D-Link DLM-3500 Quick Installation Manual page 13

7. Press [Apply] to update all the parameters you have just entered.
2.4.6 WAN Out Load Balancing Configuration
The following configuration is about load balancing with two wan links. In this example, algorithm "Run
Robin" is employed to do load balancing with WAN 1 and WAN 2. Click on the [Service] -> [Auto Routing]
in menu, you could see the [Auto Routing] page and the procedure for configuration is listed below:
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DLM-3500 Quick Installation Guide