Thanks Peter and Scott! Yes, it was the cable modem. I forgot to restart it after starting the router! Now, I have more questions: - after setting up the Airport base using the AirportAdminUtility from the AlBook, the base station has disappeared from the AirportAdminUtility, it appears in the AirportManagement utility, but it is not accessible. But it is fully accessible/administrable from the iMac. Why? - is there any way to access the Airport base firewall? Silvo Silvo Conticello Albook 17" 1.5GHz/1.5Gb RAM/80Gb HD/OS10.3.9 iMac 1GHz/500Mb Ram/80Gb HD/OS10.4.1/17" display Cambridge UK