How about this:
Deactivate the DHCP server in the ActionTec.
Connect the WAN port on the Linksys to the ActionTec (with crossover cable if need be). Assign one of your real static IP addresses to the WAN interface (on the Setup page).
Configure the Linksys with a non-routable address on its "internal" interface in the "LAN IP Address" field on the Setup page.
Put the Linksys back into gateway mode. Activate its DHCP server and assign it a block of addresses to dispense on your non-routable subnet.
Connect the uplink port on the LAN side of your Linksys to the ActionTec (like it is now).
Keep your G4 configuration the same as it is now.
What this does is give you two different subnets on what is effectively a single ethernet segment. The static IP information on your G4 makes it participate in the subnet that your DSL provides. The DHCP addresses dispensed by the Linksys will put your laptops and other wireless machines on the non-routable subnet. If you want to put another machine on the internet, just configure it to be on the public subnet like you did with the G4.
I am guessing that your Oracle server does not have wireless. This configuration does not give your Oracle machine internet access.
