Need help to get around MY WEAK ISP

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i have an paid working line @ my home using a cisco dpc2100r2 and now i have a netgear cg814ccr v2 with haxorware on it .

i tried to use the netgear buy using the mac of the cisco and it got successfully connected

but as soon as i connect the cisco it gets disconnected

i understand that my ISP is using just the mac to authenticate the CM.
but as 2 same macs come online it just stoppes providing ip for the mac or just restarts my modem .

and i noticed that the config file name in the haxorware overview page changes every time except its size .

So what should i do to get two modems online @ same time

You can't used 2 modem on the same node with the same mac, you of to scan out side of your node for valid mac.