PolyTelecom.com

This Tech Report deals with Peer-to-Peer protocols. We start by giving a brief account of history of P2P applications and then cite from some of the P2P traffic measurement studies. P2P traffic identification methods and the recent P2P traffic optimization schemes constitute the core of this report, in which we examine the state-of-the-art in this field.

In this Tech Report, we start by introducing the principles of congestion control and its importance in the stability of the Internet. We then move on to provide some background information on TCP's congestion control algorithms as well as on Explicit Congestion Notication (ECN). Afterwards, we explain the concepts behind the major Active Queue Management (AQM) mechanisms and explore their designs. We conclude the report by stating our opinion regarding "fairness" and will reinforce our position by introducing the "re-ECN" initiative.

Due to known difficulties of researchers in the networking domain regarding experimentation of their ideas in actual networks, network simulators have become indispensable tools for investigating and validating various ideas in all layers of the network. In this survey, we inspect the implementations of IEEE 802.11 PHY-MAC and propagation models of some of the well-known, open-source network simulators.