I have multiple static WAN IPs assigned by my ISP (e.g., x.x.x.1 thru x.x.x.50). I have 2 mail servers (each housing a different domain's MX) on the internal LAN. The public DNS addresses of each mail server are x.x.x.20 and x.x.x.21.
Using the Firewalla Gold in router mode, how do I create port-forwarding rule on the WAN interface where x.x.x.20:25 goes to one server (e.g., MX for domain_a.com on LAN IP y.y.y.100:25) and x.x.x.21:25 goes to another (e.g., MX for domain_b.com on LAN IP y.y.y.101:25)?
It seems that port-forwarding is limited to the primary interface -- or at least a single interface -- on the WAN (in this case call it x.x.x.1) and there's no ability to specify the WAN source IP for the forwarding rule.
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