From UntangleWiki

Do I have to pay for this?

Yes, it is a premium subscription. It is NOT included in Professional Package, so you would need to purchase it separately.

I installed and configured WAN Balancer, but nothing is happening. What should I do?

Check your Multi-WAN setup to make sure that you've set this part up properly.

Are the bandwidth settings percentages?

No. You enter bandwidth numbers for each connection that are relative to each other, and Untangle will determine the proper percentages. If you have a 3 Mb/s connection, and a 10 Mb/s connection, you could simply enter 3 for the first and 10 for the second.

Why can't I accurately enter the speed of my 1.5 Mb/s connection?

The bandwidth settings accept integers (whole numbers) only. To accurately represent the speed difference, either enter double the speed of each connection or multiply by ten.

Why is some of my internet traffic being stopped?

Check the status of your WAN Failover service. If it has been uninstalled, is turned off or is not functioning normally and you have lost one of your internet connections, traffic allocation defined by WAN Balancer is still being performed even though one of your connections is down.

If a source route specifics that certain traffic should always use one WAN - what happens when that WAN interface is down?

If a source route specifics a certain subnet should always use a given WAN that traffic is forced out that WAN. For example, A source route rule can always route 192.168.10.0/24 traffic out the DMZ WAN interface. However if the DMZ WAN interface is determined to be down according to the WAN Failover app, then the source route rule is ignored and that traffic will go out the other WAN(s).