Help with a Subnet mask solution?

This is probably obvious to many of your network guys/gals - but I'm stumped - I'm looking for an easy solution to this.
I have a Linksys wireless router WRT54GS - Comcast cable broadband - my MacBook wasn't staying connected to it so I plugged in my Airport Express to one of the Linksys ports via Ethernet and disabled the wireless on the Linksys.
Bingo - no more connection problem - the Linksys handles the wired users and the Airport Express handles the wireless - except - I have a network drive connected to the Linksys via Ethernet that my wireless users can't "see" - I believe - because it's on a different subnet mask.
Is there an easy way to "link" the two so my wireless users can see the wired network drive?
THANKS!

As both the Linksys and the AE act as normal switches with no routing functionality, you have one single subnet. So all you have to do is to make sure that all devices connected to the Linksys and the AE have an IP-address of that subnet and the same subnet mask.
Most routers have a class C private network configured by default. Let's assume, you have 192.168.0.0/255.255.255.0. If so, pick an IP-address out of the address range 192.168.0.1 to 192.168.0.254 for each device and use 255.255.255.0 as a subnet mask. For other class C private networks use the according range.
If you need to mix different class C networks (e.g. 192.168.0.x for your wired deviced and 192.168.1.x for your wireless devices) use a subnet mask of 255.255.0.0 on all devices.
Just for your understanding: when a machine A connects to a machine B, machine A takes it's own IP-address (e.g. 192.168.1.1) and ANDs it bitwise with it's subnet address (e.g. 255.255.255.0 would result in 192.168.1.0). Next it does the same again, with machines B IP address and it's own subnet mask. If both results are the same, both machines are on the same subnet, so machine A tries to connect machine B directly. If not, the machines are on different subnet, so machine A tries to connect to machine B using it's configured default gateway.
Hope this information helps at least a bit.

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