Measurement Group

Scopemon is configured via parameters. This reference lists all available parameters, default values, allowed values, and use examples for the measurement.

1. General #

1.1. measurement_description #

Verbose description of the measurement. This value is written to results files as metadata.

• Type: string
• Default: [empty]

Example
To name this measurement “My measurement”, define this parameter as:

[Measurement]
measurement_description=My measurement

1.2. measurement_start_offset #

Artificially delay the start of the measurement by the given time. If the value is 0, the measurement starts as soon as possible once triggered.

• Unit: milliseconds
• Precision: integer
• Minimum: 0
• Default: 0

Example
To delay the start of the measurement by 1 second, define this parameter as:

[Measurement]
measurement_start_offset=1000

1.3. reconnect_interval #

If a connection cannot be established to the primary Probe, Scopemon waits for a duration specified by this parameter and then attempts to reconnect.

• Unit: milliseconds
• Precision: integer
• Minimum: 0
• Default: 1000

Example
To attempt a reconnection after 500 milliseconds, define this parameter as:

[Measurement]
reconnect_interval=500

1.4. robust_mode_max_cbd #

This parameter defines the maximum connection break duration allowed in the QMCP connections related to the measurement session. If a connection break is longer than the defined value, the measurement session will end to a timeout error.

• Unit: minutes
• Precision: integer
• Minimum: 1
• Default: 10

Example
To allow connection breaks of maximum of three minutes, define this parameter as:

[Measurement]
robust_mode_max_cbd=3

1.5. user_id #

User ID can be used to identify a controller, i.e., the Qosium Scopemon instance in this case. You can set this freely. The set value will appear in the results, where it can be used as a parameter to find results. Thus, you can use this as you wish as an identifier for your measurement, devices, etc., in a large-scale measurement setup.

• Precision: integer
• Minimum: 0
• Maximum: 4294967295
• Default: 0

Example
To set an id of 6 for this client, define this parameter as:

[Measurement]
user_id=6

2. Topology #

2.1. primary_probe_hostname #

The hostname (or directly the IPv4 address) of the primary Probe. This can be omitted if the Probe is located on the same device where Scopemon is used.

• Type: string
• Default: 127.0.0.1

Example
If the primary Probe is installed in another device at myhost.home, define this parameter as:

[Measurement]
primary_probe_hostname=myhost.home

2.2. primary_probe_port #

The port number of the primary Probe. This can be typically omitted unless the port where Probe serves control connections has been changed in Probe configuration.

• Precision: integer
• Minimum: 0
• Maximum: 65535
• Default: 8177

Example
If Probe is configured to serve control connections on port 9776, define this parameter as:

[Measurement]
primary_probe_port=9776

2.3. use_secondary_probe #

By default, measurement is performed with one Probe. With this setting, it’s possible to set a two-point measurement.

• Values:
  • true - Perform a two-point measurement
  • false - Perform a single-point measurement
• Default: false

Example
To perform a two-point measurement using the Probe at 192.168.1.14 and interface #4, set as follows:

[Measurement]
use_secondary_probe=false
secondary_probe_hostname=192.168.1.14
secondary_probe_interface_index=4

2.4. secondary_probe_hostname #

The hostname (or directly the IPv4 address) of the secondary Probe.

• Type: string
• Default: 127.0.0.1

Example
If a secondary Probe is installed in another device at IP address 192.168.1.43, define this parameter as:

[Measurement]
secondary_probe_hostname=192.168.1.43

2.5. secondary_probe_port #

The port number of the secondary Probe. This can be typically omitted unless the port where Probe serves control connections has been changed in Probe configuration.

• Precision: integer
• Minimum: 0
• Maximum: 65535
• Default: 8177

Example
If Probe is configured to serve control connections on port 9778, define this parameter as:

[Measurement]
secondary_probe_port=9778

2.6. primary_probe_placement #

The topological placement of the primary Probe.

• Values:
  • 10 Measurement end-point - Probe is in either one of the endpoints of the measured traffic. In other words, the device Probe is installed to is either sending or receiving the measured network traffic.
  • 100 Within measured path - Probe is not located at either one of the end-points but instead resides somewhere along the path where the measured traffic traverses.
  • 200 Off-path - Probe is not located within the measurement path at all. This is the case, e.g., when the Probe is located in a separate device where the traffic to be measured is mirrored.
• Default: 10

2.7. primary_probe_interface_index #

This parameter defines the capture interface of the primary Probe to be used in the measurement. The interface numbering in a device is unique per Qosium installation. Thus, once Qosium Probe is installed on a device, a particular NIC will always have the same interface index. The numbering can change if Qosium Probe is removed and reinstalled.

• Precision: integer
• Minimum: 0
• Default: 0

Example
If desired the capture interface has index of 2, define this parameter as:

[Measurement]
primary_probe_interface_index=2

2.8. secondary_probe_interface_index #

This parameter defines the capture interface of the secondary Probe to be used in the measurement.

• Precision: integer
• Minimum: 0
• Default: 0

Example
If the index of the desired capture interface is 2, define this parameter as:

[Measurement]
secondary_probe_interface_index=2

2.9. secondary_probe_placement #

The topological placement of the secondary Probe.

• Values:
  • 10 Measurement end-point - Probe is in either one of the endpoints of the measured traffic. In other words, the device Probe is installed to is either sending or receiving the measured network traffic
  • 100 Within measured path - Probe is not located at either one of the end-points but instead resides somewhere along the path where the measured traffic traverses
  • 200 Off-path - Probe is not located within the measurement path at all. This is the case, e.g., when the Probe is located in a separate device where the traffic to be measured is mirrored.
• Default: 10

2.10. nat_between_probes #

Qosium needs to be aware if a NATNetwork Address Translation
A technique for remapping an IP address space occurs between Probes. If this is the case, enable this parameter.

• Values:
  • true - There’s a NAT occurring between Probes
  • false - No NAT is occurring between Probes
• Default: false

3. Filtering #

Packet filter is one of the most important parameters, as it defines which traffic is measured. The packet filter needs to be strict enough so that no irrelevant traffic is captured. Otherwise, the results may not be useful.

3.1. packet_filter_mode #

This parameter determines the mode in which packets are filtered. In most cases, the selection is between Automatic, which generates an automatic filter, or Manual , which allows the use of a manual filter defined in packet_filter. For more information, see Packet Filters in Qosium.

• Values:
  • 220 Manual - Packet filter is defined manually in packet_filter. In a two-point measurement, this filter is used in the secondary Probe as well.
  • 240 Automatic - Generates automatically a filter, which includes all IP traffic between the hosts (a two-point measurement) or the measurement point’s own IP traffic (a single-point measurement). The parameter packet_filter will be ignored.
  • 231 Automatic for secondary (strict) - This mode is meant for cases where a NATNetwork Address Translation
    A technique for remapping an IP address space is between the measurement points in a two-point measurement. The filter is set manually for the primary Probe, but Qosium generates an automatic filter for the secondary Probe. The generated filter will be strict, focusing on a single flow, so define the primary Probe filter to be strict as well.
  • 233 Automatic for secondary (light) - This mode is similar to the previous, but now a loose automatic filter is generated for the secondary Probe. A loose filter includes only addresses, so all traffic traveling between these addresses will be included. Remember to define the primary Probe’s manual filter to be loose as well.
• Default: 240

Example

[Measurement]
packet_filter_mode=231

3.2. packet_filter #

When packet_filter_mode is Manual, use this parameter to define the filter. In addition, when using the NATNetwork Address Translation
A technique for remapping an IP address space automatic filtering modes, the primary Probe filter is defined here.

• Type: string
• Default: ip

For more information, see Packet Filters in Qosium.

Example
To enable monitoring only for UDPUser Datagram Protocol
A simple, fast, unreliable transport protocol. traffic going through ports 6889 or 6890, define this parameter as:

[Measurement]
packet_filter=udp port 6889 or udp port 6890

4. Senders #

Sometimes it is not clear which way the traffic is traveling in the network. In these cases, you need to tell it to Qosium by defining senders manually. See Direction of Traffic and Senders under concepts section for more information what the senders mean.

In a single-point measurement, you need to define the senders manually if Probe’s placement is Off-path.

In a two-point measurement, you need to define the senders manually in the following cases:

• If both Probes are Off-path, you need to define senders for both manually.
• If one Probe is Off-path and the other is Within path, you need to define the senders manually for the Off-path Probe.

Otherwise, Qosium defines the senders automatically, and the following parameters in this category are ignored.

4.1. primary_probe_senders_pure_mac_method_enabled #

Determines whether the pure MAC method is used for defining primary Probe senders. When enabled, the senders are defined only based on MAC addresses and no other senders settings are required for the primary Probe.

• Values:
  • true - Pure MAC method is used
  • false - Pure MAC method is not used
• Default: false

4.2. primary_probe_senders_eth_mode #

The Ethernet senders mode of the primary Probe.

• Values:
  • 0 Auto-search - Use the Ethernet addresses of the device’s interfaces as senders.
  • 249 Manual - Input sender addresses manually.
  • 250 Inverse definition - The senders are defined according to the senders of the secondary Probe.
  • 252 Mask - Define the senders manually by using a mask instead of individual addresses.
• Default: 0

Example

[Measurement]
primary_probe_senders_eth_mode=249

4.3. primary_probe_senders_eth_address_list #

The manual Ethernet senders list of the local Probe. Used only when primary_probe_senders_eth_mode is set to manual or mask mode.

Example (Manual mode)

[Measurement]
primary_probe_senders_eth_address_list/size=2
primary_probe_senders_eth_address_list/1/address=12:34:56:78:9a:bc
primary_probe_senders_eth_address_list/2/address=12:34:56:78:9a:bd

4.4. primary_probe_senders_ipv4_mode #

The IPv4 senders mode of the primary Probe.

• Values:
  • 0 Auto-search - Use the IPv4 addresses of the device’s interfaces as senders.
  • 249 Manual - Input sender addresses manually.
  • 250 Inverse definition - The senders are defined according to the senders of the secondary Probe.
  • 252 Mask - Define the senders manually by using a network mask instead of individual addresses.
• Default: 0

Example

[Measurement]
primary_probe_senders_ipv4_mode=252

4.5. primary_probe_senders_ipv4_address_list #

The manual IPv4 senders list of the local Probe. Used only when primary_probe_senders_ipv4_mode is set to Manual or Mask mode.

Example (Mask mode)

[Measurement]
primary_probe_senders_ipv4_address_list/size=1
primary_probe_senders_ipv4_address_list/1/address=192.168.1.0
primary_probe_senders_ipv4_address_list/1/value=255.255.255.0

4.6. primary_probe_senders_ipv6_mode #

The IPv6 senders mode of the primary Probe.

• Values:
  • 0 Auto-search - Use the IPv6 addresses of the device’s interfaces as senders.
  • 249 Manual - Input sender addresses manually.
  • 250 Inverse definition - The senders are defined according to the senders of the secondary Probe.
  • 252 Mask - Define the senders manually by using a network mask instead of individual addresses.
• Default: 0

Example

[Measurement]
primary_probe_senders_ipv6_mode=249

4.7. primary_probe_senders_ipv6_address_list #

The manual IPv6 senders list of the local Probe. Used only when primary_probe_senders_ipv6_mode is set to Manual or Mask mode.

Example (Manual mode)

[Measurement]
primary_probe_senders_ipv6_address_list/size=1
primary_probe_senders_ipv6_address_list/1/address=fe80:12ab:c839:8df9::1

4.8. secondary_probe_senders_pure_mac_method_enabled #

Determines whether the pure MAC method is used for defining secondary Probe senders. When enabled, the senders are defined only based on MAC addresses and no other senders settings are required for the secondary Probe.

• Values:
  • true - Pure MAC method is used
  • false - Pure MAC method is not used
• Default: false

4.9. secondary_probe_senders_eth_mode #

The Ethernet senders mode of the secondary Probe.

• Values:
  • 0 Auto-search - Use the Ethernet addresses of the device’s interfaces as senders.
  • 249 Manual - Input sender addresses manually.
  • 250 Inverse definition - The senders are defined according to the senders of the secondary Probe.
  • 252 Mask - Define the senders manually by using a network mask instead of individual addresses.
• Default: 250

Example

[Measurement]
secondary_probe_senders_eth_mode=252

4.10. secondary_probe_senders_eth_address_list #

The manual Ethernet senders list of the secondary Probe. Used only when secondary_probe_senders_eth_mode is set to manual or mask.

Example (Mask)

[Measurement]
secondary_probe_senders_eth_address_list/size=1
secondary_probe_senders_eth_address_list/1/address=12:34:56:78:9a:00
secondary_probe_senders_eth_address_list/1/value=ff:ff:ff:ff:ff:00

4.11. secondary_probe_senders_ipv4_mode #

The IPv4 senders mode of the secondary Probe.

• Values:
  • 0 Auto-search - Use the IPv4 addresses of the device’s interfaces as senders.
  • 249 Manual - Input sender addresses manually.
  • 250 Inverse definition - The senders are defined according to the senders of the secondary Probe.
  • 252 Mask - Define the senders manually by using a network mask instead of individual addresses.
• Default: 250

Example

[Measurement]
secondary_probe_senders_ipv4_mode=249

4.12. secondary_probe_senders_ipv4_address_list #

The manual IPv4 senders list of the secondary Probe. Used only when secondary_probe_senders_ipv4_mode is set to Manual or Mask.

Example (Manual)

[Measurement]
secondary_probe_senders_ipv4_address_list/size=3
secondary_probe_senders_ipv4_address_list/1/address=10.0.0.1
secondary_probe_senders_ipv4_address_list/2/address=10.0.0.4
secondary_probe_senders_ipv4_address_list/3/address=10.0.0.12

4.13. secondary_probe_senders_ipv6_mode #

The IPv6 senders mode of the secondary Probe.

• Values:
  • 0 Auto-search - Use the IPv6 addresses of the device’s interfaces as senders.
  • 249 Manual - Input sender addresses manually.
  • 250 Inverse definition - The senders are defined according to the senders of the secondary Probe.
  • 252 Mask - Define the senders manually by using a network mask instead of individual addresses.
• Default: 250

Example

[Measurement]
secondary_probe_senders_ipv6_mode=252

4.14. secondary_probe_senders_ipv6_address_list #

The manual IPv6 senders list of the secondary Probe. Used only when secondary_probe_senders_ipv6_mode is set to Manual or Mask.

Example (Mask)

[Measurement]
secondary_probe_senders_ipv6_address_list/size=1
secondary_probe_senders_ipv6_address_list/1/address=fe80:1234:5678::0
secondary_probe_senders_ipv6_address_list/1/value=ffff:ffff:ffff::0

5. Measurement Details #

5.1. averaging_interval #

Determines how often quality is measured for the ongoing measurement. Lower value gives more detailed results and consumes more resources. A higher value gives smoother values.

• Unit: milliseconds
• Precision: integer
• Minimum: 50
• Default: 1000

Example
To make Scopemon collect quality results twice per second (i.e., every 500 ms), define this parameter as:

[Measurement]
averaging_interval=500

5.2. packet_id_method #

This parameter defines how Probes identify packets during a measurement. The mode Automatic is the recommended one.

See Qosium Scope’s Packet Identification Method for more details of this parameter.

• Values:
  • 10 Automatic - Qosium selects the method from the options below based on the measurement scenario.
  • 50 IPv4 ID Field - Qosium uses the Identification field in the IPv4 header for packet identification.
  • 60 RTP Sequence Number - Qosium uses the Sequence number field in the RTPReal-time Transport Protocol
    A transport protocol for applications with real-time constraints, such as video streams, VoIP, and remote control. header for packet identification.
  • 100 Payload-Based ID - Qosium calculates the identification based on the packet payload. If a packet has no payload, IP4 ID Field, when present, is used.
  • 110 Extended Payload-Based ID - Qosium calculates the identification based on the packet payload, including some parts of the transport layer header.
  • 120 Pure Payload-Based ID - This is a very similar method with Payload-Based ID, but packets without payload are just ignored from QoS calculation.
  • 200 NAT bypasser + Payload based ID - Operates as Payload-Based ID but with NAT bypasser functionality enabled.
  • 210 NAT Bypasser + Pure Payload Based ID - Operates as Pure Payload-Based ID but with NAT bypasser functionality enabled.
• Default: 10

Example

[Measurement]
packet_id_method=50

5.3. packet_loss_timer #

This parameter defines how long to wait for a packet before considering it lost. Thus, selecting a small value may cause delayed packets to be considered lost even though they would later arrive at the destination. The Automatic setup is recommended for most use cases.

• Unit: milliseconds
• Precision: integer
• Special value: 0 - Automatic
• Minimum: 1
• Default: 0

Example
To allow packet delay up to 2 seconds, define this parameter as:

[Measurement]
packet_loss_timer=2000

.

5.4. pk_delay_threshold #

Packets with a delay above this threshold are counted in QoS Statistics: Th. ex. delay pkts.

• Precision: integer
• Unit: microseconds
• Minimum: 0
• Default: 100000

Example
To count packets that have a delay of 500 ms (500000 μs), define this parameter as:

[Measurement]
pk_delay_threshold=500000

5.5. pk_jitter_threshold #

Packets with a jitter above this threshold are counted in QoS Statistics: Th. ex. jitter pkts.

• Precision: integer
• Unit: microseconds
• Minimum: 0
• Default: 100000

Example
To count packets that have a jitter of 100 ms (100000 μs), define this parameter as:

[Measurement]
pk_jitter_threshold=100000

5.6. use_promiscuous_mode #

Promiscuous mode allows the detection of incoming traffic that is not directed to the selected network interface. This scenario is common when capturing mirrored traffic, e.g., from a switch.

• Values:
  • true - Allow detection of all incoming traffic
  • false - Allow detection of incoming traffic destined only for this interface
• Default: true

Example
To disable detection of traffic not designated to the network interface, define this parameter as:

[Measurement]
use_promiscuous_mode=false

6. QoE Averaging #

When using QoE methods, it is recommended to use averaging because it resembles better how humans perceive connection quality.

6.1. use_qoe_swa #

Enable or disable sliding window averaging (SWA) for quality estimates.

• Values:
  • true - Enable SWA
  • false - Disable SWA
• Default: true

Example

[Measurement]
use_qoe_swa=true

6.2. use_qoe_wma #

Enable or disable weighted moving averaging (WMA) for quality estimates.

• Values:
  • true - Enable WMA
  • false - Disable WMA
• Default: true

Example

[Measurement]
use_qoe_wma=false

6.3. qoe_swa_window_size #

SWA window size.

• Precision: Unsigned integer
• Unit: Averaging samples
• Minimum: 0
• Default: 5

Example

[Measurement]
qoe_swa_window_size=2

6.4. qoe_wma_weight_newest #

• Weight of the newest sample in WMA.
• Precision: Real number
  • Minimum: 0.0
  • Default: 0.5

Example

[Measurement]
qoe_wma_weight_newest=1.0

7. Results #

7.1. get_secondary_probe_average_results #

Determines whether single-point average statistics are gathered from the secondary Probe.

• Values:
  • true - Gather average results from the secondary Probe
  • false - Do not gather average results from the secondary Probe
• Default: false

7.2. use_results_distribution #

Enable or disable result distribution directly from primary Probe to external result receivers.

• Values:
  • true - Enable result distribution
  • false - Disable result distribution
• Default: false

7.3. results_distribution_destinations #

Qosium Probe can send measurement results to additional receivers during measurement. These receivers must be running the Qosium server, such as Qosium Storage.

• Type: Array
• Fields:
  • address The IPv4 address of the receiver
  • port The port number of the receiver

Example
To send Qosium results to destinations 127.0.0.1:7700 and 192.168.1.3:7710, define this parameter as:

[Measurement]
use_results_distribution=true
results_distribution_destinations/size=2
results_distribution_destinations/1/address=127.0.0.1
results_distribution_destinations/1/port=7700
results_distribution_destinations/2/address=192.168.1.3
results_distribution_destinations/2/port=7710

7.4. write_absolute_results #

When true, Packet QoS measurement results are written to file. Two files are generated, and the filenames have format pk_qosDL[suffix].txt and pk_qosUL[suffix].txt, and new measurements are appended to the files.

• Values:
  • true - Results are written to files
  • false - Results are not written to files
• Default: false

Example

[Measurement]
write_absolute_results=true

7.5. write_average_results #

When true, average measurement results are written to file. The filename has the format “averages_[suffix].txt”, and new measurements are appended to the file.

• Values:
  • true - Results are written to file
  • false - Results are not written to file
• Default: false

Example

[Measurement]
write_average_results=true

7.6. write_date_code_format #

Date code format governs the frequency of file creation when write_multiple_files. Whenever Scopemon detects a change in the date code, it automatically triggers new result files. A timestamp with this date code is then appended to the filename.

• Type: string
• Default: yyyyMMdd

Example
To write results every hour, define this parameter as:

[Measurement]
write_multiple_files=true
write_date_code_format=yyyyMMdd-hh

7.7. write_filename_suffix #

File suffix string when forming a filename for measurement result files.

• Type: string
• Default: Empty

Example
If defined for example as “test”, filenames will begin with the suffix and underscore, e.g. averages_test.txt.

[Measurement]
write_average_results=true
write_filename_suffix=test

7.8. write_flow_results #

When true, flow measurement results are written to file. The filename has the format “flows_[suffix].txt”, and new measurements are appended to the file. This data only contains flow map detected during the measurement, which starts later than the actual flow. Therefore expect the reported flow duration to be shorter. Typically only one flow should be visible.

• Values:
  • true - Results are written to file
  • false - Results are not written to file
• Default: false

Example

[Measurement]
write_flow_results=true

7.9. write_multiple_files #

When true, measurement results are written to multiple files. By default, one file is created for each day. For configuring multiple file writing frequency, see write_date_code_format.

• Values:
  • true - Results are written to multiple files
  • false - All results are written into a single file
• Default: false

Example

[Measurement]
write_average_results=true
write_flows=true
write_multiple_files=true

7.10. write_packet_results #

When true, packet measurement results are written to file. The filename has the format “pk_info[suffix].txt”, and new measurements are appended to the file.

• Values:
  • true - Results are written to file
  • false - Results are not written to file
• Default: false

Example

[Measurement]
write_packet_results=true

7.11. write_path #

Set to override the path where measurement result files are stored. Use / as the directory separator.

• Type: string
• Default: Scopemon root directory

Example

[Measurement]
write_path=c:/temp

Further Reading