While the UDP traffic generator uses UDP datagrams with controlled load to stress the network. The throughput generator is focussed on overloading the network with packets. Despite it's capability of generating UDP traffic, this NetPerf frontend is mostly used for TCP traffic generation. NetPerf can be freely downloaded from: http://www.netperf.org.
The interface is straight forward and permits to specify duration, type of traffic and the end-points of the communication.