Airport Extreme & MacBook & MacBook Pro: only one can talk to Airport

I've got an Airport Extreme is in bridge mode and hooked via an ethernet cable to an SMC router. The SMC device is a wireless (and four wired ethernet ports) router. It's attached via ethernet cable to a DSL modem. All the settings on the Airport Extreme are for the it to be connected to a router and DCHP. I've also got two Airport Expresses to extend the range of the Airport Extreme. I have a Canon printer attached to the Airport Extreme.
In our home we have a black MacBook (10.5.6), a MacBook Pro (10.4.11), Pismo PowerBook (10.4.11), an Apple TV, an iPhone and wireless security web cam.
The problem is that either the MacBook or the MacBook Pro can go through the Airport Extreme to the internet. If the MacBook can go through the Airport Extreme, then the MacBook Pro cannot. If the MacBook Pro can go through the Airport Extreme, then the MacBook cannot.
All computers can get to the Internet via the SMC router wirelessly at the same time.
The Pismo, Apple TV, iPhone and web cam have no problem going through the Airport Extreme to the internet regardless of what's going on between the two MacBooks
No matter what, wireless printing works for all computers.
The MacBook is a "clone" of the MacBook Pro. Internet sharing is on for both MacBooks. Both have unique AirPort ID numbers.
After powering down the DSL modem, SMC router and Airport Extreme and then restarting everything (MacBooks, Airport Extreme, DSL modem) the first MacBook that I use to connect to the Internet always work and the other one never works.
I would like both MacBooks to be able to access the internet via the Airport Extreme.
What is the problem and what is the solution? Any help will be greatly appreciated.
Note: This is a long (years) and ongoing problem and I've posted (over a year ago) before with no luck.

Hi,
"Internet sharing is on for both MacBooks." Why is that? Try to disable Internet sharing on both.
Furthermore I understand that your SMC device is wireless enabled too. Make your configuration more simple by disabling that. Your Airport Extreme can handle that since it is bridged.
See if we can get somewhere.

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Airport Extreme & MacBook & MacBook Pro: only one can talk to Airport

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