https://aperturezone.com/tags/routage/ Recent content in Routage on Aperture Zone https://aperturezone.com/logo.webp https://aperturezone.com/logo.webp Hugo -- gohugo.io fr-fr Sat, 25 Jul 2026 00:00:00 +0000 https://aperturezone.com/posts/ip/ Sat, 25 Jul 2026 00:00:00 +0000 https://aperturezone.com/posts/ip/ <p>Third floor. We covered <a href="https://aperturezone.fr/posts/rj45/">cables</a> — Layer 1. We covered <a href="https://aperturezone.fr/posts/mac-addresses/">MAC addresses and Layer 2</a>.</p> <p>Layer 2 has a structural limitation, and it’s brutal: <strong>it doesn’t scale</strong>. To find someone, it shouts down the hallway (broadcast). It works with thirty. With three billion, it’s a joke. And MAC addresses are <strong>flat</strong>: <code>00:1A:2B:3C:4D:5E</code> tells you nothing about where the machine is located. No structure, no hierarchy, nothing to aggregate. A global router would have to know every network card on the planet, one by one.</p>