Outbound load-balancing NAT
You can use NAT for outbound load-balancing.
In addition to source and destination translation, another main use for NAT is outbound load balancing. It is used in a Multi-Link configuration where the Firewall balances outbound traffic between two or more network connections. To be able to direct traffic to the faster connection, the firewall translates outgoing connections to an address from a pool assigned to each available NetLink. In this case, the IP addresses used for the NAT are defined in the properties of the Outbound Multi-Link element.