Example: Balancing traffic between Internet connections

This scenario shows an example of using Multi-Link to balance the load of traffic between two smaller Internet connections instead of one larger connection.

The administrator at Company B determines that a 4 megabyte Internet connection is required to handle the volume of traffic their network receives. However, Company B is a small company on a tight budget, and the cost of a single 4 megabyte connection is too high. The administrator decides to subscribe to one 2 megabyte connection each from ISP A and ISP B, and use Multi-Link to balance the load of traffic between the two connections to reduce costs.

The administrator:

  1. Creates NetLink elements to represent connections to ISP A and ISP B.
  2. Places the ISP A and ISP B NetLinks under the correct interfaces in the Routing tree.
  3. Creates an Outbound Multi-Link element and adds the ISP A and ISP B NetLinks to it.
  4. Defines the following NAT rule in the Firewall Policy so that traffic from the internal network to destinations that are not internal is balanced by the Outbound Multi-Link element (My Multi-Link):
    Source Destination Service NAT
    Internal Network element Not Internal expression ANY Dynamic load balancing: My Multi-Link