Go to the "Symmetric NAT Test" page (https://tomchen.github.io/symmetric-nat-test/) and see if you are behind a Symmetric NAT or Normal NAT (Full-cone NAT or other non-symmetric)
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NAT Test: Am I behind a Symmetric NAT or Normal NAT (Full-cone NAT or other non-symmetric)
Home Page: https://tomchen.github.io/symmetric-nat-test/