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Originally Posted by Stuart C
At&T showed a method that could be used for people on the outside of the router (the network end) to deduce how many computers are attached.. Will try a find a link to the paper they published, but IIRC it all hinged on how many types of traffic are being carried.
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When a PC makes a request for information the request has to tell the target where to send the response. Packet inspection can determine the address of the originating request. Monitoring data to and from a specific account can therefore determine how many different devices are connected to that account during the period of monitoring.