Cannot Distribute IP addesses on new Comcast telephony modem

I recently switched to Comcast for phone and internet service. The modem provided does not distribute IP address. It will also not allow the base station to distribute IP addresses. If I set the base station to be an access point and not distribute IP addresses, the comcast network will only assign one IP address to one computer on the network. Comcast technical support of course says I have to call Apple for support. Is there a magic phrase to use on the Comcast tech support to get them to have their network distribute multiple IP's to me or allow the base station to act as a router? Is it a telephony modem problem?

Often you need to blank a modem to allow it to associate with a base station over the original computer connected to it.
Power down the cable modem.
Wait 30 minutes (go and have a cup of tea or something).
Connect the cable modem to the WAN port of the Airport Extreme Base Station (AEBS).
Switch on the cable modem.
Switch on the AEBS.
Wait five minutes.
Switch on the Mac.
Use the Airport Setup Assistant in the Utilities folder to configure the AEBS.
iFelix

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Cannot Distribute IP addesses on new Comcast telephony modem

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