@Jackson552 Firstly your network must have a gateway. If the dlink router hasn't fiber port it's your only gateway, then you may need to use the following topology. ISP----(VLAN1300)----(port 28)...

@networkboss4u You need to reset the switch and access through default username and password (admin/admin) https://www.tp-link.com/en/support/faq/2124/

@3wer66 You can access the management web of R600VPN to check the port speed. The default IP address of R600VPN is 192.168.0.1. If your PC uses dynamic IP, just acccess 192.168.0.1 in browser. Then...

@DarylVelez ER6120 has english firmware. But cannot make sure whether it can be used on the deivces that sold in China. Because the hardware may be different. English Fimrware....

@networkboss4u You can try to follow the FAQ to reset your switch. https://www.tp-link.com/en/support/faq/2124/ Then remove all devices from the switch, only connect a PC to switch. Confirm whether...

@phil_rv Loop protection will block the port when it detects a loop. If the port is blocked, the LED of the port will shows green and orange at the same time. Normally green means 1000M speed and...