DBS controller is a program controlling the experiment of TCP/UDP data transfer. Functions of DBS controller are as follows: First, DBS controller reads command from a command file. Then it will direct DBS daemons to do data transfer experiment. After receiving results from the daemons, DBS controller will save it in files.

DBS daemon is a daemon program that is executed on the experimental hosts. It sends and receives traffic according to the commands instructed by DBS controller.