwarding: 0
net.inet.ip.fastforwarding: 0
net.inet6.ip6.forwarding: 0

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