Internet connection sharing through a Broadcom Router .

This was my previous set up .
3 computers connected to a hub . ( computers are dual booting Fedora / XP )

One of the computers connected to a Huwaei MT 882 modem and through another NIC to the hub .
On this computer I had the setting Internet sharing set to share this computers Internet connection .
The setup worked fine ..
I wanted to use Wi-fi on a laptop so I replaced the modem with a Beetel 451 BX ADSL2+ Router.
This uses the Broadcom 96388 chipset
This has 4 ethernet ports .
So I connect 3 computers to 3 ports .
THE PROBLEM
I can connect each computer individually ... BUT I cannot get the Internet working on ALL..
Is there anything I can do . I would like to avoid using the previous hub ..
Have tried for days trying various settings on the router no luck .. This is accessed through a browser
URL http://192.168.1.1

If you're dual-booting this could cause some issue with the internet getting through. Also, I'm not certain the 96338 Chipset will allow more than one machine, dual-booting, to be connected. It depends if the Fedora version is 6 or 10 and if it's long term support. However one thing I found from googling is this:

You need to enable NAT on the router. Go into the 192.168.1.1 address and enable NAT on the router.

Also, be sure to run all your updates on the machines.

Thank you .. The internet connection does not get through but I can see the machines connected in XP network places.

Anil