Dear @Shukz,

i having problem with my TL-ER6120 v1,  I don't seem to get max speed when I do speedtest. I have a modem at our local ISP and it is in bridge mode. If I direct connect the laptop via wired it gets 300mbps which is right on the plan we took. But if I connect the TL-ER6120 to the modem  my laptop my speedtest is 150-160mbps only. Do you have any idea what the cause of the problem? is havent the upgrade the firmware yet. i connect it fresh from the box and every setting is still default.

 

The result of Speedtest^® may be affected by the ISP and network delay, we recommend you use the Iperf tool to test the speed, which can measure the most accurate speed, reducing the network influence to the lowest.

How to use Iperf to test the speed on TP-Link routers
 

Note that the NAT throughput of TL-ER6120 V1 is around 350Mbps.