On the Propagation of Congestion Waves in the Internet
  Traffic modeling of communication networks such as Internet has become a very important field of research. A number of interesting phenomena are found in measurements and traffic simulations. One of them is the propagation of congestion waves opposite to the main packet flow direction. The purpose of this paper is to model and analyze packet congestion on a given route and to give a possible explanation to this phenomenon. 
Jozsef Steger, Peter Vaderna and Gabor Vattay