Port probes Port probes are used in Discovery by the Shazzam probe to detect protocol activity on open ports on devices it encounters. When a port probe encounters a protocol in use, the Shazzam sensor checks the port probe record to determine which classification probe to launch. The common protocols WMI, SSH, and SNMP in the base system have priority numbers that control the order in which they are launched. In the base system, the WMI probe is always launched first, and if it is successful on a device, no other port probes are launched for that device. If the WMI probe is not successful, then the SSH probe is launched to gather information on the device. If it is not successful, the SNMP probe is launched. This method allows Discovery to classify a device correctly if the device is running more than one protocol (e.g. SSH and SNMP). Port Probe Form To access the Port Probe form, navigate to Discovery Definition > Port Probes. The Port Probe form provides the following fields:Table 1. Port Probes Field Input Value Name Simple name for the port probe that reflects its function (e.g. snmp). Description Definition of the acronym for the protocol. (e.g. ssh is Secure Shell Login). Scanner Shazzam techniques for exploring a port. Some of these are protocol specific, and others are generic. For example, a WMI port probe will use a Scanner value of Generic TCP, and the snmp port probe uses a value of SNMP. Active Indicates whether this port probe is enabled or disabled. CIs Indicates whether this port probe is enabled or disabled for discovering "Configuration Items". IPs Indicates whether this port probe is enabled or disabled for discovering "IP addresses". Triggered by services Indicates which services define the port usage. Use this setting to define non-standard port usage and pair the port number with the protocol. Triggers probe Indicates which probe is triggered by the results of this port probe. This is the name of the appropriate classify probe. Use classification Names the appropriate classification table, based on the protocol being explored. Classification priority Establishes the priority in which this port probe runs. If the first port probe fails, then the next probe runs on the device, and so forth, until the correct data is returned. This allows for the proper classification of a device that has two running protocols, such as SSH and SNMP. The default priorities for the Discovery protocols are: 1 - WMI 2 - SSH 3 - SNMP Supplementary Launches supplementary classifications after a higher-priority identification succeeds, once again in order of priority. Conditional Runs this port probe if any one of the non-conditional probes return an open port. The conditional port probes in the out-of-box system attempt to resolve the names of Windows devices and DNS names. These ports probes take additional resources and are not used unless activity is detected on open ports. Script Script to run. Selective port probe scanning The order in which Port Probes are run is now prioritized by protocol. Prioritization enables the proper classification of devices that have two protocols running, such as SSH and SNMP, without having to create a complex Discovery Behavior. Previously (in Basic discoveries), Discovery launched all port probes at once and attempted to classify devices based on the activity returned for any protocol. The common protocols WMI, SSH, and SNMP in the out-of-box system now are assigned configurable priority numbers that control the order in which they are launched. The WMI probe is launched first, and if it is successful on a device, no other port probes are launched for that device. If the WMI probe is not successful, then the SSH probe is launched. The SNMP probe is the last to launch, after the other port probes have failed. The field called Classification priority was added to the Port Probe form. The out-of-box system prioritizes the use of port probes as follows: 1 - WMI 2 - SSH 3 - SNMP The WMI port probe runs first and then the WinRM probe. If WMI or WinRM activity is detected on a device, the Windows - Classify probe is launched (and no other port probes). If no WMI or WinRM activity is detected, Shazzam runs the SSH probe. If Shazzam successfully detects SSH activity, the UNIX classifier is launched. The SNMP port probe is launched only if no WMI or SSH activity is detected on a device. This ensures that the correct classifier probe is launched and the correct device data is returned. Configure Shazzam probe parametersWhen you run Discovery, the Shazzam probe finds your active network devices by scanning specified ports on specified IP address ranges.Shazzam probe, port probes, and protocolsPort scanning is the first step in the Discovery process. The Shazzam probe performs port scanning, regardless of whether you use patterns for horizontal discovery. The following table lists the known ports and protocols used by Discovery.