[X4U] Airport Express network - iTunes

[Dale Satterfield]

I have a network composed of a DSL modem, connected to a hub, and some 
computers connected to the hub, as well as an airport express. I have a 
second airport express connected to my stereo system in a different 
room. I can stream music from my powerbook wirelessly with no problem, 
However, i cannot seem to stream music from the desktop unit connected 
to the hub, and through it to the airport express. How do I get the 
ethernet connected unit to see the airport express connected to the 
stereo ? It sees the one connected directly to the hub.
Thanks.