Iperf

is a network testing utility helpful for determining network throughput. On Gentoo, and  are slotted, therefore both version 2 and version 3 of the utility can be installed concurrently.

Files

 * - Global (system wide) configuration file.
 * - Local (per user) configuration file.

External resources

 * http://arstechnica.com/gadgets/2016/01/numbers-dont-lie-its-time-to-build-your-own-router/ - An article where was used to determine side-by-side comparison of router throughput, which is a perfect, real life example.