Hi, I just had a linksys b router with a 4 port switch installed and to usually get a valid IP address starting with 192. I have to unplug the wireless router for around 30 seconds and replug in. This resets the address my ibook gets. Usually has a 168. address which doesn't work. I'm new to this stuff but I'm guessing it's the router or the primary computer it's set up to (windows desktop). Any suggestions for settings changes, hardware changes, downloads or anything else? Thanks. P.S. I will hit the renew DHCP lease when I get the invalid IP address and it wont give me a new address. Only when I have a valid one will hitting that button give a new address, which has always been another good one.