<%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.

i_round_blueThe sensor sends a series of User Datagram Protocol (UDP) packets from the source probe to a target probe and measures several parameters.

QoS (Quality of Service) One Way Sensor

QoS (Quality of Service) One Way Sensor

i_square_cyanFor a detailed list and descriptions of the channels that this sensor can show, see section Channel List.

Sensor in Other Languages

  • Dutch: QoS (Quality of Service) Eén Richting
  • French: QoS (qualité de service) unidirectionnel
  • German: QoS (Quality of Service) Unidirektional
  • Japanese: 一方向 QoS(Quality of Service)
  • Portuguese: Unidirecional QoS (qualidade de serviço)
  • Russian: Одностороннее качество обслуживания
  • Simplified Chinese: QoS (服务质量) 单向
  • Spanish: Unidireccional QoS (calidad de servicio)

Remarks

  • This sensor has a high performance impact. Use it with care. We recommend that you use no more than 200 sensors of this sensor type on each probe.
  • You must configure at least one remote probe in your PRTG Network Monitor setup for this sensor to work, and at least two remote probes in PRTG Hosted Monitor.
  • You can create this sensor on the probe device of a local probe or a remote probe.
  • This sensor only supports the IPv4 protocol.

i_podYou cannot add this sensor to the hosted probe of a PRTG Hosted Monitor instance. If you want to use this sensor, add it to a remote probe device.

Add Sensor

The Add Sensor dialog appears when you manually add a new sensor to a device. It only shows the settings that are required to create the sensor. You can change nearly all settings on the sensor's Settings tab after creation.

Basic Sensor Settings

Click the Settings tab of a sensor to change its settings.

Basic Sensor Settings

Basic Sensor Settings

Setting

Description

Sensor Name

Enter a name to identify the sensor. By default, PRTG shows this name in the device tree, as well as in alarms, logs, notifications, reports, maps, libraries, and tickets.

i_round_blueIf the name contains angle brackets (<>), PRTG replaces them with braces ({}) for security reasons. For more information, see the Knowledge Base: What security features does PRTG include?

Parent Tags

Shows tags that the sensor inherits from its parent device, parent group, and parent probe.

i_round_blueThis setting is for your information only. You cannot change it.

Tags

Enter one or more tags. Confirm each tag with the Spacebar key, a comma, or the Enter key. You can use tags to group objects and use tag-filtered views later on. Tags are not case-sensitive. Tags are automatically inherited.

i_round_blueIt is not possible to enter tags with a leading plus (+) or minus (-) sign, nor tags with parentheses (()) or angle brackets (<>).

i_round_blueFor performance reasons, it can take some minutes until you can filter for new tags that you added.

The sensor has the following default tags that are automatically predefined in the sensor's settings when you add the sensor:

  • qossensor

Priority

Select a priority for the sensor. This setting determines the position of the sensor in lists. The highest priority is at the top of a list. Choose from the lowest priority (i_priority_1) to the highest priority (i_priority_5).

i_round_blueUsually, a sensor connects to the IP Address/DNS Name of the parent device. See the device settings for details. For some sensors, you can explicitly define the monitoring target in the sensor settings.

Quality of Service Measurement

Quality of Service Measurement

Quality of Service Measurement

Setting

Description

Timeout (Sec.)

Enter a timeout in seconds for the request. Enter an integer. The maximum timeout value is 900 seconds (15 minutes).

i_round_blueIf the reply takes longer than this value, the sensor cancels the request and shows a corresponding error message.

Target Probe

Define the target probe that receives the UDP packets. The dropdown list shows all local probes and remote probes in your setup.

If you want to run the sensor on the local probe, select a remote probe as the Target Probe. If no remote probe is available, install and connect a remote probe first.

If you want to run the sensor on a remote probe, select either a different remote probe or the local probe as the target. The sensor measures values for the network track between the parent probe and the target probe.

i_round_redYou must ensure that firewalls or network address translation (NAT) rules allow UDP packets to reach the target probe. The probe automatically opens the Windows firewall on the target system.

i_podIn PRTG Hosted Monitor, you can only select a different remote probe as the target probe. QoS measurements for connections to the hosted probe are not possible.

Target Host/IP Address

Define the IP address of the target probe.

i_round_blueIf you do not use NAT rules, this is usually the IP address in parentheses next to the probe name under Target Probe.

Port

Define the source and target port for the UDP packets. Both the source probe and the target probe use this port. Enter an integer. The default port is 50000. PRTG supports the port numbers 1024-65536 for UDP packets.

i_round_redUse a different port for each QoS (Quality of Service) One Way sensor to make sure that packets can be assigned correctly.

i_round_redThe port must be available on both the source system and the target system.

Number of Packets

Define the number of packets that the sensor sends with each scanning interval. Enter an integer. The default value is 1000. The minimum value is 10. The maximum value is 1000.

i_round_blueWe recommend that you use the default value.

Packet Size (Bytes)

Define the size of the packets in bytes that the sensor sends. Enter an integer. The default value is 172. The minimum value is 172. The maximum value is 4500.

i_round_blueWe recommend that you use the default value.

Packet Delay (ms)

Define the time in milliseconds (ms) that the sensor waits between two packets. Enter an integer. The default value is 20. The minimum value is 10. The maximum value is 1000.

i_round_blueWe recommend that you use the default value.

Sensor Display

Sensor Display

Sensor Display

Setting

Description

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 is always displayed below the sensor's name. The available options depend on what channels are available for this sensor.

i_round_blueYou can set a different primary channel later by clicking b_channel_primary below a channel gauge on the sensor's Overview tab.

Graph Type

Define how different channels are shown for this sensor:

  • Show channels independently (default): Show a graph for each channel.
  • Stack channels on top of each other: Stack channels on top of each other to create a multi-channel graph. This generates a graph that visualizes the different components of your total traffic.
    i_round_redYou cannot use this option in combination with manual Vertical Axis Scaling (available in the channel settings).

Stack Unit

This setting is only visible if you enable Stack channels on top of each other as Graph Type. Select a unit from the list. All channels with this unit are 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.

Inherited Settings

By default, all of these settings are inherited from objects that are higher in the hierarchy. We recommend that you change them centrally in the root group settings if necessary. To change a setting for this object only, click b_inherited_enabled under the corresponding setting name to disable the inheritance and to display its options.

i_square_cyanFor more information, see section Inheritance of Settings.

Scanning Interval

Scanning Interval

Scanning Interval

i_square_cyanFor more information, see section Root Group Settings, section Scanning Interval.

Schedules, Dependencies, and Maintenance Window

i_round_blueYou cannot interrupt the inheritance for schedules, dependencies, and maintenance windows. The corresponding settings from the parent objects are always active. However, you can define additional schedules, dependencies, and maintenance windows. They are active at the same time as the parent objects' settings.

Schedules, Dependencies, and Maintenance Window

Schedules, Dependencies, and Maintenance Window

i_square_cyanFor more information, see section Root Group Settings, section Schedules, Dependencies, and Maintenance Window.

Access Rights

Access Rights

Access Rights

i_square_cyanFor more information, see section Root Group Settings, section Access Rights.

Channel List

i_round_blueWhich channels the sensor actually shows might depend on the target device, the available components, and the sensor setup.

Channel

Description

Downtime

In the channel table on the Overview tab, this channel never shows any values. PRTG uses this channel in graphs and reports to show the amount of time in which the sensor was in the Down status in percent.

Jitter Average

The average jitter in milliseconds (ms)

Jitter Max

The maximum jitter in ms

i_round_blueThis channel is the primary channel by default.

Jitter Min

The minimum jitter in ms

Packet Delay Variation Average

The average packet delay variation in ms

Packet Delay Variation Max

The maximum packet delay variation in ms

Packet Delay Variation Min

The minimum packet delay variation in ms

Packets Corrupted

The corrupted packets in percent

Packets Duplicated

The duplicated packets in percent

Packets Lost

The lost packets in percent

Packets Out Of Order

The out of order packets in percent

Time To Last Packet

The time to the last packet in msec

More

i_square_blueKNOWLEDGE BASE

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