Authors: Philipp Berndt, Martin Raack, and Odej Kao
Efficient realistic network models are fundament alto simulating distributed systems and protocols. The Delfoinetwork model divides the network into a location- and distance dependent but (from the user’s perspective) stateless backbone part and a stateful local Internet access part. Its backbone characteristics are modeled by arranging all hosts into an dimensional delay space and interpolating delays from their distance, before adding regional jitter. The local characteristics are obtained from two queues modeling the send buffers within the local up- and down-link, i.e. DSL or cable modem and broadband remote access server, respectively. These models were parametrized from Internet speed data based on HTTP-probes, measured by millions of users and provided by speedtest.net. While proving the model’s concept, the results show how the observed heterogeneity of consumer Internet stretches basic GNP models to their limits.