A Survey on Research on the Application-Layer Traffic Optimization (ALTO) Problem

Document Type Replaced Internet-Draft (individual)
Last updated 2009-08-20 (latest revision 2009-07-06)
Replaced by draft-irtf-p2prg-alto-survey
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


A significant part of the Internet traffic today is generated by peer-to-peer (P2P) applications used traditionally for file-sharing, and more recently for real-time communications and live media streaming. Such applications discover a route to each other through an overlay network with little knowledge of the underlying network topology. As a result, they may choose peers based on information deduced from empirical measurements, which can lead to suboptimal choices. We refer to this as the Application Layer Traffic Optimization (ALTO) problem. In this draft we present a survey of existing literature on discovering topology characteristics.


Ivica Rimac (rimac@bell-labs.com)
Volker Hilt (volkerh@bell-labs.com)
Marco Tomsu (marco.tomsu@alcatel-lucent.com)
Vijay Gurbani (vkg@bell-labs.com)
Enrico Marocco (enrico.marocco@telecomitalia.it)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)