I am just setting up my first AirPort Base Extreme. I'm connecting to my ISP through a cable modem with a dynamic IP address (NTL). The problem is that, while my AlBook is working perfectly through the airport card, the iMac, connected through ethernet, does not get a viable IP address. The iMac gets a self-assigned Ip address that is suitable to let the 2 computer see/connect each other, but does not work for the internet connection. In the base station I've left unchecked the 'Distribute IP address' option (if I check it, I get in both computer the new IP address but I loose the connection to internet for both) The iMac is set to use DHCP thanks in advance, Silvo Silvo Conticello Albook 17" 1.5GHz/1.5Gb RAM/80Gb HD/OS10.3.9 iMac 1GHz/500Mb Ram/80Gb HD/OS10.3.9/17" display Cambridge UK