Wireless best practices

[FoulDragon at aol.com]

I'm having cable put in, so I wanted to make sure my ship was as tight as 
possible first.  Up til now, aside from a disasterous attempt to share a 56k 
connection, the network has been for file and printer sharing only.

Current Network configuration:  Two desktop PCs on wireless, one networkable 
printer via Ethernet.  Possibly an on-again-off-again wireless laptop.

Right now, I suspect IP numbers are being assigned by DHCP

The router/hub/waffle iron is a Linksys WRT54G version 2.  Apparently very 
popular.

The network configuration:
-Two desktop PCs with $19 802.11g PCI cards.  Likely peak configuration will 
be four desktops.  These PCs will be running Windows (2000 SP4 / XP 
gold-master / 98SE o.O) at least part time.

-One, possibly worst-case two laptops with 802.11 cards.

-One HP LaserJet 5, hanging off Ethernet.

Wireless security in place:

WEP with a 112-bit key.  SSID changed from the default.  SSID broadcast 
disabled.  MAC filter set to "allow specific cards only" and filled in with the two 
PCI cards and one prehistoric PCMCIA 802.11b card I have in my near-dead 
laptop.

Is there anything else I should be doing to keep wardrivers at bay?

And how do I set the WRT54G's firewall, both in terms of where are the 
controls and what are reasonable values?

Or is it moot and the "default" Cox modem the bloke is bringing also 
supplants the router?  If so, are there a specific list of best practices for that 
setup?
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