https://nalar.dev/tags/networking/ Recent content in Networking on Nalar Hugo en-us Tue, 01 Sep 2026 00:00:00 +0700 https://nalar.dev/linux-network-troubleshooting-ip-ss-dig-curl/ Tue, 01 Sep 2026 00:00:00 +0700 https://nalar.dev/linux-network-troubleshooting-ip-ss-dig-curl/ <p>When a Linux service is &ldquo;unreachable,&rdquo; the failure can be in several different layers: the local interface, routing, a listening socket, DNS, a firewall, TLS, or the application itself.</p> <p>Randomly restarting services makes diagnosis harder. A better approach is to move from local state outward and identify the first layer that does not behave as expected.</p> <h2 id="1-confirm-the-interface-and-address">1. Confirm the interface and address</h2> <p>Start with the addresses configured on the host:</p>