I'm setting up a home network with an Airport Express for a couple of friends of mine who both have PowerBooks. I want to use fixed IP addresses for the PowerBooks so I can administer them remotely (sometimes it's a real pain knowing about computers isn't it? friends call you up all the time etc. etc. etc.... but that's another story). Aaaaaaaaaaaaaaanyway, I've tried setting their powerbook network airport TCP/IP settings to "DHCP with Manual IP" and using 10.0.1.2 & 10.0.1.3 as the IP addresses, but when I use that their internet connection drops, even if I'm using the address that Airport Express gave them in the first place. This is also true if I change them to previously unused addresses like 10.0.1.4 and so on. I've tried changing the settings on the Airport Express, like the number of IP addresses it gives out and so on, but nothing seems to work. It seems that there are a few people who've had the same problem but received no response, some from this site... http://forums.macrumors.com/showthread.php?t=147989&highlight=airport+manual ... and some around the internet as I've been trawling for the solution. I've been able to replicate this problem at home with my Powerbook and Airport Extreme, so it's not just their setup, or their Powerbooks, or just Airport Express. It seems strange, given that the Airport Express is on default settings, and they've only just got their Powerbooks - shouldn't these things just work?! Any help gratefully received...  Just found this, which I suppose might help, but I've tried doing what this guy did and it didn't work for me... http://forums.macosxhints.com/showthread.php?s=&threadid=44177 ... and I don't understand why I should have to specify the DNS settings when all I want is to get a manual IP. When I try what he did, rather than saying I don't have a connection it just sits there as if it's looking for the website, whether I use the Airport Express for DNS (which seems a strange setting anyway) or my ISP's DNS servers.