When I hook up an ethernet connection from my Comcast modem to my mac pro and PowerBook G4 I end up getting an self-assigned ip address (169.254.x.x). When I hook up an ethernet connection to my Dell Dimension desktop from the cable modem I have no problem getting online. I have shut off the modem at various times from 30 seconds to 4 minutes before I plugged it back in with the same result on the Macs. I would love to hook up my Airport Extreme to the cable modem but I would be happy just to get this resolved first. Once or twice I was able to get an 192.168.x.x ip address on the mac's before it switched to 169.254.x.x. Any suggestions to get this resolved would be appreciated. Thanks for looking.