- Last Updated: Thursday, 08 April 2021 06:12
- Published: Tuesday, 16 July 2013 16:10
- Written by PacketTracerNetwork
What is Netflow?
Netflow is a network analysis protocol that was initially created by Cisco to give the ability to collect detailled informations about network traffic as it flows through a router interface.
The data processed by Netflow collectors provides the network administrator with detailled traffic informations such as the source and destination of the traffic, class of service, .... Netflow version 9 was standardized in 2008 as IPFIX by the IETF organization. This feature is used by network operators for billing network users.
NetFlow records are exported to a Netflow collector using User Datagram Protocol (UDP). The IP address and the destination UDP port of the NetFlow collector have to be configured on the sending device (router or l3 switch). The standard value is UDP port 2055, but other values like 9555 or 9995 can also be used.