https://nosubject.io/en/tags/nat/Recent content in NAT on No Subject - nosubject.io -Hugoen-USWed, 02 Sep 2026 00:00:00 +0900https://nosubject.io/en/deco-x20-openvpn-port-forwarding-troubleshooting/Wed, 02 Sep 2026 00:00:00 +0900https://nosubject.io/en/deco-x20-openvpn-port-forwarding-troubleshooting/<p>When setting up port forwarding on Deco X20 (TP-Link), we summarize a case where the destination IP changed unexpectedly after saving, causing traffic to miss the target.<br> This is handled as an environment-dependent incident and not claimed as a confirmed general defect of all X20 units.</p> <h2 id="reference-case">Reference Case</h2> <p>In the TP-Link community, a closely related known case was reported for Deco X20 + Firmware 1.6.1.<br> In that case (<code>Deco X20 V1 / Firmware 1.6.1</code>), a port forwarding destination such as <code>192.168.1.x</code> was rewritten to <code>192.168.0.x</code>, and changing the subnet mask to <code>255.255.255.0 (/24)</code> was reported to keep the expected subnet handling.</p>