To sum it up: External: 63.x.x.x/24 DMZ1: 10.11.107.1/24 DMZ2: 10.11.113.1/24 I assume the range at External is a public range handed over to you by your ISP? This is what I would do: 1) Setup a linknet between your PA and your ISP, for example: PA: 10.0.0.1/30 ISP: 10.0.0.2/30 2) Instruct your ISP to route that 63.x.x.x/24 with nexthop 10.0.0.1 (or whatever IP your PA end up with). 3) Set your PA to use 10.0.0.2 (or whatever IP your ISP will use) as default gateway. Now you can setup parts of 63.x.x.x/24 directly on interfaces on your PA aswell as NAT the other IP's to the DMZ's using private IP's (DMZ1 and DMZ2). So you would end up with (just an example): External: 10.0.0.1/30 (10.0.0.1 is IP at PA, routed 63.x.x.x/24) DMZ1: 10.11.107.1/24 (10.11.107.1 is IP at PA, 10.11.107.0-255) DMZ2: 10.11.113.1/24 (10.11.113.1 is IP at PA, 10.11.113.0-255) DMZ3: 63.0.0.113/28 (63.0.0.113 is IP at PA, 63.0.0.112-127) NAT1: 63.0.0.1 -> 10.11.107.2 (or whatever) NAT2: 63.0.0.44 -> 10.11.113.5 (or whatever) But if possible I would start to use this range from two sides. Like NATed IPs from the lower part and routed IPs from the higher part (or the other way around 😃 Like so: External: 10.0.0.1/30 (10.0.0.1 is IP at PA, routed 63.x.x.x/24 from ISP) DMZ1: 10.11.107.1/24 (10.11.107.1 is IP at PA, 10.11.107.0-255) DMZ2: 10.11.113.1/24 (10.11.113.1 is IP at PA, 10.11.113.0-255) DMZ3: 63.0.0.241/28 (63.0.0.241 is IP at PA, 63.0.0.240-255) NAT1: 63.0.0.1 -> 10.11.107.2 (or whatever) NAT2: 63.0.0.2 -> 10.11.113.5 (or whatever)
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