# Example: Balancing traffic according to link capacity

To manage ISP connections having very different bandwidths, you configure an Outbound Multi-Link element and select ratio load balancing.

Company B has three ISP connections that have different bandwidths:

- ISP A 20 Mbit/s
- ISP B 10 Mbit/s
- ISP C 4 Mbit/s

The administrators want the traffic to be divided between the NetLinks according to the ratio of their relative bandwidths. This means that ISP A handles twice as much traffic as ISP B and five times as much traffic as ISP C. The administrators have already created and configured NetLink elements to represent each ISP connection, so now they:

1. Combine the NetLinks for each ISP connection into an Outbound Multi-Link element and select the Ratio load-balancing method.
2. Define the following NAT rule for outbound load balancing in the Firewall Policy:

   Source | Destination | Service | NAT
   --- | --- | --- | ---
   ANY | ANY | ANY | Dynamic load balancing: Multi-Link Element