<%NUMBERING1%>.<%NUMBERING2%>.<%NUMBERING3%> PRTG Manual: QoS (Quality of Service) One Way Sensor
The QoS (Quality of Service) One Way sensor monitors parameters regarding the quality of a network connection between two probes, which is important, for example, when using Voice over IP (VoIP) over this connection. The sensor sends a series of UDP packets from the parent probe to another probe and measures packet loss, jitter, Packet Delay Variation (PDV), etc.
Note: In order for this sensor to work, there has to be at least one remote probe configured in your setup. The sensor can be created on the Probe Device of either a local or remote probe.
Note: This sensor type cannot be cloned using the Clone Object function.
For a general introduction to the technology behind Quality of Service monitoring, please see Monitoring Quality of Service section.
The Add Sensor dialog appears when adding a new sensor on a device manually. It only shows the setting fields that are imperative for creating the sensor. Therefore, you will not see all setting fields in this dialog. You can change all settings in the sensor's Settings tab later.
On the sensor's details page, click on the Settings tab to change settings.
Note: If not set explicitly in a sensor's settings, it will connect to the IP Address or DNS Name defined in the settings of the parent device the sensor is created on.
Basic Sensor Settings |
|
---|---|
Sensor Name |
Enter a meaningful name to identify the sensor. The name will be shown by default in the device tree and in all alarms. |
Tags |
Enter one or more tags, separated by space or comma. You can use tags to group sensors and use tag-filtered views later on. Tags are not case sensitive. We recommend using the default value. You can add additional tags to it, if you like. Other tags are automatically inherited from objects further up in the device tree. Those are not visible here. |
Priority |
Select a priority for the sensor. This setting determines where the sensor will be placed in sensor lists. Top priority will be at the top of a list. You can choose from one star (low priority) to five stars (top priority). |
Quality of Service Measurement |
|
Timeout (Sec.) |
Enter a timeout in seconds for the request. If the reply takes longer than this value the request is aborted and an error message is triggered. The maximum timeout is 900 seconds (15 minutes). |
Target Probe |
Define the target probe that will receive the UDP packets. In the drop down menu, all local and remote probes of your setup are shown. When running the sensor on the local probe, select a remote probe as Target Probe; if no remote probe is available, please install and connect a remote probe first. When running the sensor on a remote probe, select either another remote probe or the local probe as target. The sensor will measure values for the network track between the probe the sensor is created on and the target probe. Note: You must ensure that firewalls, NAT rules, etc. will allow the UDP packets to reach the target probe. The Windows firewall on the target system will be automatically opened by the probe. |
Target Host/IP |
Define the IP address of the target probe to which the probe the sensor is created on will connect. When you're not using NAT rules, this is usually the address shown above next to the target probe's name. |
Port |
Define the source and target port for the UDP packets. This port will be used on both the source and target probe. Please use a different port for each QoS sensor to make sure packets can be assigned correctly. Enter an integer value between 1024 and 65536. Note: This port must be available on both the source and target system. |
Number of Packets |
Define how many packets are sent for each scanning interval. We recommend using 1000. Please enter an integer value. |
Size of Packets (Bytes) |
Define the size in bytes of the packets sent. We recommend using 172. Please enter an integer value. |
Time between Packets (ms) |
Define the size in milliseconds that will be waited between two packets. We recommend using 20. Please enter an integer value. |
Sensor Display |
|
---|---|
Primary Channel |
Select a channel from the list to define it as the primary channel. In the device tree, the last value of the primary channel will always be displayed underneath the sensor's name. The available options depend on what channels are available for this sensor. Note: You can set another primary channel later by clicking on the pin symbol of a channel in the sensor's overview tab. |
Chart Type |
Define how different channels will be shown for this sensor.
|
Stack Unit |
This setting is only available if stacked graphs are selected above. Choose a unit from the list. All channels with this unit will be stacked on top of each other. By default, you cannot exclude single channels from stacking, if they use the selected unit. However, there is an advanced procedure to do so. |
By default, all following settings are inherited from objects higher in the hierarchy and should be changed there, if necessary. Often, best practice is to change them centrally in the Root group's settings. To change a setting for this object, disable inheritance by clicking on the check mark symbol in front of the respective setting name. You will then see the options described below.
Scanning Interval |
|
Scanning Interval |
The scanning interval determines the time the sensor waits between two scans. Select a scanning interval (seconds, minutes, or hours) from the list. You can change the available intervals in the system administration. |
When a Sensor Reports an Error |
With this setting, you can define the number of scanning intervals a sensor has to report an error until the sensor will be set to a Down status. The sensor can try reaching a device several times, depending on your setup you can specify here, to help avoid false alarms if the monitored device has only temporary issues. For previous scanning intervals with failed requests, the sensor will show a Warning status. Choose between:
Note: Sensors that monitor via Windows Management Instrumentation (WMI) will always wait at least one scanning interval until an error is shown. It is not possible to set a WMI sensor "down" immediately, so the first option will not apply to these sensor types (all other options can apply). Note: If a sensor has defined error limits for channels, this sensor will always be set to a Down status immediately, so no "wait" option will apply. |
Schedules, Dependencies, and Maintenance Window |
|
---|---|
Note: Inheritance for schedules, dependencies, and maintenance windows cannot be interrupted; the according settings from the parent objects will always be active. However, you can define additional settings here. They will be active in parallel to the parent objects' settings. |
|
Schedule |
Select a schedule from the list. Schedules can be used to monitor for a certain time span (days, hours) throughout the week. With the period list option it is also possible to pause monitoring for a specific time span. You can create new schedules and edit existing ones in the account settings. Note: Schedules are generally inherited. New schedules will be added to existing ones, so all schedules are active. |
Maintenance Window |
Specify if you want to set-up a one-time maintenance window. During a maintenance window this object and all child objects will not be monitored. They will enter a paused state then. Choose between:
|
Maintenance Begins At |
This field is only visible if maintenance window is enabled above. Use the date time picker to enter the start date and time of the maintenance window. |
Maintenance End At |
This field is only visible if maintenance window is enabled above. Use the date time picker to enter the end date and time of the maintenance window. |
Dependency Type |
Define a dependency type. Dependencies can be used to pause monitoring for an object depending on the status of another. You can choose between:
Note: Testing your dependencies is easy! Simply choose Simulate Error Status from the context menu of an object that other objects depend on. A few seconds later all dependent objects should be paused. You can check all dependencies in your PRTG installation by selecting Devices | Dependencies from the main menu bar. |
Dependency |
This field is only visible if the select object option is enabled above. Click on the reading-glass symbol and use the object selector to choose an object on which the current sensor will be dependent on. |
Delay (Seconds) |
Define a time span. After the master object for this dependency comes back to an Up status, monitoring of the depending objects will be additionally delayed by the defined time span. This can help avoid false alarms, for example, after a server restart, by giving systems more time for all services to start up. Please enter an integer value in seconds. Note: This setting is not available if you choose this sensor to be the Master object for parent. In this case, please define delays in the parent Device Settings or the superior Group Settings. |
Access Rights |
|
User Group Access |
Define which user group(s) will have access to the object you're editing. A table with user groups and right is shown; it contains all user groups from your setup. For each user group you can choose from the following access rights:
You can create new user groups in the System Administration—User Groups settings. To automatically set all objects further down in the hierarchy to inherit this object's access rights, set a check mark for the Revert children's access rights to inherited option. For more details about access rights, please see section User Access Rights. |
In order to change display settings, spike filter, and limits, please switch to the sensor's Overview tab and click on the gear icon of a specific channel. For detailed information, please see Sensor Channels Settings section.
Click on the Notifications tab to change notification triggers. For detailed information, please see Sensor Notifications Settings section.
For more general information about settings, please see Object Settings section.
For information about sensor settings, please see the following sections:
Keywords: