There is a wide difference between ISP's. My ISP in Canada uses the MAC id of the connecting device. To conect, we must realease the IP address before disconecting the router, connect the modem to the pc's NIC, then do ipconfig renew. If we mess it up, ther is no recourse but to telephone the ISP and ask them to release and renew. You gotta go through the same routine in the inverse--or, clone the NIC MAC address in the router before connecting it to the modem.
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