Apple has added a new article to the Knowledge Base regarding the use of AirPort Extreme base stations to create a wireless distributed network. Appleis Knowledge Base (sometimes referred to as the KBase) is a central location for all of Appleis support documents and other important information.
With the original AirPort base stations, multiple base stations in an area had to each be their own network. With the advent of the new AirPort Extreme base stations however, multiple base stations in an area can be combined to form a single, large network. The new KBase article has the instructions on how to set it up:
AirPort Extreme: How to Use Multiple Base Stations to Create a Wirelessly Distributed Network
You may set up a wireless distribution system (WDS) consisting of two or more AirPort Extreme base stations. The WDS scheme is similar to a wireless bridge, but also includes additional abilities.
You can set up two or more AirPort Extreme base stations as a wireless distribution system (WDS). This allows client computers to share a single Internet connection on a unified network. One main base station may share its Internet connection with up to four remote base stations. Each remote base station must be within transmission range of the main base station, as depicted in Figure 1.
The rest of the article includes detailed instructions, including illustrations and screen shots. You can read the full Knowledge Base article at Appleis Web site.