How to access second network ?
 

I have 2 linux boxes hardwired into my non-wireless router, on the 192.168.0.x network.

One of them (box #2) has a wireless card, which is connected to a different network 192.168.2.x

How can I access the wireless network from box #1? (for example so that I can ping 192.168.2.x from box #1)

Hi, you will be able to change the subnet on both computers to 255.255.0.0 and they will then be able to see each other i.e. ping.

then you will need to enable packet forwarding on the box with the wifi, that depends on your distro to how it is done

Slim Pikins