This is certainly an interesting design! I don't see two physical interfaces with IPs in the same subnet very often. If the ISP cannot change your external addressing or you cannot use just a single outside interface, then you might try the following: Create two Virtual Routers (You can have overlapping subnets using multiple Virtual Routers) and put each external interface into its own. Call them Default and Server. Both have a 0.0.0.0/0 route next hop of 100.100.100.100. Create three L3 interfaces: Inside interface goes into Default Virtual Router, Inside zone .198 goes into Default Virtual Router, Public zone .197 goes into Server Virtual Router, Public zone Create your NAT rules as you have defined in the diagram Make the Server rule static, Bidirectional Make the Client PC rule dynamic-ip-and-port Create two PBF rules: Inbound PBF rule for the Server: from .197 interface, then send to Internal interface Outbound PBF rule for the Server: from 10.1.1.2/32 address, then send to .197 interface Create an any any allow Security rule to test Seems like this should work in theory. You are basically using normal routing for the bulk of the traffic and PBF to force the Server traffic over the other link. Cheers, Kelly
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