Under the Network tab for my express in the Airport Admin Utility, I have it checked off to distribute IP addresses to airport client computers by "Sharing a single IP address (using DHCP and NAT)." How does this differ from distributing a range of IP addresses? I thought each computer had to have its own IP address, how can it share the same one? When both the iMac and ibook are connected, they show unique IP addresses in the Network Preferences pane. How is it sharing a single IP address?