Firewall Builder supports ECMP routes in Linux-based firewalls using iptables. To create an ECMP rule simply specify several rules with different paths (i.e., different combinations of Gateway and Interface, for the same Destination and with the same metric).
In this example, there are three different paths to HostA.
Rules are automatically classified in ECMP rules and non-ECMP. The ECMP rules are written out in a separated section of the firewall script after the "normal" routing rules.
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