IGen is a network topology generator. Unlike GT-ITM and BRITE, IGen does not rely on probabilistic methods to generate network topologies. Since real networks are the outcome of a careful network design, IGen implements various network design heuristics such as MENTOR, MENTour, Delaunay triangulation and Two Trees for the purpose of building network topologies.

A recent fork of this code is available at http://genc.tato.al/2017/10/17/igen-topology-generator-revived/

Building increasingly precise and realistic network topologies is an important issue for the purpose of evaluating networking applications. Still, the generation of router-level topologies has not been widely covered. Though, the properties of the router-level topologies have a significant impact on simulation results. For instance, the evaluation of applications such as Voice/Video over IP, P2P, routing protocols and traffic engineering methods critically depends on the properties captured by the topology model.

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The Internet is a very large scale complex system whose properties are not entirely completely known. However, a detailed knowledge of the Internet is key to understand the mechanisms and protocols that work well and those that could be improved.

This two days course, organised in the framework of the E-Next Network of Excellence was composed of the following presentations

• Gianluca Iannacone (intel) : Passive measurements of IP networks
• Augustin Soule (LIP6) : Traffic Matrices (measurement and characterization)
• Steve Uhlig (UCL) : Macroscopic characterization of Internet traffic
• Patrice Abry (ENS) : Multi-scale traffic modeling
• Chadi Barakat : Issues related to TCP modeling
• Benoît Claise (Cisco systems) : Using NetFlow to Measure the Internet.
  

Shim6 is a mechanism that allows multihomed hosts to take profit from the multiple paths available across the Internet. It is designed as a new intermediate sublayer inside the IPv6 network layer. Shim6 is still a work in progress. The set of drafts produced by the IETF Shim6 working group is available here.