With the emergence of Napster in the fall of 1999, peer to peer (P2P) applications and their user base have grown rapidly in the Internet community. With the popularity of P2P and the bandwidth it consume, there is a growing need to identify P2P users within the network traffic.

Anonymous
The first paper regards peers with following traffic pattern as p2p pairs:
* traffic which source-destination IP pairs that concurrently
use both TCP and UDP during a speical time
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