How do I configure airport to keep IP addresses from changing?

This is my configuration:
I have an Airport Extreme and 2 Airport Express. The Airport Extreme is connected to a hub, and the hub to the cable modem.
One item connected to the hub is a weather station which continually pushes localized weather info out to several servers. My problem is that occasionally airport changes the IP address of the weather station and the weather program on my Mac stops receiving input because in it's configuration, it is looking for a specific IP address to receive input.
Right now the AE has a "standard" configuration. That is, an Ethernet (using DHCP) connected in bridge mode. I am not knowledgable enough on the airport utility to put in any special configuration in fear of screwing the whole network up.
My question: Is there a way to manually assign an IP address to the weather station (which has a MAC ID) to keep it from changing? If so, how?
Thanks for any help.
Jeb

Sure, I can go to the ISP for a static IP but that is extra $$.
Please check my reply again. I suggested that you configure your modem/router.....the Speedstream....to provide a fixed IP address for the weather station. I did not suggest that you ask your ISP for a fixed IP address to be able to connect your network to the Internet. You do not need to do this.
Right now, your Speedstream modem/router is configured to handlle the DHCP and NAT services on your network. In other words, it is the "main"router tht handles all IP addresses for devices on your network.
In the internet connection page on my AE where right now it is in bridge mode why can't the airport connection be changed to "share a public IP" instead of bridge mode?
A word here about basic networking rules. If you configure the AirPort Extreme to "Share a public IP adress" it will be set up as a second router handling DHCP and NAT services.
But, you already have another device doing this....the Speedstream. You only want one device configured as a router on a home network. You never want two devices both trying to act as routers on a network.
Any other "routers" must be configured in Bridge Mode to allow everything to work correctly. So, Bridge Mode is the correct setting for your AirPort Extreme.
If you try to configure the AirPort Extreme as another router, you will have IP address conflicts and a condition know as Double NAT. Not good. The network will not function correctly.
Suggest that you check with Speedstream support to ask them how to assign a fixed IP address to a device on the network. Since the Speedstream is your main router, it must be the device that handles this.
In Bridge Mode, the AirPort Extreme simply passes through the network information that it receives from the Speedstream modem/router. It is not your "main" router. The Speedstream is calling the shots on your network, so it is the device that must be configured to provide the fixed IP address to the weather station.

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