Wired and wireless network problem

I have an Airport Extreme setup with an 20" imac connected thru ethernet. I also have a 17" Macbook Pro connected wireless. Both have no problems connecting to the internet but I want to be able to talk to each other. I checked and the wired network has a different subnet then the wireless one. I would like to have them both on the same subnet but I can't seem to find a setting in my airport extreme that will allow me to change that.. The wired network seems to be the same subnet as the assigned address from my ISP. I only have 1 address from my ISP so the airport is not acting like a switch it is routing the data just creating a internal network based on the ip from the ISP. The wireless is handing out ip address that I have setup in the DHCP section.
Message was edited by: Chadwick-P

Hmmmm
It sounds like you have your AirPort Extreme configured to be in bridge mode? Is this the case?
If it is the case, then you can configure it to "share a single IP address" and then both the wired 20" iMac and the MBP would get DHCP addresses on the same subnet....
If your Airport Extreme is already setup to share a single IP address then the two stations really ought to have IP addresses from the same subnet. Perhaps one of more of them has a static IP and is not setup to use DHCP?

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