<%NUMBERING1%>.<%NUMBERING2%>.<%NUMBERING3%> PRTG Manual: NetFlow v9 Sensor
The NetFlow v9 sensor receives traffic data from a NetFlow v9-compatible device and shows the traffic by type. This sensor has several filter options to divide traffic into different channels.
Make sure that the sensor matches the NetFlow version that your device exports.
NetFlow v9 Sensor
For a detailed list and descriptions of the channels that this sensor can show, see section Channel List.
Sensor in Other Languages
- Dutch: NetFlow v9
- French: NetFlow v9
- German: NetFlow v9
- Japanese: NetFlow v9
- Portuguese: NetFlow v9
- Russian: NetFlow v9
- Simplified Chinese: NetFlow v9
- Spanish: NetFlow v9
Remarks
You 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
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Sensor Name
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Enter a name to identify the sensor.
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Parent Tags
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Shows tags that the sensor inherits from its parent device, parent group, and parent probe.
This setting is for your information only. You cannot change it.
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Tags
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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.
It is not possible to enter tags with a leading plus (+) or minus (-) sign, nor tags with parentheses (()) or angle brackets (<>).
For 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:
- bandwidthsensor
- netflowsensor
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Priority
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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 () to the highest priority ().
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NetFlow v9 Specific Settings
NetFlow v9 Specific Settings
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Receive Packets on UDP Port
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Enter the User Datagram Protocol (UDP) port number on which the flow packets are received. It must match the UDP port number in the NetFlow export options of the hardware router device. Enter an integer.
When you configure the export, make sure that you select the appropriate NetFlow version for this sensor.
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Sender IP Address
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Enter the IP address of the sending device that you want to receive the NetFlow from. Enter an IP address to only receive data from a specific device or leave the field empty to receive data from any device on the specified port.
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Receive Packets on IP Address
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Select the IP addresses on which PRTG listens to NetFlow packets. The list of IP addresses is specific to your setup. To select an IP address, enable a check box in front of the respective line. The IP address that you select must match the IP address in the NetFlow export options of the hardware router device.
When you configure the export, make sure that you select the appropriate NetFlow version for this sensor.
You can also select all items or cancel the selection by using the check box in the table header.
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Active Flow Timeout (Minutes)
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Enter a time span in minutes after which the sensor must receive new flow data. If the timeout elapses and the sensor receives no new data during this time, it shows the Unknown status. Enter an integer. The maximum timeout is 60 minutes.
We recommend that you set the timeout one minute longer than the timeout in the hardware router device.
If you set this value too low, flow information might be lost.
For more details, see the Knowledge Base: What is the Active Flow Timeout in flow sensors?
If the target device sends incorrect time information that results in wrong monitoring data, try to use 0 as active flow timeout. This ignores the start and stop information of a flow as provided by the device and accounts all data to the current point in time. It might result in spikes but all data is captured.
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Sampling Mode
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Define if you want to use the sampling mode:
- Off: Use the standard flow.
- On: Use the sampling mode and specify the Sampling Rate below.
This setting must match the setting in the xFlow exporter.
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Sampling Rate
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This setting is only visible if you select On above. Enter a number that matches the sampling rate in the exporting device. If the number is different, monitoring results will be incorrect. Enter an integer.
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Stream Data Handling
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Define what PRTG does with the stream and packet data:
- Discard stream data (recommended): Do not store the stream and packet data.
- Store stream data only for the 'Other' channel: Only store stream and packet data that is not otherwise filtered and is therefore accounted to the default Other channel. PRTG stores this data in the \StreamLog subfolder of the PRTG data directory on the probe system. The file name is Streams Sensor [ID] (1).csv. This setting is for debugging purposes. PRTG overwrites this file with each scanning interval.
- Store all stream data: Store all stream and packet data. This setting is for debugging purposes. PRTG overwrites this file with each scanning interval.
Use with caution. If you enable this setting, it can create huge data files. We recommend that you only use this setting for a short time.
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Channel Configuration
Channel Configuration
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Channel Selection
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Define the categories that the sensor accounts the traffic to:
- Web: Internet web traffic.
- File Transfer: Traffic from FTP.
- Mail: Internet mail traffic.
- Chat: Traffic from chat and instant messaging.
- Remote Control: Traffic from remote control applications such as RDP, SSH, Telnet, and VNC.
- Infrastructure: Traffic from network services such as DHCP, DNS, Ident, ICMP, and SNMP.
- NetBIOS: Traffic from NetBIOS communication.
- Citrix: Traffic from Citrix applications.
- Other Protocols: Traffic from various other protocols via UDP and TCP.
For each group, you can select how many channels the sensor uses, that is, how detailed the sensor divides the traffic. For each group, choose from:
- No (): Do not account traffic of this group in its own channel. The sensor accounts all traffic of this group to the default channel named Other.
- Yes (): Count all traffic of this group and summarize it in one channel.
- Detail (): Count all traffic of this group and further divide it into different channels. The traffic appears in several channels that you can see in the Content column.
Extensive use of this option can cause load problems on the probe system. We recommend that you set specific, well-chosen filters for the data that you really want to analyze.
You can change the default configuration for groups and channels. For details, see the Knowledge Base: How can I change the default groups and channels for flow and Packet Sniffer sensors?
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Filtering
For detailed information, see section Filter Rules.
Filtering
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Include Filter
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Define if you want to filter any traffic. If you leave this field empty, the sensor includes all traffic. To include specific traffic only, define filters using a special syntax.
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Exclude Filter
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First, the sensor considers the filters in Include Filter. From this subset, you can explicitly exclude traffic, using the same syntax.
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Sensor Display
Sensor Display
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Primary Channel
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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.
You can set a different primary channel later by clicking below a channel gauge on the sensor's Overview tab.
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Graph Type
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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.
You cannot use this option in combination with manual Vertical Axis Scaling (available in the channel settings).
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Stack Unit
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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.
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Primary Toplist
Primary Toplist
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Primary Toplist
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Define which Toplist is the primary Toplist of the sensor:
- Top Talkers
- Top Connections
- Top Protocols
- [Any custom Toplists you add]
PRTG shows the primary Toplist in maps when you add a Toplist object.
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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 under the corresponding setting name to disable the inheritance and to display its options.
For more information, see section Inheritance of Settings.
Scanning Interval
Scanning Interval
For more information, see section Root Group Settings, section Scanning Interval.
Schedules, Dependencies, and Maintenance Window
You 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
For more information, see section Root Group Settings, section Schedules, Dependencies, and Maintenance Window.
Access Rights
Access Rights
For more information, see section Root Group Settings, section Access Rights.
Channel Unit Configuration
Channel Unit Configuration
For more information, see section Root Group Settings, section Channel Unit Configuration.
Toplists
For all Flow (NetFlow, jFlow, sFlow, IPFIX) and Packet Sniffer sensors, Toplists are available on the sensor's Overview tab. Using Toplists, you can review traffic data for small time periods in great detail.
For more information, see section Toplists.
Filter Rules
The following filter rules apply to all Flow (NetFlow, jFlow, sFlow, IPFIX) and Packet Sniffer sensors.
For more information, see section Filter Rules for Flow, IPFIX, and Packet Sniffer Sensors.
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IP
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IP address or DNS name
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Port
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Any number
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SourceIP
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IP address or DNS name
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SourcePort
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Any number
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DestinationIP
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IP address or DNS name
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DestinationPort
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Any number
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Protocol
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Transmission Control Protocol (TCP), User Datagram Protocol (UDP), Internet Control Message Protocol (ICMP), Open Shortest Path First (OSPF), any number
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ToS
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Type of Service (ToS): any number
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DSCP
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Differentiated Services Code Point (DSCP): any number
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The following filter rules apply to NetFlow v9 sensors only.
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Interface
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Any number
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ASI
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Any number
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InboundInterface
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Any number
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OutboundInterface
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Any number
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SenderIP
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IP address of the sending device. Use this if you have several devices that send flow data on the same port, and you want to divide the traffic of each device into a different channel.
Possible values: IP address or DNS name
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SourceASI
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Any number
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DestinationASI
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Any number
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MAC
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Physical address
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SourceMAC
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Physical address
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DestinationMAC
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Physical address
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Mask
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Mask values represent subnet masks in the form of a single number (number of contiguous bits).
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DestinationMask
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Mask values represent subnet masks in the form of a single number (number of contiguous bits).
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NextHop
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IP address or DNS name
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VLAN
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VLAN values represent a VLAN identifier (any number).
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SourceVLAN
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VLAN values represent a VLAN identifier (any number).
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DestinationVLAN
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VLAN values represent a VLAN identifier (any number).
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Channel List
Which channels the sensor actually shows might depend on the target device, the available components, and the sensor setup.
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Chat
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The traffic from chat and instant messaging (Internet Relay Chat (IRC), AOL Instant Messenger (AIM)) in bytes per second
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Citrix
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The traffic from Citrix applications in bytes per second
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Downtime
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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.
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FTP/P2P
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The traffic from file transfer (File Transfer Protocol (FTP)/Peer-to-Peer (P2P)) in bytes per second
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Infrastructure
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The traffic from network services (Dynamic Host Configuration Protocol (DHCP), Domain Name System (DNS), Ident, Internet Control Message Protocol (ICMP), Simple Network Management Protocol (SNMP)) in bytes per second
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Mail
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The internet mail traffic (Internet Message Access Protocol (IMAP), Post Office Protocol version 3 (POP3), Simple Mail Transfer Protocol (SMTP)) in bytes per second
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NetBIOS
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The traffic from NetBIOS communication in bytes per second
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Other
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The traffic from various other protocols (User Datagram Protocol (UDP), Transmission Control Protocol (TCP)) in bytes per second
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Remote Control
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The traffic from remote control applications (Remote Desktop Protocol (RDP), Secure Shell (SSH), Telnet, Virtual Network Computing (VNC)) in bytes per second
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Total
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The total traffic in bytes per second
This channel is the primary channel by default.
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Various
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The traffic from various other sources in bytes per second
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WWW
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The traffic from the web (HTTP, HTTPS) in bytes per second
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More
Knowledge Base
What is the Active Flow Timeout in flow sensors?
How can I change the default groups and channels for flow and Packet Sniffer sensors?
What security features does PRTG include?
Where is the volume line in graphs?
PAESSLER TOOLS
NetFlow Tester