Rule Base Rule Base Parser (R Response - Server Coordinator (R Communicator Heartbeat D Grey implies that the module is required. Figure 3.2 Extended Architecture If a denial of service attack is being carried out against a host, then the host will not be able to respond to external detector probes. Similarly, this may hinder responses to attacks. It may be more advantageous in this case to simply run a copy of the IDS on that host and have the IDS download response agents/detectors to the host and run them on the fly. 3.2.1 Communicator The communicator is a special module that handles all of the communication between the hosts of the network. The communicator acts both as a response agent and as a detector. If the rules in the rule base demand that a message be sent out to a remote host