If you have Netgear router
1. Type Ipconfig in command prompt
2. copy default gateway, by right click "mark" and highlight then press enter.
3. Put that into web browser.
4.Log in
5.Click basic settings
6.select MAC address change MAC address by 1 number (can be anything)
7.Apply
8. Turn off router and remove power from modems for 30 sec
9. Turn everything back on
10. Success?