Extreme blocks out ethernet computers for file sharing.

Gentlefolks,
I am very hopeful I can get a solution suggestion for my issue. I don't know networks very well.
I get on the internet via DSL modem to a 2wire <something> that runs into a internet hub (switch it seems to be called now!) I have three Macs that are hard wired to the hub with the 2wire <something> providing addresses using DHCP. I have an Airport Extreme base station (the dome shaped guy) running connected to the hub using the LAN, not the WAN, connection on the base station.
I use a Macbook Pro on the network fine. When I take it to wireless, it can get to the internet just fine. I can even print using Appletalk. BUT,,, I can not see any of the other computers that are on the ethernet for file sharing. If I just connect up my ethernet on the Macbook then everything works just fine. Using the wireless shuts out the other machines.
Any suggestions?

A switch may or may not have an uplink port. IMHO uplink ports are outdated and not really useful since most devices have auto-sensing Ethernet ports.
A hub routes all traffic to all ports. This means that devices see a lot of traffic which is not for their use. Think of it like the old telephone party lines where you could hear anyones conversation because it was broadcast to everyone.
A switch is an intelligent hub. It knows what devices are connected to what port and routes traffic destined for a device ONLY on the port to which that device is connected. Therefore a switch reduces the traffic on any given port. Think of it like today's (private) telephone lines where you only get the calls which are for you and you can't hear calls made to your neighbor.

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