All Barracuda Link Balancer models, firmware version 1.2 and above
On an ongoing and frequent basis, the Barracuda Link Balancer calculates a weight for each primary and backup WAN link. The weight is the available capacity for each link based on uplink speed and current usage. When traffic from a client IP address going to a new destination IP address is detected, the weights of the links are compared and the link with the highest weight is used.
If you do not want all WAN interfaces to always be used in this way, you can change this behavior using the Link Preferences table on the Services > Bandwidth Mgmt page.
The supported link types are: