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Internet tomography and topology modelling (BGP, IXPs, AS-level). We design routing protocols whose tables grow sub-linearly with network size.

Lines of work

Tomography

traceroute-like probes, analysis of measurement bias, and discovery of hidden MPLS tunnels.

AS-level topology and BGP

Modelling the autonomous-system graph, k-core decomposition of the Internet, and tracking CDNs in the network core.

Latin American IXPs

IXP deployment in developing countries and its impact on Quality of Service and traffic economics.

Standards (IETF)

IETF contributions — RFC 9198 (AURA) on standardising unidirectional measurements — and proposals for sub-linear EGP routing.

Flagship initiative

First IXPs of Bolivia and Paraguay — Internet Society

We contributed to the design, deployment, and measurement of the first national Internet Exchange Points (IXPs) of Bolivia and Paraguay, under the Internet Society program. The work combines active network measurement with an economic and regulatory analysis of how IXPs change Internet access in developing countries. In collaboration with Dr. Hernán Galperin (USC Annenberg, formerly Universidad de San Andrés).

Related projects

CDNs en el núcleo de Internet (TMA 2018)

How content providers became central to the AS ecosystem after the rise of private CDNs.

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I'm Here!

Visualise a map of the Internet topology, showing where you are.

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RFC 9198 — AURA

Advanced Unidirectional Route Assessment — informational IETF RFC.

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Selected publications

  1. A First Look at the Latin American IXPs
    Esteban Carisimo, Julián M. Del Fiore, Diego Dujovne, Cristel Pelsser, and J. Ignacio Alvarez-Hamelin
    ACM SIGCOMM Computer Communication Review, Mar 2020
    Details
  2. Studying the evolution of content providers in IPv4 and IPv6 internet cores
    Esteban Carisimo, Carlos Selmo, J. Ignacio Alvarez-Hamelin, and Amogh Dhamdhere
    Computer Communications, 2019
    Details
  3. The Atlas Vision of IPv6 in Latin America: Topology and Latency
    Diego Kiedanski, Eduardo Grampı́n, and J. Ignacio Alvarez-Hamelin
    In Proceedings of the 10th Latin America Networking Conference, 2018
    Details
  4. A new intrinsic way to measure IXP performance: an experience in Bolivia
    Esteban Carisimo, Hernan Galperin, and J. Ignacio Alvarez-Hamelin
    arXiv, May 2015
    Details
  5. K-core decomposition of Internet graphs: hierarchies, self-similarity and measurement biases
    J. Ignacio Alvarez-Hamelin, Luca Dall’Asta, Alain Barrat, and Alessandro Vespignani
    Networks and Heterogeneous Media, 2008
    Details