At school, I use an old Linksys b router to connect my PC and my MBP. However, whenever I connect to my network, Airport is always lit yellow and says "Airport has a self-assigned IP address and may not connect to the Internet." I have tried connecting to my network with other MBP and MB, and neither of them seem to work. However, I am able to connect to my network on a laptop running XP/Vista. My router has the exact same setup as last year, I haven't changed anything. I tried to manually assign an IP address, 192.168.1.1 for the router and 192.168.1.101 for my IP, to no luck. I ran Network Diagnostics multiple times. One try, I restarted my router and Airport seemed to work. But after I closed my MBP and opened it a couple of days later, I had the same problem. My MBP connects to my home router fine. It is a standard router given to me by Verizon FiOS. Is this problem from an update by Apple?