What is NetFlow used for?
NetFlow solutions are a commonly used standard for monitoring network flow data. Released as a feature on Cisco routers, NetFlow allows you to monitor IP network traffic information as data packets enter or exit an interface.
Is NetFlow still used?
The NetFlow protocol itself has been superseded by Internet Protocol Flow Information eXport (IPFIX).
What is a NetFlow device?
A NetFlow collector or NetFlow traffic analyzer is a reporting server that collects and analyzes traffic data for easier troubleshooting. It’s either a hardware device or a software program.
How does NetFlow work Cisco?
NetFlow is a network protocol system created by Cisco that collects active IP network traffic as it flows in or out of an interface. The NetFlow data is then analyzed to create a picture of network traffic flow and volume — hence the name: NetFlow.
Is NetFlow TCP or UDP?
UDP
The standard or most common UDP port used by NetFlow is UDP port 2055, but other ports, such as 9555, 9995, 9025, and 9026, can also be used. UDP port 4739 is the default port used by IPFIX.
Is NetFlow push or pull?
Similar to SNMP, NetFlow works in a push mode, sending flow records from a cache to a flow collector.
What layer is NetFlow?
The Flexible NetFlow – Layer 2 Fields feature enables collecting statistics for Layer 2 fields such as MAC addresses and virtual LAN (VLAN) IDs from traffic. Perform this task to configure a customized flow record. Customized flow records are used to analyze traffic data for a specific purpose.
Is NetFlow free?
NetFlow Analyzer is a free NetFlow network traffic analyzer and its customizable dashboard enables you to view widgets grouped by devices, interfaces, interface groups, or IP groups, and can also detect network anomalies at a glance.
Does NetFlow use TCP or UDP?
How does NetFlow collect data?
How to Collect NetFlow Data
- Flow exporter: a network device (a router or firewall) in charge of obtaining flow data and exports it to a flow collector.
- Flow collector: a device that collects the exported flow data.
- Flow analyzer: an application that examines and analyses the flow data collected by the flow collector.
What port is NetFlow?
The standard or most common UDP port used by NetFlow is UDP port 2055, but other ports, such as 9555, 9995, 9025, and 9026, can also be used. UDP port 4739 is the default port used by IPFIX.