How about Port Triggering? It might be a possible workaround but it will not achieve the other thing you want which is non-plex clients on the second WAN.
I tried port triggering, this did not work. But thanks for the suggestion.
But also the rule function does not work in general for me. If I select a rule for a an ip/pc then still that pc gets different primary/secondary wan ip's on refresh or checking with different whats my ip sites for example.
I select source ip = all ips (leave blank) destination is my wired pc ip. also tested with other laptop etc.
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