Hi @Bill-Jerome ,
Great question. I don't think it can be done with 1 NGFW because both static route path monitoring and PBF require a next hop to be configured. As I understand your scenario, your default routes are learned dynamically. However, with 2 NGFWs, you could enable Path Monitoring with 1 ISP on each NGFW. If you wanted to load balance between the two, it can be done but would be complicated. Primary/Standby would be the easiest scenario.
It is very important that you use multiple Internet IP addresses and set your Failure Condition to all so that if one Internet server goes down you do not fail over.
Edit: How often do your IP addresses change? You could do it with 1 NGFW and update your next hops whenever the IP address changes.
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