Hi, I have a client who wants me to work on their Airport Express and networking equipment. He most likely wants me to extend the length of the network wirelessly. I setup one of these airport express at my house and had all sorts of difficulty because the device was pretty fickle on what it could or could not do. Simply remembering the LAN port was difficult in itself because they don't label it.
Anyway, I digress. This guy has an airport with integrated time machine hanging off his network that I don't believe is in passive mode. He has a linksys router at the (hooked up to TWC modem) point of entry. That right there is going to cause some problems because I know Linksys doesn't play nice with Apple networking when using something like Airplay. I finally swapped out the Linksys router at home for a Netgear router. Airplay on my Airport Express finally worked after that debacle.
Correct me if I'm wrong but I believe his best setup would be is to eliminate the Linksys and setup the Airport/Time Machine router in it's place. Then have airport express units set in bridge mode with them plugged into the ethernet drops through his large house and turn on their WiFi to extend the length of the WiFi network. Yeah? Also, can you bridge an Airport to Airport express wirelessly and still broadcast as an AP?