Can't network airport computers

3 macs are connected to internet via airport, but can't see each other or any ethernet macs. 2 macs are connected via ethernet hub - they can see & connect to each other and the airport macs.
connection is Fios to airport extreme to 4 port ethernet hub
at one time this setup worked with all macs seeing and talking to each other

Here are some ideas and questions.
1. Make sure that the DSL or cable modem is connected to the Snow's WAN port, not its LAN port.
2. Are all 5 computers connecting to the network wirelessly, or are some connected via Ethernet? If via Ethernet, what is your network structure?
3. Can all the computers not only "see" your network, but join it? (Does a check mark appear next to the correct network name in each computer's AirPort status menu?)
4. Can both computers that can connect to the Internet do so simultaneously?
5. Check the IP address of each computer when all are joined to your network. Do they all have the form "10.0.1.x"? This is expected if each is obtaining an IP address via DHCP from the base station.
6. Are the balky computers MacBooks and/or MacBook Pros? Note that this month Apple came out with an AirPort Client Update for MacBook and MacBook Pro, which is intended to address an AirPort performance issue while running on battery power under Mac OS X 10.5.8.

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    Message was edited by: rccharles

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