Wireshark · Wireshark-users: [Wireshark-users] Getting traffic from entire network

[Trevor Bosaw <bosawt@xxxxxxxxxxxxxxxx>]

Hey,

I am currently doing research using Wireshark to detect packet data.   
Up to this date I have been doing this all on a single computer.   
Instead I would like to collect more 'real world' data, and receive  
packets from all of the computers on my network.  Is this possible?

It is a small network, with only a single modem connected to a single  
wireless router (an Airport Extreme).  There are about a dozen  
computers connected wirelessly to this router.

I guess my question is, is there some way to set a computer connected  
to the router or modem that can run wireshark and capture the traffic  
from all of these computers on the network?  I have thought of  
possibly somehow connecting the modem to my computer and then my  
computer to the airport extreme, and bridging the connection or  
something, but I am not sure how to do this (especially since there is  
only one ethernet input on the computer).

My budget is fairly high, so if there is something else I need to  
purchase to do this, that is a possibility.

-Thanks