Create outbound load-balancing NAT rules
To balance outbound connections between the NetLinks, define NAT rules using the source NAT addressing defined in the Outbound Multi-Link element.
You can create several Outbound Multi-Link elements to balance different types of traffic differently. If you do not want to balance some traffic, direct the traffic through a specific NetLink with a normal NAT rule before the balancing rule.
You activate Multi-Link for outbound connections in the Firewall Policy with NAT rules that match certain traffic for Outbound Multi-Link address translation. Other NAT rules can translate the source addresses in outbound connections to the IP address space of a particular ISP. The traffic is automatically routed through a particular link, even if the link fails. Only the part of traffic that matches a NAT rule with the Outbound Multi-Link element is balanced between different links.
Some protocols cannot use dynamic NAT based on IP/port translation. To provide high availability and load balancing for these protocols, you can use static NAT with an Outbound Multi-Link element in an outbound load-balancing NAT rule. When static NAT is used, the size of the source network must be the same as the size of the Multi-Link network.
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