It is important to know that your network is able to operate at its peak potential. However, it can be difficult to artificially simulate a large amount of traffic to validate the throughput ceiling. Enter iPerf and its updated version with a Java GUI, JPerf. That latest version of JPerf 2.0.2 allows you to easily adjust the buffer/MSS/TCP window size, and navigate all the lesser known IPerf CLI options. As a bonus this tool will also work with an IPv6-capable client and server.