Configure The Wan Trunk - ZyXEL Communications ZyWALL USG Series Application Notes

Repeat the process to set the egress bandwidth for wan2 to 512 Kbps.
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For 3G interface settings, go to Configuration > Network > Interface > Cellular. Double-click
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the cellular1 entry and set the egress bandwidth for cellular1 to 512 Kbps.

4.2.2 Configure the WAN Trunk

Click Configuration > Network > Interface > Trunk. Click the Add icon.
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Name the trunk and set the Load Balancing Algorithm field to Weighted Round Robin.
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Add wan1 and enter 2 in the Weight column.
Add wan2 (or cellular1) and enter 1 in the Weight column.
Click OK.
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