Networking with a TL-ER5120

Hello,

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I have bought a TL-ER5120v6 for an office network. We currently have a dual WAN incoming connection. One with 350Mbps and one with 400Mbps.

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My question is: I have not been able to get the speed 750Mbps with two devices. I mean:

1. I run a simultaneous speedtest on two devices, but the sum does not add to 750Mbps. It seems one connection get's used at all times... Not two. Is this because the network is connected to a single access point? So this access point is routed to only one of the networks? Do I need to test connecting two cable connections directly into the router?

Does this means the load balancing is not properly configured? I am getting around 200Mbps on each device at top.

I have also noticed the upload speeds are 50Mbps for one provider and 100Mbps for another. I get a 100Mbps speed with an IP from the 50Mbps speed provider... This is totally weird, seems the system uses the highest upload speed connection ....

I am considering changing it to an ubiquity router if you think this solves the issue. I hope you can help me out on this!