You will be able to achieve the same through PBF ( Policy based forwarding), but keep in mind as PBF decision has been taken by PBF "RULE" configured on the PA firewall, not by routing. So PBF rule can replace the routing as it is not session based. Please make sure incoming/outgoing traffic passing through the same ISP link. It will help you to avoid asymmetric-routing.
I have PBF working on host B with a single service, but here's another question. How can I force all services on host B to use PBF. I tested PBF using only the http-service. If I set the policy rule to any, any for application and services, it seems to break the rule. The http request hangs. Also, if I only have the http-service enabled via PBF, and I perform execute the traceroute command on hostB, it uses ISP Gateway A and not ISP Gateway B to perfrom the traceroute.
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