When two ClearPass nodes are a members of a cluster, is it possible to use the publisher's IP as a cluster IP? For radius authentication is it enough to use only the publisher's IP, or should we set the subscriber's IP as a fallback radius server? Amigopod used a cluster IP to act as one server but there is no option to set the cluster IP at ClearPass. I'm afraid the ClearPass cluster is only about DB synchronization. How does the ClearPass cluster work when I need to use it as a captive portal? Is it not possible to define a fallback portal in the controller. Do I need some extra clustering HW/SW to have a HA captive portal? Which interface does the subscriber node use for heartbeat signalization? The management, the data or both?