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You will get a better response if you don't have a wall of text. I'm probably qualified to answer your question, but could not be bothered to go wade through it. (I'm not the downvoter though)– davidgoCommented Jul 11, 2018 at 4:43
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Are you sure the external PC is pinging your server, and not just your ISPs server(s)? Can you run e.g. Wireshark on your server and verify the ping packets arrive? Because most ISPs today use carrier grade NAT, which means you won't get port forwarding to work, not matter what you try. Another way to test is to temporarily remove the second router, and see if port forwarding works without the second router. If it doesn't, the second router and the two subnets are not the problem...– dirktCommented Jul 11, 2018 at 6:19
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