ISP Load Balancing technology elimates the risk of mantaining only a single link to the Internet. Using 2 or more links brings the instant benefit of increased bandwidth and reduncancy. As more bandwidth is required, just add more links. Companies with Leased Lines who are possibly locked into long-term contracts, this is a cost-effective way to maintain existing infrastructure whilst investing in more bandwidth by the way of low-cost DSL circuits.

Traffic distribution and failover

Internet traffic is distributed across each available WAN link. Of course, this can be based on policy, such as current loading, state and amount of available bandwidth. Nearly all protocols work well with this technique, including HTTP, FTP and SMTP.

Traffic distribution is done "by connection", so protocol’s that use multiple connections (such as HTTP) have greater benefit with this method.

On link failure connections related to the failed link will be lost, however most applications will retry the connection, in which case the Load Balancer will route the new connection down an available link.