TC and Netopia DSL Modem

I set up my TC today as a replacement wireless connection for my D-Link wireless router. Everything configured as I expected. The only glitch is that I am only able to access the internet on one computer on the network at a time, if I try to access the internet on another computer, I have to release the connection. (This was never an issue when the D-Link was active as my wireless hub).
Upon looking at my DSL modem configuration page, I see the following statement:
"This modem will allow only one active Internet connection at a time. When the connection is in use and another attempt is made to access the Internet from another computer, the modem will ask for a logon password to switch the connection to the computer making the request."
Is there a TC setting that I am overlooking that will allow me to access the internet from multiple computers on my network simultaneously?
Thanks.

It sound like maybe you have the TC in bridge mode - which is a least one way you would see the symptoms you report.
In the Airport Utility -> Manual Setup -> Internet at the bottom is "Connection Sharing" If that is set to "Off (Bridge Mode)" I think that's your problem.
A good resource is:
http://manuals.info.apple.com/en/DesigningAirPort_Networks10.5-Windows.pdf
In the section starting on page 24 and particularly on page 29 the alternatives are discussed.

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