Enabling statistics collection and export:

netflow=1

• 0 or not specified - option disabled
  
• 1 - export statistics by protocol (port numbers); see the section Настройка экспорта NetFlow по протоколам, направлениям и биллингу for details
  
• 2 - export statistics by destination (autonomous system numbers); see the section Настройка экспорта NetFlow по протоколам, направлениям и биллингу for details
  
• 4 - Export statistics for billing; see the section Настройка экспорта NetFlow по протоколам, направлениям и биллингу for details
  
• 8 - Export full session statistics, Full NetFlow in NetFlow v5 or IPFIX format
  

The name of the network interface through which NetFlow statistics will be sent:

netflow_dev=eth2

See the QoE Stor: DPI Configuration section for a configuration example

Data export interval (in seconds):

netflow_timeout=10

The default value is 30 seconds.

Session timeout:

• netflow_passive_timeout — the timeout period (in seconds) for session activity; after this period, if there has been no activity, the session is considered terminated and data is transmitted via it. The default value is 30 seconds.
• netflow_active_timeout — the time (in seconds) after which information is reported for long sessions (i.e., long sessions are effectively broken down into segments of this duration). The default value is 300 seconds.

To smooth out spikes and distribute the load more evenly across the collector, set the configuration parameter

netflow_rate_limit=900

, where 900 is the maximum NetFlow rate in Mbps.
The default value for this parameter is 0 (unlimited).

1. TCP transport protocol.
   The template is sent once after a TCP session is established.
2. UDP transport protocol.
   By default, the template is sent every 20 seconds. This can be adjusted using the ipfix_udp_template_timer parameter.

Specify the IP address and port number of the Full NetFlow collector. You must assign a separate collector to each FastDPI to ensure that the data is not mixed with other statistics:

netflow_full_collector=192.168.0.1:9996

Specify the Full NetFlow export format:

netflow_full_collector_type=2

Possible values:

• 0 - Export in NetFlow5 format (default).
• 1 - Export IPFIX to a UDP collector.
• 2 - Export IPFIX to a TCP collector.

The netflow_plc_stat parameter defines the set of statistics on dropped packets to be transmitted in accordance with policing or drop rules. The parameter is a bit mask.
By default, the mask has the value ‘’0x07‘’—statistics on dropped data for session, subscriber, and virtual channel policing are transmitted.
Affects the calculation of the DROPPED_BYTES and DROPPED_PACKETS counters.
Values used to construct the mask:

• 0xff - any drop is counted
• 0 - do not count
• 1 - count for session-based policing
• 2 - count for subscriber-based policing
• 4 - count for virtual channel policing
• 8 - count when packets are dropped by the protocol
• 16 - count in all other cases

The ipfix_mtu_limit parameter specifies the maximum size of a UDP packet when sending IPFIX. By default, it is set to the minimum MTU size of the interfaces used for transmission.

The parameter tethering_ttl_allowed = 128:64 specifies a list of valid TTL values for traffic from the subscriber that is not considered tethering. Values are separated by a colon ':'. The number of values can be up to 256 (0–255).

In the Netflow v5 format, the original port numbers are retained in the full statistics, and information about the detected protocols is transmitted in the normally unused bytes 46–47. If you need to analyze the protocols in use, you can configure the system so that protocol information is transmitted in the port number:

netflow_full_port_swap=1

For backward compatibility with older collectors, this setting also applies to the IPFIX format; however, using it in conjunction with IPFIX is not recommended, as protocol information is transmitted in IPFIX in a separate, dedicated field.