Example: Using Multi-Link to prepare for ISP downtime

This scenario shows an example of using Multi-Link to configure connections to two ISPs. This configuration guarantees connectivity if one ISP fails.

Company A wants to make sure that their Internet connection remains available even when one ISP connection fails. The company has subscribed to one Internet connection each from ISP A and ISP B. The administrators decide to use Multi-Link to guarantee high availability of Internet connectivity.

The administrators do the following:

  1. Create NetLink elements to represent connections to ISP A and ISP B.
  2. Place the ISP A and ISP B NetLinks under the correct interfaces in the Routing tree.
  3. Create an Outbound Multi-Link element and add the ISP A and ISP B NetLinks to it.

  4. Define the following NAT rule in the Engine Policy so that traffic from the internal network to destinations that are not internal is handled by the Outbound Multi-Link element:

    Source Destination Service NAT
    Internal Network element Not Internal expression ANY Dynamic load balancing: My Multi-Link