@crrodriguez , thank you for your advice in any way. Unfortunately we don't have free choice of modem here in Belgium (yet) so the provider won't let people interfere with modemfirmware whatsoever....

@crrodriguez , wel I did change the IP-address of the WAN-port to 192.168.2.3 and put a PC on that port to make the iperf-test, as it is described here: iperf So I didn't just test the switch but...

ok, finaly found the time to do some more tests. These are the results with iPerf: Connecting to host 192.168.2.30, port 5201 [ 4] local 192.168.100.15 port 61935 connected to 192.168.2.30 port 5201...

@Virgo I get the point to test independent from the ISP. Nevertheless the speedtest gives me the expected speed if I don't pass via the ER7212-router. Will test using the iperf program when I get the...

@crrodriguez I'll keep your advise in mind for the 172.16.x.x range. But as I am far from a real network engineer I didn't do any configuration that limits any bandwidth so far. Just created some...

@crrodriguez I am using a USB-C ethernet adapter but when I do the test directly after the ISP's modem I'm getting my 300Mbps. Also tested on a different PC with built-in ethernet adapter or testing...