Thanks for the suggestions, Bruce. We tried them with no change in the
situation, if we in fact did what you meant (we're not too techie
around here).
Here's what we did. First we went to the Macbook's Airport prefs and
disabled the IPV6, whatever that is. It made no difference. The other
Macs could still see the Macbook but couldn't connect to it, and the
Macbook still couldn't see any other Mac. Then we restarted the
Macbook, to see if it made any difference after starting up with IPV6
disabled, but it did not. In either case, with or without IPV6, the
Macbook could still get on the Internet wirelessly--it just couldn't
see the other computers.
Then we disconnected the Ethernet cable that runs from the modem to
one of the G5s, and plugged it into the Macbook instead. (This also
took that G5 offline, so that there was only the other G5 and the G4
on the LAN, just in case having four computers in the network was one
too many for some carrier-imposed reason, as you suggested.) The
results were the same. The other two Macs could still get on the
Internet, could still see and connect to each other, and could still
see the Macbook but not connect to it ("Connection failed"). The
Macbook could also still get on the Internet, while not detecting the
other two Macs. We tried turning off Airport in the Prefs, leaving
only the Ethernet connection to the modem, but nothing changed that
way either. All same.
Then, with the Ethernet cable still connected to the Macbook, we
restarted the Macbook in Safe Mode. While in Safe Mode everything
remained the same: all three Macs can get on the Internet, the G5 and
the G4 can see and connect to each other, and they can see the Macbook
without being able to connect to it. The Macbook, on the other hand,
sees no other computer, but it can get on the Internet.
In short, we're right back where we started, no matter what we do.
Is there anything else we might try, or should we just be resigned to
the fact that one of our four Macs just doesn't want to play with the
other three?
Tom
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