https://tsvinc.dev/tags/nat/ Recent content in Nat on tsvinc Hugo en-us Tue, 07 Jul 2026 00:00:00 +0000 https://tsvinc.dev/posts/it-wasnt-cgnat-it-was-a-typo/ Tue, 07 Jul 2026 00:00:00 +0000 https://tsvinc.dev/posts/it-wasnt-cgnat-it-was-a-typo/ <p>I found the actual bug, fixed it, declared it beside the point, and then switched off the instrument that would have proved me wrong. That order is the whole story — not the tidier version, where I inferred instead of testing and then finally tested.</p> <h2 id="the-correct-answer-came-first-then-got-discarded">The correct answer came first, then got discarded<a class="heading-anchor" href="#the-correct-answer-came-first-then-got-discarded" aria-label="Link to section: The correct answer came first, then got discarded">#</a></h2><p>The symptom was clean. Inbound peer port on the media box was closed. <a href="https://tsvinc.dev/posts/transmission-rce-by-default/">Transmission's</a> <code>port-test</code> — an external service that connects <em>back</em> to your public IP and port — returned <code>false</code>. Nothing was reaching the daemon from outside. At that moment no router forward existed yet, so <code>false</code> was the right answer to the right question.</p>