Does anyone know if its possible to use a 2600g to connect to a cable modem instead of using it for an ADSL connection?

I have a very old belkin cable router connected to our cable modem at the moment but it cant handle speeds above 2MB. I have a 10MB line and want to use the 2600g as the DHCP server in my house.

I managed to get it to connect to the modem, and it picked up the local/secondary dns servers but it wouldnt pick up the wan ip. Im sure its possible, but cant find any info on how to do it?

Anyone have the knowledge?

No it is not practically possible. I seem to remember there was a thread a long time ago which gives a method of doing it, but it was cumbersome and unreliable.