Airport Base Station "Dual Ethernet" Internet Fail

I have Optimum Online (aka Cablevision).
When I connect directly to the cable modem with an ethernet cable, I have internet.
When I connect the modem to the Airport, the lights flash in tandem so I know there is a connection. But even though my computer shows that I'm connected to the Airport, I can't get internet on my computer.
I've been messing with this for a while, reset the base station with Airport Admin Utility for Graphite and Snow. No luck.
Anyone? Thanks.

It looks as though you need to make the cable modem forget the computer and start afresh with the base station.
Shut down all network computers and power down the base station. Then reset the cable modem with its reset button if it has one. If it doesn't have a reset button, disconnect its power (possibly including batteries). Then start up the devices, waiting 5 minutes before each one, in this order: modem, base station, computer.
If that doesn't work, you might need to power down the modem overnight.

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