</p><h3 id=tcp>TCP</h3><p>When processing TCP traffic, Istio has a very small amount of useful information to route the connection - only the destination IP and Port.
These attributes are used to determine the intended Service; the proxy is configured to listen on each service IP (<code>&lt;Kubernetes ClusterIP>:&lt;Port></code>) pair and forward traffic to the upstream service.</p><p>For customizations, a TCP <code>VirtualService</code> can be configured, which allows <a href=/v1.12/docs/reference/config/n