Das ganze auf Englisch

To test our bandwidth / latency, you may use the following server: 

speedtest.dcsix.net
The server has IPv4 and IPv6 connectivity with 10 Gbps bandwidth. It is ideal for testing our bandwidth, e.g. to/from our VMware infrastructure.

The following files are available for download via HTTP:  Additionally, you may use iperf2 and iperf3 as follows:  Download of iperf2 or iperf3, e.g. for Windows or MacOS.
For most linux distributions, iperf is available in both versions directly in the repositories. 

The examples are calls with a Linux CLI (bash). The parameters are equal for Windows, Linux, and MacOS.

Please note: The use of iperf2/3 with UDP may trigger DDoS protection mechanisms. If you use a server from a different provider to test for example, it may potentially cause your other provider to block the server.