2 of 3 computers connected to the airport cannot connect to the internet

I have an airport extreme that is connected to the cable modem, and is set to distribute IP addresses using a single 10.0.1.1 etc.
All three computers, a ppc mac mini, a 12" powerbook, and the intel iMac are connected to the base station, and that is their only connection. the pb and the mini cannot access the internet through the airport, but they are assigned IP addresses, 10.0.1.2 and 10.0.1.3.
the intel mac has more info displayed than the airport, a real IP address, 216.195.... a different subnet, and a router #.
I am afraid to change the settings that I might lose the connection to online support on the intel mac, but am totally confused as to why it would have a different IP address than it is told to have by the aebs. I need to get all these computers online today.
I am also trying to connect a new epson aculaser cx11nf printer through the ethernet port in the aebs, and it is not acknowledging anything in the port. but that's another story, and i'll likely call epson for help later, but just in case someone thinks it's related.
Thanks in advance.

Mary, Welcome to the discussion area!
From the information your provided, it is clear that your Intel Mac is not connected to your AirPort Extreme base station (AEBS). It is connected to a neighbor's wireless network.
On the Intel Mac, go to the AirPort menu and select the name of your wireless network. Hopefully you gave the network a unique name.
Ensure that you have the cable modem connected to the AEBS's WAN port.
Power off the cable modem whenever you switch the Ethernet connection. This causes the cable modem to forget the device it was talking to. When the cable modem is turned back on, it will find the new device to talk to.

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