My router has been working for weeks, but some strange things started to happen. This week, the router, which serves as a dhcp server for the internal subnet, and as a dhcp client for the cable modem, got this ip from the modem: 192.168.100.30. But the IP should have been a public IP I've never used this kind of range, never, my highest subnet was 192.168.17.0/24. I have no idea how the router could have received this IP. The external interface is connected to the modem....there is absolutely nothing special in the config. THere is a WDS, which is working perfectly (192.168.1.0/24) and 3 machines connected to the internal switch. After restarting the router, the IP was correctly detected by the dhcp client, a public IP. I've called the ISP, they have no idea and told me to call them as soon as it happens again. Is there a 192.168.100.0/24 range hard coded in the router ? Someone have an idea ? Note: the other problems I was talking bout could have been cause d by electrical problems (short glitch on the AC power, maybe). I'm thinking about 3 possibilities: 1) hacking (via wireless, but the WDS is protected by WPA and a strong password, but the admin pass was default :shame) 2) electrical problems: The house could have problems caused by very old wires. 3) ISP problem: They are migrating many customers to a new platform and are sending new cable modems to replace older models.