firewall ¬ router

["MANUEL GARCIA-CERVIGON" <mgarciac () ac upc es>]

I need to build a firewall as soon as posible. But, I've got a big
problem...
   we have private IP addresses  in
network (192.168.1.0/24) and one cisco router to pass through our internet
traffic making NAT.
   I plan to put a unix system's firewall (netfilter) in my local network to
protect
my several servers and split the actual network into 3 networks
(192.168.1.0/24) ,(192.168.2.0/24) ,(192.168.3.0/24)
When I install the firewall, will I have to do nat in the firewall or in the
router?how?
Thanks,

The skeme is below:
-------------         -------------         ----------------------
| Router | ------ | Firewall | -------| Local Network|
                                    --------    | Local Network|
                                    --------   1Local Network|

-------------        --------------         ----------------------

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