Internet sharing from Airport to ethernet behind NAT router

[doowttam]

I just set up a Fedora box but don't have an easy way to connect it to the router over ethernet. And rather then buy a new wireless card I figured I could use my powerbook to share its internet connection through ethernet to my Fedora box. I was really happy, but not surprised, to see how easy it was to set up internet sharing. The problem is, I connect the fedora box to my powerbook through ethernet, and make sure that the powerbook is connected to the network, and nothing happens.

I'm using an NAT router, so its not like the powerbook is directly linked to the internet, which I've heard could be a problem. I'm running tiger on the powerbook and I have personal web, and internet sharing on. I've also made sure that its set to share the connection from Airport to ethernet.

How do I go about doing this?

 

[tg_barros]

The powerbook are in the same subnet mask of router?
Check the ip´s adress of the router, and check if the powerbook is well configured.
Ip adress
subnet mask
gateway (router ip)
Dns(ip that isp provides)