1. When EVER you change a DEVICE that is right behind an ISP modem you MUST turn the modem OFF!!!
2. Leave the modem OFF for at least three minutes!
3. Connect the new device to the modem and turn that device to on.
5. After the three minute wait turn the ISP modem back ON!
The ISP modem then will send the new
MAC Address to the ISP server port. The Server will NOT auto-sense a new MAC address that is connected to it. So you must force the ISP modem & Server to search for a new MAC address.
So just turn off you ISP modem for three minutes and turn it back on. The ISP modem will dish out an IP to the Extreme's WAN port.