https://my-it-blog.netlify.app/tags/routing/ Recent content in Routing on My IT Journal Hugo en-us Wed, 17 Jun 2026 00:00:00 +0000 https://my-it-blog.netlify.app/posts/dmz-networking/ Wed, 17 Jun 2026 00:00:00 +0000 https://my-it-blog.netlify.app/posts/dmz-networking/ <h2 id="objective">Objective</h2> <p>The lab focuses on troubleshooting real-world network failures by systematically isolating issues at each layer of the network stack.</p> <hr> <h2 id="network-topology">Network Topology</h2> <pre tabindex="0"><code>LAN (User Network) DMZ (Service Network) 192.168.10.0/24 192.168.20.0/24 __________________ _____________________ Client VM Server VM 192.168.10.101 192.168.20.10 | | | | ________ Firewall VM ___________ (Router + Firewall) </code></pre><hr> <h2 id="issue-1-no-connectivity-between-networks">Issue 1: No connectivity between networks</h2> <p>Failure to connect to the webserver</p> <p><img alt="issue" loading="lazy" src="https://my-it-blog.netlify.app/posts/dmz-networking/issue.png"></p> <hr> <h2 id="troubleshooting-workflow">Troubleshooting Workflow</h2> <h3 id="step-1---verify-the-service-exists">Step 1 - Verify the service exists</h3> <p>From Server:</p> https://my-it-blog.netlify.app/posts/tcp-ip-forwarding-failure/ Fri, 01 May 2026 00:00:00 +0000 https://my-it-blog.netlify.app/posts/tcp-ip-forwarding-failure/ <h1 id="-inter-interface-packet-forwarding-failure-investigation">🧪 Inter-Interface Packet Forwarding Failure Investigation</h1> <h2 id="-objective">📌 Objective</h2> <p>Diagnose why a client cannot reach the internet</p> <hr> <h2 id="-environment">⚙️ Environment</h2> <ul> <li>Virtualization: VirtualBox</li> <li>OS: ( 1 DHCP Server VM + 1 Client VM)</li> </ul> <hr> <h2 id="-lab-network-topology">🛠️ Lab Network Topology</h2> <p><strong>Server (DHCP)</strong></p> <ul> <li>IP: 192.168.10.10</li> <li>Interfaces: <ul> <li>enp0s8 -&gt; LAN</li> <li>enp0s3 -&gt; NAT</li> </ul> </li> </ul> <p><strong>Client VM</strong></p> <ul> <li>IP: 192.168.10.100</li> <li>Interface: enp0s8</li> <li>Gateway: 192.168.10.10</li> </ul> <hr> <h2 id="-incident-statement">🚨 Incident Statement</h2> <p>Client cannot access the internet</p> <hr> <h2 id="-phase-1--verify-the-problem">🔍 PHASE 1 — Verify the Problem</h2> <p>Run on Client VM:</p>