AEBS Firewall - OSX Firewall

Through my SysPrefs/Sharing I currently have the OSX (10.3.8) software firewall turned OFF. My cable modem is connected to the AEBS WAN port and the G5 is connected to the LAN, the iBook has the Airport Extreme card.
It was my understanding that because the AEBS has a hardware firewall, the use of the OSX software firewall wasn't necessary and can cause conflicts if used with the AEBS firewall.
In the SysPrefs/Sharing of both the iBook and G5, under the Services & Firewall tabs, Personal File Sharing is the only option I have checked. I don't have any entries in the Port Mapping section of the AEBS' configuration.
The only file sharing I really care about is between my G5 and my iBook, allowing others access to public folders is not a concern and I'd just as soon not allow it if I can still have my G5 & iBook sharing files.
I'm not really clear on the proper uses/functions of the Services and Firewall sections under the Sharing preferences, can someone set me straight and let me know if I should have it configured differently for the way I'd like it to work?
Thanks.
Patrick

The AEBS has NAT or Network AddressTranslation which hides the Internet Protocol address of each computer behind the router while still allowing all these machines to send and receive data from the Internet.
NAT is integral to safe computing, but it's not a firewall -- it can't prevent a malicious code on your machine from "phoning home" to another site.
Many consumer wireless routers now offer a hardwall firewall in the form of
Stateful Packet Inspection Firewall (SPI). SPI monitors both incoming and outgoing packets and will block either that are not in response to a specific request.
SPI adds additional security but must be customized for each set up and if done incorrectly makes you less secure.

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