-The _LTTng relay daemon_ is responsible for receiving trace data from
-possibly remote LTTng session/consumer daemons and for writing it to
-the local file system. The relay daemon also accepts _LTTng live_
-connections from compatible viewers; this is the official approach to
-viewing LTTng events as they are emitted.
+By default, a relay daemon listens on all network interfaces to receive
+trace data, but only on `localhost` for LTTng live connections. Override
+the listening URLs with the option:--control-port, option:--data-port,
+and option:--live-port options (see the <<url-format,URL format>>
+section below). For example, use the
+option:--live-port=+tcp://0.0.0.0:{default_network_viewer_port}+ option
+to make a relay daemon listen to LTTng live connections on all network
+interfaces.