e <code>sock_map</code> is a &ldquo;quadruple&rdquo; of source and destination addresses and ports. With the key and the rules stored in the map, the destination socket will be found when a new packet arrives.</p><h2 id=the-merbridge-approach>The Merbridge approach</h2><p>Let&rsquo;s introduce the detailed design and implementation principles of Merbridge step by step, with a real scenario.</p><h3 id=istio-sidecar-traffic-interception-based-on-iptables>Istio sidecar traffic interception based on iptables</h