This tutorial provides an in-depth description and analysis of the Internet architecture and design principles. It is based on the experiences gained by the speakers from Sprint and AT&T's Tier-1 IP backbone. The tutorial will give a comprehensive understanding of what the Internet is today; it will help understand the design choices, and explain the limits and the strengths of the Internet model. Quality of service will also be discussed extensively, from new services to the different approaches towards providing these services. The tutorial will start with a brief discussion of the Internet design philosophy and the current hierarchical organization of the Internet into autonomous systems. We will describe the current architecture of an IP backbone, providing a historical perspective on various aspects such as link upgrades, evolution of Points of Presence (POP), etc. This description will be illustrated with examples from Sprint's IP backbone networks; elements of generalization to other backbones will also be discussed. Next, we will explain the backbone design philosophy encompassing issues such as over-provisioning, QOS, fault tolerance and manageability. Then, we will discuss routing policies and practices. We’ll present the Internet routing architecture, give a brief introduction to intra-domain routing (such as OSPF and IS- IS), and give an operational view of the Border Gateway Protocol (BGP), which is the inter-domain routing protocol used in the Internet today. This part will also discuss typical relationships between networks and traffic engineering practices.

The second day of this tutorial takes a more research perspective on measuring the Internet. First, we will present techniques for measuring Internet routing and traffic. This will include discussions on the types of data that can be captured (packet- level, flow-level, BGP update messages, etc.), possible points of observation (end-hosts, routers, backbone links, etc.), common metrics (loss, delay, jitter, etc.) and the notions of active and passive monitoring. We will describe standard tools and information sources. We will conclude this section with some examples of how measurement can help in the design and engineering of IP backbones by providing valuable input for resource provisioning, traffic engineering, DoS attack detection and improving network routing protocol operations.

Renata Teixeira (http://rp.lip6.fr/~teixeira/) received the B.Sc. degree in computer science and the M.Sc. degree in electrical engineering from Universidade Federal do Rio de Janeiro, Brazil, in 1997 and 1999, respectively, and the Ph.D. degree in computer science from the University of California, San Diego, in 2005, for which she was awarded the Department of Computer Science and Engineering Ph.D. Dissertation Award 2005. During her Ph.D., Teixeira worked at the AT&T Labs in Florham Park. At AT&T, she acquired a deep understanding of operation and engineering practices in large ISP backbones. She is currently a Researcher with the Centre National de la Recherche Scientifique (CNRS) at LIP6, Universit? Pierre et Marie Curie-Paris 6, Paris, France. Teixeira has served as a program committee member of the most selective conferences in the networking community (such as ACM SIGCOMM, IEEE INFOCOM, and ACM IMC). Her research interests are in measurement and analysis of routing protocols, and in management of large IP networks.

Christophe Diot received a Ph.D. degree in Computer Science from INP Grenoble in 1991, and HDR in 1996. He was with INRIA Sophia-Antipolis from October 1993 to September 1998, where he pioneered work on diffserv, multicast, and peer-to-peer multi-player games on the internet. Diot started and led the IP research group at Sprint (Burlingame, CA) from October 1998 to April 2003. At Sprint, he acquired a deep knowledge of large Internet backbone design and engineering, and pioneered measurement based research. The IPMON system was the first large scale passive monitoring infrastructure deployed in an operational backbone. At Intel Research (Cambridge, UK) from May 2003 to September 2005, Diot started work on network wide anomalu detection. He is again a pioneer in this area where he co-authored most of the initial papers in this area. He joined Thomson in October 2005 to start and manage the Paris Research Lab (http://thlab.net). At Thomson, Diot's research activities focus on advanced peer-to-peer communication services and platforms for the future Internet. Diot has around 20 patents and more than 200 international publications in top conferences and journals. Diot is an ACM fellow.