This work was supported by the European Commission within the IST ATRIUM project. Technical Report Infonet-TR-2001-11 Report Date: July 2001 Report Status: Public University of Namur FUNDP I NFONET G ROUP http://www.infonet.fundp.ac.be I NSTITUT D’I NFORMATIQUE Simulating Interdomain Traffic at the Flow-Level Steve Uhlig