I have a wireless network based on a Time Capsule (802.11n, first generation). As wireless connectivity is rather bad in one part of the house I wanted to use an Airport Express (802.11g) to extend the network. The end result should look somehow like
Internet Router <--LAN--> Time Capsule <--WiFi--> Airport Express
with the Time Capsule and the Airport Express both running in the same WiFi network.
Based on the documentation I found (e.g. HT4262) I assume I should create a WDS network but this somehow doesn't seem to work (the Express disappears from Airport Utility as soon as I define it as a WDS relay/remote base station).
So how do I have to configure the network in both the Time Capsule and the Airport Express to get this to work?