I have a strange Problem with a RV220W firewall/router and a Thomson Cable Modem THG571!
When i connect the Router to the cable modem, i do not get an IP. BUT:
If i connect another Router (Fritzbox) to the cable modem it works! --> Internet acces and modem are ok
If i connect the RV220W to another modem (Thomson THG570) it also works! --> Router ok
Important: Both modems are connected to the same provider. I did not change a single parameter on the RV220W (Automatic IP, MTU=Default).
It must be a problem with the combination of the newer Thomson (THG571) modem and the RV220W.