s common to access external services that do not have stable addresses, and instead rely on DNS. In this case, the DNS proxy will not have enough information to return a response, and will need to forward DNS requests upstream.</p><p>This is especially problematic with TCP traffic. Unlike HTTP requests, which are routed based on <code>Host</code> headers, TCP carries much less information; you can only route on the destination IP and port number. Because you don&rsquo;t have a stable IP for the backend, you