itmBench: generalized API for Internet traffic managers

Internet traffic managers (ITMs) are special machines placed at strategic places in the Internet. itmBench is an interface that allows users (e.g. network managers, service providers, or experimental researchers) to register different traffic control functionalities to run on one ITM or an overlay of ITMs. Thus itmBench offers a tool that is extensible and powerful yet easy to maintain. ITM traffic control applications could be developed either using a kernel API so they run in kernel space, or using a user-space API so they run in user space. We demonstrate the flexibility of itmBench by showing the implementation of a kernel module that provides a differentiated network service. Due to space limitations, we refer the reader to Gali Diamant et al. (December 16, 2003) for a user-space module that provides an overlay routing service. Our itmBench Linux-based prototype is free software and can be obtained from http: //www.cs.bu.edu/groups/itm/.