  The Internet topology is of high importance in designing networks and
architectures, evaluating performance, and economics. Interconnections between
domains (ASes), routers, and points of presence (PoPs), have been measured,
analyzed, and modeled. However, existing models have some serious shortcomings,
related to ease, accuracy and completeness of measurements, and limited
applicability to emerging research areas. To this end, in this paper, we
propose a novel approach towards capturing the inter-domain Internet topology.
Motivated by the recent interest in the Internet eXchange Points (IXPs), we
introduce a network graph model based on IXPs and their AS memberships. The
proposed model aims to complement previous modeling efforts, shed light on
unexplored characteristics of the Internet topology, and support new research
directions. We also collect and make available Internet connectivity data,
analyze main topological properties, and discuss application-related issues.
