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ISP :

I had TL-R480T+ which was doing its job of Load Balancing perfectly. Unfortunately its 100mb ports were a bondage for me. So I got TL-ER5120 today for it's gigabit ports. But TL-ER5120 is not doing the load balancing.
It is not adding the speeds which I am getting with R480T+. At any point of time I am getting speed of only one WAN port and not all three together.
It is configured for 3-WAN and two LANs.Though I am using only dedicated LAN port to connect to my gigabit switch and then the clients.
All WANs are static IP.
When connecting one WAN - the speed is the same, when two/three - speed of any one.


WAN1 - UP 50MB DOWN 1000MB
WAN2 - UP 50MB DOWN 1000MB
WAN3 - UP 5MB DOWN 10MB

PLEASE HELP URGENTLY