Hello, We are working on a research project on interdomain traffic engineering and would like to quantitatively evaluate interdomain traffic engineering solutions in a realistic way. We have a BGP simulator that allows us to simulate networks with a few hundreds of AS and are adding several mechanisms to this simulator. To complement the simulator, we are looking for realistic cost models of transit services. Since we do not buy transit services, we have some difficulties finding this information. For the moment, our cost models are the following : - flat fee for a L Mbps link - volume based, y $ per Mbps (95% quantile) for a L Mbps link - burstable, flat fee for x Mbps on a L Mbps and z $ per Mbps above x We would like to know whether these three cost models accurately reflect the current pricing schemes of transit services and what are the most popular ones ? If you know other pricing schemes that should be taken into account, we would appreciate to have additional information. I heard of destination-based pricing schemes, but do not have enough details on them and don't know whether they are frequently used. You can either answer directly to us (Olivier.Bonaventure@info.fundp.ac.be and suh@info.ucl.ac.be) and we will summarize or directly to the list. Thanks a lot for your help, Olivier Bonaventure --- http://www.infonet.fundp.ac.be